exactmatch =
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There are 4082 matches found
| Name | BBrefID | Year | Span | Games | Team | League | Location |
| Ed Abbaticchio | abbati001edw | 1900 | 4/19-8/10 | Minneapolis Millers | American League | Minneapolis, MN | |
| Ed Abbaticchio | abbati001edw | 1900 | 8/16-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Fred Abbott | abbott002har | 1900 | 83 g. | Danville Champions | Central League | Danville, IL | |
| Spencer Abbott | abbott001spe | 1900 | 33 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Spencer Abbott | abbott001spe | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Victor Accorsini | accors001vic | 1900 | 4/30-6/11 | Elmira | Atlantic League | Elmira, NY | |
| Victor Accorsini | accors001vic | 1900 | 7/30-8/18 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Adams | adams-061--- | 1900 | 5 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Adams | adams-034--- | 1900 | 2 g. | Stockton Wasps | California League | Stockton, CA | |
| Adams | 1900 | Williams College | College | , | |||
| J.J. Adams | adams-021--- | 1900 | 5/1-6/26 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Jim Adams | adams-001jim | 1900 | 7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Jim Adams | adams-001jim | 1900 | Umpire | Virginia League | , | ||
| Merle Adkins | adkins001mer | 1900 | Beloit College | College | , | ||
| Merle Adkins | adkins001mer | 1900 | no g. | Milwaukee Brewers | American League | Milwaukee, WI | |
| Merle Adkins | adkins001mer | 1900 | Chataugua NY | Independent | Chataugua, NY | ||
| Jay Adritz | adritz001jay | 1900 | Albany Senators | New York State League | Albany, NY | ||
| Pete Agnew | agnew-001pet | 1900 | Chester | Independent | Chester, PA | ||
| Abe Akers | akers-001abe | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Doc Aldinger | alding001alb | 1900 | Bloomsburg College | College | , | ||
| Doc Aldinger | alding001alb | 1900 | 5/23 | Elmira | Atlantic League | Elmira, NY | |
| Doc Aldinger | alding001alb | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| Bill Alexander | alexan005wil | 1900 | no g. | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Bill Alexander | alexan005wil | 1900 | no g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Harry Allemang | allema001har | 1900 | Ottumwa IA | Independent | Ottumwa, IA | ||
| Harry Allemang | allema001har | 1900 | Massillon OH | Independent | Massillon, OH | ||
| Harry Allemang | allema001har | 1900 | 7/11-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Harry Allemang | allema001har | 1900 | 8/6-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Bob Allen | allen-001bob | 1900 | 4/21-6/1 | 5 g. | Cincinnati | National League | Cincinnati, OH |
| Charles Allen | 1900 | Greenville | Independent | Greenville, PA | |||
| George Allen | allen-003geo | 1900 | 4/30-6/22 | Hampton Crabs | Virginia League | Hampton, VA | |
| George Allen | allen-003geo | 1900 | 6/26-7/11 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| George Allen | allen-003geo | 1900 | 7/17-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Murray Allen | allen-000mur | 1900 | 6/25-7/9+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Tom Allison | alliso000tom | 1900 | U. North Carolina | , | |||
| Tom Allison | alliso000tom | 1900 | 6/27-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Arthur Alloway | allowa001art | 1900 | 4/28-9/19 | Toronto Canucks | Eastern League | Toronto, ON | |
| Nick Altrock | altroc001nic | 1900 | 4/26-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Burton Ambrose | ambros001--- | 1900 | -6/14 | Utica Reds | New York State League | Utica, NY | |
| Burton Ambrose | ambros001--- | 1900 | Potsdam | Northern New York League | Potsdam, NY | ||
| Ames | ames--003--- | 1900 | 1 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Ed Ames | ames--001edw | 1900 | 5/2-5/29 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Ed Ames | ames--001edw | 1900 | 6/6-9/11 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Doc Amole | amole-001doc | 1900 | 4/19-9/15 | Buffalo Bisons | American League | Buffalo, NY | |
| Anderson | anders030--- | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Andy Anderson | anders003and | 1900 | 5/5-7/22 | Pueblo Indians | Western League | Pueblo, CO | |
| Andy Anderson | anders003and | 1900 | -9/23 | 14 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Andy Anderson | anders003art | 1900 | Panerville OH | Independent | Panerville, OH | ||
| John Anderson | anders010joh | 1900 | 4/21-9/17 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Smylie Anderson | anders001s-- | 1900 | Tulane Univ | College | , | ||
| Smylie Anderson | anders001s-- | 1900 | Crystal Sprs MS | Independent | Crystal Sprs, MS | ||
| Smylie Anderson | anders001s-- | 1900 | Memphis | Independent | Memphis, TN | ||
| Spike Anderson | anders003a-- | 1900 | U. Minnesota | College | , | ||
| Spike Anderson | anders003a-- | 1900 | Aberdeen | Independent | Aberdeen, SD | ||
| Spike Anderson | anders003a-- | 1900 | Sioux Falls | Independent | Sioux Falls, SD | ||
| Steve Anderson | anders011ste | 1900 | Trinity Col. (Duke)College | , | |||
| Steve Anderson | anders011ste | 1900 | 6/25-7/21+ | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Steve Anderson | anders011ste | 1900 | +7/27+ | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Doc Andrews | andrew001jay | 1900 | 4/19-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| George Andrews | andrew005geo | 1900 | 5/5-6/23 | Pueblo Indians | Western League | Pueblo, CO | |
| Fred Applegate | appleg002fre | 1900 | Wmpt Store | Independent | , | ||
| Alfredo Arcano | arcano000alf | 1900 | Habana | Cuban League | , | ||
| Abe Arellanes | arella001abe | 1900 | -12/2 | 60 g. | Oakland Oaks | California League | Oakland, CA |
| Esteban Aristi | aristi000est | 1900 | Habana | Cuban League | , | ||
| Bill Armour | armour001wil | 1900 | 4/28-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| Frank Armstrong | armstr001fra | 1900 | 4/30-7/7 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Lou Armstrong | armstr001lou | 1900 | -9/23 | 21 g. | Helena Senators | Montana State League | Helena, MT |
| Harry Arndt | arndt-001har | 1900 | 7/21-7/23 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Harry Arndt | arndt-001har | 1900 | +8/14+ | South Bend | Independent | South Bend, IN | |
| Arnesen | arnese001--- | 1900 | 7 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Arnheim | arnhei000--- | 1900 | 6/26- | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Arnheim | arnhei000--- | 1900 | +7/4-8/1+ | Tarb.-Juniors | Independent | Tarboro, NC | |
| Ed Arthur | arthur002sta | 1900 | 4/28-9/15 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Ernie Asbury | asbury001ern | 1900 | +7/29+ | SLC-Short Line RR | Independent | , | |
| Steve Ashe | ashe--001ste | 1900 | 5/10-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Ed Ashenbach | ashenb001edw | 1900 | 4/30-7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Ed Ashenbach | ashenb001edw | 1900 | 7/31-8/12 | Umpire | New York State League | , | |
| Ed Ashenbach | ashenb001edw | 1900 | 8/13-8/18 | Troy Washerwomen | New York State League | Troy, NY | |
| Henry Ashford | ashfor001hen | 1900 | U. No. Carolina | College | , | ||
| Jack Ashton | ashton001joh | 1900 | Sterling IL | Independent | Sterling, IL | ||
| Askew | askew-004--- | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Ernest Atchison | atchis000ern | 1900 | Wash.DC-YMCA | Independent | Washington, DC | ||
| Ernest Atchison | atchis000ern | 1900 | 7/13-7/27+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Charlie Atherton | athert001cha | 1900 | 6/14-8/5 | Buffalo Bisons | American League | Buffalo, NY | |
| Jake Atz | atz---001joh | 1900 | 5/11-5/20+ | Troy Washerwomen | New York State League | Troy, NY | |
| Jake Atz | atz---001joh | 1900 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | ||
| Alberto Azoy | azoy--000alb | 1900 | Habana | Cuban League | , | ||
| Charlie Babb | babb--001cha | 1900 | 4/28-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Babbit | 1900 | Newport News Shipbuilders | Virginia League | Newport News, VA | |||
| George Babbitt | babbit002geo | 1900 | 4/1-12/2 | Stockton Wasps | California League | Stockton, CA | |
| Harry Bacon | bacon-001har | 1900 | Bowdoin College | College | , | ||
| Louis Bacon | bacon-001jam | 1900 | 5/11-6/? | Binghamton Crickets | New York State League | Binghamton, NY | |
| W.H. Bacon | bacon-000wh- | 1900 | +6/6+ | Brown University | College | , | |
| W.H. Bacon | bacon-000wh- | 1900 | +7/2-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Bacon??? | 1900 | 28 g. | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Frank Badger | badger001fra | 1900 | 95 g. | Decatur Commodores | Central League | Decatur, IL | |
| Will Baer | baer--001wil | 1900 | 5/5-6/25 | Omaha Omahogs | Western League | Omaha, NE | |
| Will Baer | baer--001wil | 1900 | 7/4-8/9 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Will Baer | baer--001wil | 1900 | 8/28-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Jose Baeza | baeza-000jos | 1900 | Cubano | Cuban League | , | ||
| Jack Bagley | bagley001joh | 1900 | 6/4 | New London Whalers | Connecticut State League | New London, CT | |
| Jack Bagley | bagley001joh | 1900 | +7/7-7/11+ | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Jack Bagley | bagley001joh | 1900 | 8/22-8/30 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Harvey Bailey | bailey003har | 1900 | 4/19-5/21 | 4 g. | Boston | National League | Boston, MA |
| Harvey Bailey | bailey003har | 1900 | 6/2-9/16 | Minneapolis Millers | American League | Minneapolis, MN | |
| King Bailey | bailey001kin | 1900 | Albany Senators | New York State League | Albany, NY | ||
| James Baird | baird-001jam | 1900 | 48 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| James Baird | baird-001jam | 1900 | Danville Champions | Central League | Danville, IL | ||
| James Baird | baird-001jam | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| James Baird | baird-001jam | 1900 | 7/25-9/1 | Omaha Omahogs | Western League | Omaha, NE | |
| Baker | baker-047--- | 1900 | Schenectady Electricians | New York State League | Schenectady, NY | ||
| Baker | baker-022--- | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Bock Baker | baker-002cha | 1900 | 4/24-5/9 | Buffalo Bisons | American League | Buffalo, NY | |
| Bock Baker | baker-002cha | 1900 | 5/12-5/28 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Bock Baker | baker-002cha | 1900 | 5/30-7/15 | Buffalo Bisons | American League | Buffalo, NY | |
| Bock Baker | baker-002cha | 1900 | 7/27-9/16 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Fred Baker | baker-003fre | 1900 | 5/11-6/4 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Kirtley Baker | baker-001kir | 1900 | 5/4 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Felix Balcolm | 1900 | no g. | Bristol Bellmakers | Connecticut State League | Bristol, CT | ||
| Billy Baldwin | baldwi000bil | 1900 | Ogdensburg | Northern New York League | Ogdensburg, NY | ||
| Art Ball | ball--003art | 1900 | 5/5-9/4 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Neil Ball | ball--001nei | 1900 | +5/6/-6/6+ | Kokomo | Indiana State League | Kokomo, IN | |
| Dad Ballagh | 1900 | 2 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Ballard | 1900 | 6/25- | Durham Bulls | North Carolina Association | Durham, NC | ||
| Joseph Bammert | bammer001joh | 1900 | 4/30-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Joseph Bammert | bammer001joh | 1900 | 37 g. | Decatur Commodores | Central League | Decatur, IL | |
| Oscar Bandelin | bandel002osc | 1900 | Hamline Univ. | College | , | ||
| Oscar Bandelin | bandel002osc | 1900 | 6/14-6/17 | Minneapolis Millers | American League | Minneapolis, MN | |
| Oscar Bandelin | bandel002osc | 1900 | Aberdeen | Independent | Aberdeen, SD | ||
| Oscar Bandelin | bandel002osc | 1900 | Sioux Falls | Independent | Sioux Falls, SD | ||
| Oscar Bandelin | bandel002osc | 1900 | 8/14-9/14 | Minneapolis Millers | American League | Minneapolis, MN | |
| Banks | banks-009--- | 1900 | +7/18-7/27+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| R. E. Bankston | bankst003--- | 1900 | +5/9-5/28+ | Wabash | Indiana State League | Elwood, IN | |
| George Bannon | bannon001geo | 1900 | 4/27-5/22 | Syracuse Stars | Eastern League | Syracuse, NY | |
| George Bannon | bannon001geo | 1900 | -7/28 | 27 g. | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY |
| George Bannon | bannon001geo | 1900 | 7/30-9/18 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Jimmy Bannon | bannon001jam | 1900 | 4/28-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Tom Bannon | bannon001tho | 1900 | 4/26-7/15 | Montreal Royals | Eastern League | Montreal, QC | |
| Tom Bannon | bannon001tho | 1900 | 7/20-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Billy Barber | barber001wil | 1900 | no g. | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Dave Barber | barber001dav | 1900 | 5/1- | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Dave Barber | barber001dav | 1900 | -6/7 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Dave Barber | barber001dav | 1900 | -9/8 | 60 g. | Utica Reds | New York State League | Utica, NY |
| Frank Barber | barber001fra | 1900 | +8/14+ | Muskegon Reds | Independent | Muskegon, MI | |
| George Barclay | barcla001geo | 1900 | no g. | Rochester Bronchos | Eastern League | Rochester, NY | |
| George Barclay | barcla001geo | 1900 | Phil.-Crescents | Independent | Philadelphia, PA | ||
| Sandy Barclay | barcla001san | 1900 | 7 g. | San Diego | Southern California League | San Diego, CA | |
| Charley Bare | 1900 | 15 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| John Bare | bare--001joh | 1900 | 13 g. | Visalia | San Joaquin | Visalia, CA | |
| Fred Barnes | barnes001fre | 1900 | 4/25-9/1 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Jack Barnett | barnet003joh | 1900 | 5/15-6/8 | Elmira | Atlantic League | Elmira, NY | |
| Billy Barnie | barnie001bil | 1900 | 4/26-7/15 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Barnwell | 1900 | Yale Univ. | College | , | |||
| Alfredo Baro | baro--000alf | 1900 | San Francisco | Cuban League | , | ||
| Barrett | barret003--- | 1900 | 5/11 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Jimmy Barrett | barret003jam | 1900 | 4/19-10/14 | 137 g. | Cincinnati | National League | Cincinnati, OH |
| Robert Barrett | barret004rob | 1900 | 5/24-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Ed Barrow | barrow001edw | 1900 | 4/26-9/23 | Toronto Canucks | Eastern League | Toronto, ON | |
| Barry | barry-002--- | 1900 | 5/20-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Jimmy Barry | barry-002jam | 1900 | 5/14-5/31 | Derby Angels | Connecticut State League | Derby, CT | |
| John Barry | barry-002joh | 1900 | 4/19-10/13 | 81 g. | Boston | National League | Boston, MA |
| John Barry | barry-002joh | 1900 | 6/21 | Montreal Royals | Eastern League | Montreal, QC | |
| W.T. Bartlett | bartle000wt- | 1900 | Maryville College | College | , | ||
| W.T. Bartlett | bartle000wt- | 1900 | 6/27-8/1 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| W.T. Bartlett | bartle000wt- | 1900 | 8/-8/ | Rome GA | Independent | Rome, GA | |
| Harry Barton | barton001har | 1900 | Muncie | Independent | Muncie, PA | ||
| Sherman Barton | barton000she | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Jimmy Bass | bass--001jam | 1900 | 5/11-6/9 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Jimmy Bass | bass--001jam | 1900 | 6/25-7/19+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Frank Bates | bates-002fra | 1900 | 5/11-6/30 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Frank Bates | bates-002fra | 1900 | 7/16-7/29 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Frank Bates | bates-002fra | 1900 | 8/7-9/5 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Larry Battam | battam001lar | 1900 | 4/30- | Jersey City City | Atlantic League | Jersey City, NJ | |
| Larry Battam | battam001lar | 1900 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | ||
| Larry Battam | battam001lar | 1900 | -6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Larry Battam | battam001lar | 1900 | 7/31-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Battise | battis002--- | 1900 | 1 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| William Battle | battle001wil | 1900 | U. No. Carolina | College | , | ||
| William Battle | battle001wil | 1900 | 6/25-7.17+ | Wilmington | North Carolina Association | Wilmington, NC | |
| Baumert | 1900 | 4/30- | Portsmouth Boers | Virginia League | Portsmouth, VA | ||
| Harry Bay | bay---001har | 1900 | 4/19-5/7 | Detroit Tigers | American League | Detroit, MI | |
| Harry Bay | bay---001har | 1900 | 5/14-6/11 | Elmira | Atlantic League | Elmira, NY | |
| Harry Bay | bay---001har | 1900 | 6/17-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Harry Bay | bay---001har | 1900 | 8/5-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Burley Bayer | bayer-001bur | 1900 | 70 g. | Peoria Distillers | Central League | Peoria, IL | |
| Burley Bayer | bayer-001bur | 1900 | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| Fred Beach | beach-000fre | 1900 | Potsdam | Northern New York League | Potsdam, NY | ||
| Edward Beadle | beadle001edw | 1900 | -10/14 | Canton | Independent | Canton, OH | |
| Carl Beal | beal--001car | 1900 | 29 g. | Danville Champions | Central League | Danville, IL | |
| A. B. Beall | 1900 | Sioux City Cornhuskers | Western League | Sioux City, IA | |||
| Charles Beam | beam--002cha | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Ernie Beam | beam--001ern | 1900 | 5/18-6/6 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Joe Bean | bean--001jos | 1900 | 5/4-7/31 | Worcester Farmers | Eastern League | Worcester, MA | |
| Joe Bean | bean--001jos | 1900 | 8/3-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Charlie Beard | 1900 | 1 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Ben Beaumont | beaumo001ben | 1900 | 4/30- | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Ben Beaumont | beaumo001ben | 1900 | -6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Ben Beaumont | beaumo001ben | 1900 | 6/23-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Frank Beaumont | beaumo001fra | 1900 | North Adams | Independent | North Adams, MA | ||
| Ginger Beaumont | beaumo001cla | 1900 | 4/19-10/13 | 138 g. | Pittsburgh | National League | Pittsburgh, PA |
| Beck | beck--002--- | 1900 | 1 g. | Danville Champions | Central League | Danville, IL | |
| Beck | 1900 | 5/24-6/6 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | ||
| Erve Beck | beck--001erv | 1900 | 4/28-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Harry Beck | beck--013--- | 1900 | +5/9-5/10+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Arthur Becker | becker002art | 1900 | Evansv.- | EvanCourier | Evansville, IN | ||
| Bob Becker | becker001bob | 1900 | 5/5-5/30 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Jake Beckley | beckle001jac | 1900 | 4/19-10/14 | 141 g. | Cincinnati | National League | Cincinnati, OH |
| Arthur Beebe | beebe-001art | 1900 | Sacramento Gilt Edges | California League | Sacramento, CA | ||
| Fred Beebe | beebe-001fre | 1900-01 | Chic.-Hyde Park | High School | , | ||
| Charles Beecher | beeche001cha | 1900 | Binghamton Crickets | New York State League | Binghamton, NY | ||
| Charles Beecher | beeche001cha | 1900 | Memphis | Independent | Memphis, TN | ||
| William Beeker | beeker001wil | 1900 | +5/17-6/6+ | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Frank Behne | behne-002fra | 1900 | 4/30-5/5 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Ira Belden | belden002ira | 1900 | 4/28-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Wallace Belding | beldin000wal | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Espy Bell | 1900 | -10/14 | Canton | Independent | Canton, OH | ||
| William Bell | bell--006wil | 1900 | Cuban Giants | Black Baseball | , | ||
| Frank Belt | belt--001fra | 1900 | 4/28-7/17 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Harry Bemis | bemis-001har | 1900 | 4/30-5/6 | Newark Colts | Atlantic League | Newark, NJ | |
| Harry Bemis | bemis-001har | 1900 | 5/11-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Prudencio Benavides | benavi000pru | 1900 | San Francisco | Cuban League | , | ||
| Bender | bender001--- | 1900 | Rich.-Jimplecote | Independent | Richmond, VA | ||
| Bender | bender001--- | 1900 | 6/11-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| John Bender | bender001joh | 1900-04 | Univ. Nebraska | College | , | ||
| Bennett | bennet041--- | 1900 | 1 g. | Helena Senators | Montana State League | Helena, MT | |
| Frank Bennett | bennet003fra | 1900 | Ogdensburg | Northern New York League | Ogdensburg, NY | ||
| J.T. Bennett | bennet000jt- | 1900 | U. No. Carolina | College | , | ||
| J.T. Bennett | bennet000jt- | 1900 | Oak Ridge NC | Independent | Oak Ridge, NC | ||
| J.T. Bennett | bennet000jt- | 1900 | 6/25-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| J.T. Bennett | bennet000jt- | 1900 | +7/3= | Statesville | North Carolina Association | Statesville, NC | |
| Pug Bennett | bennet001jus | 1900 | 8/20-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Pat Bentley | bentle004joh | 1900 | 7/2-8/31 | Ogdensburg | Northern New York League | Ogdensburg, NY | |
| Phil Berg | berg--001phi | 1900 | 5/30+ | Kokomo | Indiana State League | Kokomo, IN | |
| Bill Bergen | bergen001wil | 1900 | 4/28-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| W.H. Berkshire | berksh001w-- | 1900 | 5/12-5/16 | Derby Angels | Connecticut State League | Derby, CT | |
| Curt Bernard | bernar001cur | 1900 | 5/11-9/8 | Albany Senators | New York State League | Albany, NY | |
| Curt Bernard | bernar001cur | 1900 | 9/17-10/13 | 20 g. | New York | National League | New York, NY |
| Bill Bernhard | bernha001wil | 1900 | 4/19-10/13 | 32 g. | Philadelphia | National League | Philadelphia, PA |
| Harry Bernstein | bernst001har | 1900 | 6/28-7/5 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Hodge Berry | berry-000hod | 1900 | no g. | Pueblo Indians | Western League | Pueblo, CO | |
| Hodge Berry | berry-000hod | 1900 | -10/14 | Canton | Independent | Canton, OH | |
| Bob Berryhill | berryh001rob | 1900 | 4/30- | Jersey City City | Atlantic League | Jersey City, NJ | |
| Bob Berryhill | berryh001rob | 1900 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | ||
| Bob Berryhill | berryh001rob | 1900 | -6/9 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Bob Berryhill | berryh001rob | 1900 | 6/11-6/30 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Harry Berte | berte-001har | 1900 | 4/30-6/9 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Harry Berte | berte-001har | 1900 | 6/12-6/21 | Toronto Canucks | Eastern League | Toronto, ON | |
| Harry Berte | berte-001har | 1900 | 6/29-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Conrad Best | best--001con | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Conrad Best | best--001con | 1900 | Schenectady Electricians | New York State League | Schenectady, NY | ||
| Conrad Best | best--001con | 1900 | 5/29-7/4 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Conrad Best | best--001con | 1900 | Umpire | Connecticut State League | , | ||
| Conrad Best | best--001con | 1900 | 8/13-8/28+ | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Fred Betts | betts-001fre | 1900 | +5/12-9/8 | Utica Reds | New York State League | Utica, NY | |
| Carlton Beusse | beusse001car | 1900 | Athens | Independent | Athens, GA | ||
| Fred Beusse | 1900 | Athens | Independent | Athens, GA | |||
| Bevans | bevans004--- | 1900 | 7/13-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Frank Bevans | bevans001fra | 1900 | Baltimore YMCA | Independent | Baltimore, MD | ||
| Frank Bevans | bevans001fra | 1900 | 5/30-7/4+ | Baltimore Walbrooks | Suburban | Baltimore, MD | |
| Ben Beville | bevill001cla | 1900 | +4/8- | 17 g. | Oakland Oaks | California League | Oakland, CA |
| Ben Beville | bevill001cla | 1900 | -9/23 | 21 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Monte Beville | bevill001hen | 1900 | 4/28-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Monte Beville | bevill001hen | 1900 | 8/24-9/9 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Monte Beville | bevill001hen | 1900 | 9/10-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Roy Bevis | bevis-001roy | 1900 | +7/18+ | Winfield Reds | Independent | Winfield, KS | |
| Ed Biecher | bieche001ed- | 1900 | 4/28-7/18 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Lou Bierbauer | bierba002lou | 1900 | 4/20-6/16 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Lou Bierbauer | bierba002lou | 1900 | 6/18-8/9 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Lou Bierbauer | bierba002lou | 1900 | 8/11-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| George Bigbie | bigbie001geo | 1900 | 5/1-5/3 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| George Bigbie | bigbie001geo | 1900 | 5/7-7/10+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Arthur Bigelow | bigelo002--- | 1900 | +5/25+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Arthur Bigelow | bigelo002--- | 1900 | 2 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| William Billings | billin001wil | 1900 | 5/22- | 19 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| George Bindloss | bindlo001geo | 1900 | New London Whalers | Connecticut State League | New London, CT | ||
| Bill Binga | binga-001wil | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Joe Birmingham | birmin001jos | 1900 | Elmi.-FatherMathew | Independent | Elmira, NY | ||
| Joe Birmingham | birmin001jos | 1900 | Notre Dame University | College | , | ||
| Mike Birmingham | birmin001mic | 1900 | 5/11-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Bishop | bishop013--- | 1900 | 7/10 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| John Bishop | bishop001joh | 1900 | 4/28-7/31 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Wilbert Bissell | bissel001wil | 1900 | preseason | Denver Grizzlies | Western League | Denver, CO | |
| Wilbert Bissell | bissel001wil | 1900 | 5/22- | 70 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| George Black | black-001geo | 1900 | 5/18-7/4 | Chatham Reds | International League | Chatham, ON | |
| George Blackburn | blackb001geo | 1900 | 5/6-7/4 | Pueblo Indians | Western League | Pueblo, CO | |
| Ross Blackwell | 1900 | Denver Grizzlies | Western League | Denver, CO | |||
| Harry Blake | blake-001har | 1900 | 4/26-8/20 | Worcester Farmers | Eastern League | Worcester, MA | |
| Frank Blanford | blanfo000fra | 1900 | +6/4+ | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Frank Blanford | blanfo000fra | 1900 | +7/30+ | Sioux Falls | Independent | Sioux Falls, SD | |
| Blankenship | blanke008--- | 1900 | +3/23-5/12+ | Trinity Col. (Duke) | College | , | |
| Blankenship | blanke008--- | 1900 | SelmaNC | Independent | Selma, NC | ||
| Blankenship | blanke008--- | 1900 | 6/25-7/9+ | Durham Bulls | North Carolina Association | Durham, NC | |
| Bob Blewett | blewet001rob | 1900 | Georgetown U. | Independent | Georgetown, | ||
| Bob Blewett | blewet001rob | 1900 | no g. | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Bob Blewett | blewet001rob | 1900 | Sioux Falls | Independent | Sioux Falls, SD | ||
| Bob Blewett | blewet001rob | 1900 | Idaho Falls SD | Independent | Idaho Falls, SD | ||
| Fred Bluth | bluth-001god | 1900 | +6/3+ | Ogden | Independent | Ogden, UT | |
| Jack Bodie | bodie-001joh | 1900 | 2 g. | Stockton Wasps | California League | Stockton, CA | |
| Joe Boever | boever002jos | 1900 | Kokomo | Indiana State League | Kokomo, IN | ||
| Boisseau | boisse001--- | 1900 | Rich.-Jimplecote | Independent | Richmond, VA | ||
| Boisseau | boisse001--- | 1900 | 6/11-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Edward Boland | boland002edw | 1900 | 2 g. | Danville Champions | Central League | Danville, IL | |
| Edward Boland | boland002edw | 1900 | Umpire | Central League | , | ||
| George Bone | bone--001geo | 1900 | 5/10-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Frank Bonner | bonner001fra | 1900 | 4/26-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Jack Bonner | bonner001joh | 1900 | Villanova Col. | College | , | ||
| Jack Bonner | bonner001joh | 1900 | Chester | Independent | Chester, PA | ||
| William Bopst | bopst-001wil | 1900 | 5/23-6/13 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| George Borchers | borche001geo | 1900 | 37 g. | Oakland Oaks | California League | Oakland, CA | |
| George Borchers | borche001geo | 1900 | 9 g. | Visalia | San Joaquin | Visalia, CA | |
| Billy Bottenus | botten001wil | 1900 | 4/30-6/9 | Elmira | Atlantic League | Elmira, NY | |
| Billy Bottenus | botten001wil | 1900 | 8/1-9/18 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Joe Boucher | bouche001jos | 1900 | 5/29-6/2 | Umpire | Virginia League | , | |
| Joe Boucher | bouche001jos | 1900 | 6/4-6/6 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Joe Boucher | bouche001jos | 1900 | 6/7 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Jim Bouldin | bouldi001jam | 1900 | Ellsworth KS | Independent | Ellsworth, KS | ||
| Jim Bouldin | bouldi001jam | 1900 | +8/2+ | Concordia KS | Independent | Concordia, KS | |
| Cy Bowen | bowen-001sut | 1900 | 5/2-9/13 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Jack Bowen | bowen-003jac | 1900 | 94 g. | Danville Champions | Central League | Danville, IL | |
| Mickey Bowen | bowen-001--- | 1900 | 5/12-5/21,7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Mickey Bowen | bowen-001--- | 1900 | 5/22-6/10 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Frank Bowerman | bowerm001fra | 1900 | 5/2-10/12 | 80 g. | New York | National League | New York, NY |
| Bill Bowman | bowman001bil | 1900 | no g. | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Frank Bowman | bowman001fra | 1900 | -12/2 | 52 g. | Oakland Oaks | California League | Oakland, CA |
| Sumner Bowman | bowman001sum | 1900 | , | ||||
| W.H. Bowman | bowman001w-- | 1900 | 7 g. | San Diego | Southern California League | San Diego, CA | |
| Boyd | boyd--002--- | 1900 | 5/10-5/14 | Chatham Reds | International League | Chatham, ON | |
| Frank Boyd | boyd--002fra | 1900 | 4/30-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Charles Boyers | boyer-001cha | 1900 | 4/30-6/2 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Charles Boyle | boyle-001cha | 1900 | 5/1-6/9 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Eddie Boyle | boyle-001edd | 1900 | Athens | Independent | Athens, GA | ||
| Paddy Boyle | boyle-001pad | 1900 | 5/11-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Paddy Boyle | boyle-001pad | 1900 | 7/2-7/16 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| George Bradford | bradfo001geo | 1900 | 5/10-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| George Bradford | bradfo001geo | 1900 | 7/10-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| Bill Bradley | bradle004wil | 1900 | 4/30-10/13 | 122 g. | Chicago | National League | Chicago, IL |
| Edward Bradley | bradle001edw | 1900 | 4/28-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Edward Bradley | bradle001edw | 1900 | 8/24-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| G.W. Bradley | bradle001g-- | 1900 | Asbury Park | Independent | Asbury Park, NJ | ||
| Jerome Bradley | 1900 | Georgetown | College | , | |||
| George Brady | brady-001geo | 1900 | 80 g. | Decatur Commodores | Central League | Decatur, IL | |
| Dick Braggins | braggi001ric | 1900 | 8/13-9/17 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Dave Brain | brain-001dav | 1900 | 5/5-9/3 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Dave Brain | brain-001dav | 1900 | 9/11-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Brandimore | brandi001--- | 1900 | 5/10-5/16 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Willie Brandt | brandt002wil | 1900 | 4/27-5/1 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Willie Brandt | brandt002wil | 1900 | 7/28-7/31 | Hagerstown | Cumberland Valley | Hagerstown, MD | |
| Kitty Bransfield | bransf001wil | 1900 | 4/26-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Kitty Brashear | brashe001nor | 1900 | 4/29-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Roy Brashear | brashe002roy | 1900 | 5/5-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Howard Bratton | bratto001how | 1900 | 6/5-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Howard Bratton | bratto001how | 1900 | Attleboro | Independent | Attleboro, MA | ||
| Silver Braun | braun-005wil | 1900 | 4/26-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Edwin Breckenridge | brecke002edw | 1900 | Amherst College | College | , | ||
| Jimmie Breen | breen-002jam | 1900 | 4/28-6/23 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Theodore Breitenstein | breite001the | 1900 | 4/21-10/07 | 41 g. | Cincinnati | National League | Cincinnati, OH |
| Theodore Breitenstein | breite001the | 1900 | 7/2-8/6 | MLB Umpire | National League | , | |
| O. Brekke | 1900 | +5/25+ | Buxton | Independent | Buxton, ND | ||
| Robin Brem | brem--000rob | 1900 | Salisbury NC | Independent | Salisbury, NC | ||
| Robin Brem | brem--000rob | 1900 | 7/2-7/5 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Frank Brenig | brenig000fra | 1900 | +7/6+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| J.C. Brennan | brenna004j-- | 1900 | 9/6 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| J.C. Brennan | brenna004j-- | 1900 | 6/19 | Norwich Witches | Connecticut State League | Norwich, CT | |
| J.C. Brennan | brenna004j-- | 1900 | 6/26-6/29 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Jack Brennan | brenna005joh | 1900 | 5/24 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Jack Brennan | brenna005joh | 1900 | +6/3+ | Chicago Whiting | Independent | Chicago, IL | |
| Maurice Brennan | brenna001mau | 1900 | 5/30 | New London Whalers | Connecticut State League | New London, CT | |
| Alex Brenner | bremme002--- | 1900 | +5/6--5/25+ | Muncie | Indiana State League | Muncie, IN | |
| Breslin | bresli002--- | 1900 | 5/20-5/22 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Roger Bresnahan | bresna001rog | 1900 | Manistee MI | Independent | Manistee, MI | ||
| Roger Bresnahan | bresna001rog | 1900 | 8/31 | 2 g. | Chicago | National League | Chicago, IL |
| Buttons Briggs | briggs001her | 1900 | 5/10-5/24 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Albert Briseno | brisen001alb | 1900 | 15 g. | Hanford | San Joaquin | Hanford, CA | |
| Roger Brisifahon | 1900 | Denver Grizzlies | Western League | Denver, CO | |||
| George Bristow | bristo002geo | 1900 | 5/5-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Albert Brittan | britta001alb | 1900 | 2 g. | Fresno | San Joaquin | Fresno, CA | |
| Broad | 1900 | 14 g. | Fresno | San Joaquin | Fresno, CA | ||
| Billy Brockhoff | brockh001wil | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Charlie Brockway | brockw000cha | 1900 | 5/29-5/30 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Ed Brockwell | brockw000ed- | 1900 | 5/29-5/30 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Ed Brockwell | brockw000ed- | 1900 | 6/25-7/10+ | Durham Bulls | North Carolina Association | Durham, NC | |
| Matt Broderick | broder001mat | 1900 | 5/21-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Matt Broderick | broder001mat | 1900 | 7/10-7/21 | Hamilton Hams | International League | Hamilton, ON | |
| Matt Broderick | broder001mat | 1900 | 8/6-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| Jim Brodie | brodie001jim | 1900 | 7/20-9/8 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Steve Brodie | brodie001wal | 1900 | 5/1-7/23 | Chicago White Stockings | American League | Chicago, IL | |
| George Brooks | brooks001geo | 1900 | U. of Maryland | College | , | ||
| George Brooks | brooks001geo | 1900 | 46 g. | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Joseph Brooks | brooks003j-- | 1900 | Rich.-Jimplecote | Independent | Richmond, VA | ||
| Joseph Brooks | brooks003j-- | 1900 | 6/8-6/12 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Andy Brophy | brophy001and | 1900 | +7/26+ | Clear Fork KS | Independent | Clearr Fork, KS | |
| Frank Brosier | brosie000fra | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Brown | brown-029--- | 1900 | 7/31 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Brown | brown-286--- | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Brown | brown-286--- | 1900 | Cuban Giants | Black Baseball | , | ||
| Bob Brown | brown-027rob | 1900 | 5/22- | 56 g. | Helena Senators | Montana State League | Helena, MT |
| Dick Brown | brown-001ric | 1900 | Cedar Rapids | Cedar Rapids, IA | |||
| Dick Brown | brown-001ric | 1900 | 87 g. | Peoria Distillers | Central League | Peoria, IL | |
| Dick Brown | brown-001ric | 1900 | Bloomington Blues | Central League | Bloomington, IL | ||
| Fred Brown | brown-004fre | 1900 | Dartmouth Col. | College | , | ||
| Fred Brown | brown-004fre | 1900 | 4/30-5/29 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Fred Brown | brown-004fre | 1900 | 4/30-5/29 | Jersey City City | Atlantic League | Jersey City, NJ | |
| James Brown | brown-003jam | 1900 | 6/28-9/6 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| James Brown | brown-003jam | 1900 | 9/8-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| John Brown | brown-018joh | 1900 | , | ||||
| John Brown | brown-103--- | 1900 | +5/11-5/23+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| John Brown | brown-103--- | 1900 | +6/8 | Muncie | Indiana State League | Muncie, IN | |
| W.A. Brown | brown-005w-- | 1900 | 5/10-5/16 | New London Whalers | Connecticut State League | New London, CT | |
| George Browne | browne001geo | 1900 | +5/14-7/8 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| George Browne | browne001geo | 1900 | 7/30-8/17 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| George Browne | browne001geo | 1900 | 8/22-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Frank Brozier | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | |||
| Bruce | bruce-001--- | 1900 | +5/9+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Bruce | bruce-001--- | 1900 | +5/11-6/8 | Kokomo | Indiana State League | Kokomo, IN | |
| Lou Bruce | bruce-001lou | 1900 | U. of Pennsylvania | College | , | ||
| Lou Bruce | bruce-001lou | 1900 | 4/28-9/12 | Toronto Canucks | Eastern League | Toronto, ON | |
| Frank Bruggeman | brugge001fra | 1900 | Rock Rapids | Independent | Rock Rapids, IA | ||
| R. R. Bruggins | 1900 | no g. | Cleveland Lake Shores | American League | Cleveland, OH | ||
| Brun | brun--001--- | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Ed Bruyette | bruyet001edw | 1900 | 5/12-6/11 | Hamilton Hams | International League | Hamilton, ON | |
| Ed Bruyette | bruyet001edw | 1900 | 6/25-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Ed Bruyette | bruyet001edw | 1900 | 7/13-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| H. T. Bryan | 1900 | 6/25-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | ||
| Al Buckenberger | bucken001al- | 1900 | 4/26-9/23 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Buckley | 1900 | 6/2 | Portsmouth Boers | Virginia League | Portsmouth, VA | ||
| Dick Buckley | buckle001dic | 1900 | 5/23-8/19 | Chicago White Stockings | American League | Chicago, IL | |
| Patrick Buckley | buckle001pat | 1900 | 4/28-6/16 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Patrick Buckley | buckle001pat | 1900 | 6/19-6/30 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Patrick Buckley | buckle001pat | 1900 | 6/28-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Harry Buckner | buckne002har | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Albert Buege | buege-001alb | 1900 | 5/4-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Albert Buege | buege-001alb | 1900 | 7/12-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| Charlie Buelow | buelow001cha | 1900 | 4/20-5/19 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Charlie Buelow | buelow001cha | 1900 | 7/3-7/12 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Fritz Buelow | buelow001fre | 1900 | 5/28-6/19 | 6 g. | St. Louis | National League | St. Louis, MO |
| Fritz Buelow | buelow001fre | 1900 | 7/21-9/4 | Denver Grizzlies | Western League | Denver, CO | |
| Fritz Buelow | buelow001fre | 1900 | 9/11-9/15 | 6 g. | St. Louis | National League | St. Louis, MO |
| Carl Burbank | burban000car | 1900 | Georgetown Col. | College | , | ||
| Carl Burbank | burban000car | 1900 | 7/10-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| William Burge | burge-001wil | 1900 | 13 g. | Bakersfield | San Joaquin | Bakersfield, CA | |
| Eddie Burke | burke-002edd | 1900 | 4/23 | Chicago White Stockings | American League | Chicago, IL | |
| Eddie Burke | burke-002edd | 1900 | 4/27-5/2 | Minneapolis Millers | American League | Minneapolis, MN | |
| Eddie Burke | burke-002edd | 1900 | 5/9-5/17 | Buffalo Bisons | American League | Buffalo, NY | |
| Eddie Burke | burke-002edd | 1900 | -9/22 | 59 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Eddie Burke | burke-002edd | 1900 | Umpire | Montana State League | , | ||
| Jimmy Burke | burke-004jam | 1900 | 4/21-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Jesse Burkett | burket001jes | 1900 | 4/19-10/14 | 141 g. | St. Louis | National League | St. Louis, MO |
| Burnett | 1900 | Hampton Crabs | Virginia League | Hampton, VA | |||
| Walter Burnham | burnha002wal | 1900 | 4/30-6/14 | Scranton Miners | Atlantic League | Scranton, PA | |
| Walter Burnham | burnha002wal | 1900 | Bangor | Independent | Bangor, ME | ||
| Billy Burns | burns-013wil | 1900 | Penn State Univ. | College | , | ||
| Billy Burns | burns-013wil | 1900 | Chester | Independent | Chester, PA | ||
| Billy Burns | burns-013wil | 1900 | 6/25-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Farmer Burns | burns-010jam | 1900 | Holy Ghost Col. | College | , | ||
| Farmer Burns | burns-010jam | 1900 | 5/24-6/2 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Farmer Burns | burns-010jam | 1900 | 6/11-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Jack Burns | burns-007joh | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Jack Burns | burns-007joh | 1900 | 6/20-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| Jack Burns | burns-010joh | 1900 | 6/3-6/7 | Minneapolis Millers | American League | Minneapolis, MN | |
| Jack Burns | burns-010joh | 1900 | Aberdeen | Independent | Aberdeen, SD | ||
| James Burns | 1900 | Detroit Tigers | American League | Detroit, MI | |||
| Pete Burns | burns-001pet | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | ||
| Tom Burns | burns-001tom | 1900 | 4/26-9/23 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Frank Burrell | burrel001bus | 1900 | Norwich Witches | Connecticut State League | Norwich, CT | ||
| Frank Burrell | burrel001bus | 1900 | 5/11-9/8 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Harry Burrell | burrel001har | 1900 | 5/6-6/22 | Omaha Omahogs | Western League | Omaha, NE | |
| Leland Burrell | burrel000lel | 1900-02 | Williams | College | , | ||
| Ad Burris | burris002a-- | 1900 | Galena KS | Independent | Galena, KS | ||
| Danny Burt | burt--001dan | 1900 | 94 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Danny Burt | burt--001dan | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Danny Burt | burt--001dan | 1900 | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| Harry Burton | burton007--- | 1900 | 1 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Alfred Bushey | bushey001alf | 1900 | 5/10-7/20 | New London Whalers | Connecticut State League | New London, CT | |
| Charley Busse | busse-001car | 1900 | 5/10-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Harry Bussey | bussey001har | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Harry Bussey | bussey001har | 1900 | 6/14-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Bustillos | 1900 | 13 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Butler | butler003--- | 1900 | 8/6-9/7 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Ike Butler | butler001isa | 1900 | 5/1-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| J.W. Butler | butler000jw- | 1900 | 4/1- | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Butt | 1900 | Portsmouth Boers | Virginia League | Portsmouth, VA | |||
| John Buttermore | butter001joh | 1900 | 4/26-5/14 | Syracuse Stars | Eastern League | Syracuse, NY | |
| John Buttermore | butter001joh | 1900 | 5/17-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| C. Button | 1900 | 14 g. | Visalia | San Joaquin | Visalia, CA | ||
| Bill Byers | byers-002jam | 1900 | 4/26-5/5 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Bill Byers | byers-002jam | 1900 | 5/10- | Jersey City City | Atlantic League | Jersey City, NJ | |
| Bill Byers | byers-002jam | 1900 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | ||
| Bill Byers | byers-002jam | 1900 | -6/9 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Bill Byers | byers-002jam | 1900 | 6/14-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Armando Cabanas | cabana000arm | 1900 | San Francisco | Cuban League | , | ||
| James Cadigan | cadiga001jam | 1900 | 36 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| James Cadigan | cadiga001jam | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| James Cadigan | cadiga001jam | 1900 | Decatur Commodores | Central League | Decatur, IL | ||
| Cahill | 1900 | 13 g. | Hanford | San Joaquin | Hanford, CA | ||
| Cahill | cahill003--- | 1900 | 7/?-7/18+ | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Bert Caldwell | 1900 | 11 g. | Fresno | San Joaquin | Fresno, CA | ||
| Garah Caldwell | caldwe000gar | 1900 | +3/23-4/18+ | Trinity Col. (Duke | College | , | |
| Garah Caldwell | caldwe000gar | 1900 | Concord | Independent | Concord, NC | ||
| Garah Caldwell | caldwe000gar | 1900 | -7/ | Newberry SC | Independent | Newberry, SC | |
| Garah Caldwell | caldwe000gar | 1900 | +7/23+ | Statesville | North Carolina Association | Statesville, NC | |
| Dave Calhoun | calhou001dav | 1900 | 4/26-5/30 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Dave Calhoun | calhou001dav | 1900 | -9/8 | 66 g. | Binghamton Crickets | New York State League | Binghamton, NY |
| M. Calkins | calkin001m-- | 1900 | +8/9+ | Kala-Sam Folz | Independent | Kalamazoo, MI | |
| Jack Callahan | callah026--- | 1900 | 5/10-5/19 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Jimmy Callahan | callah002jam | 1900 | 4/21-10/12 | 32 g. | Chicago | National League | Chicago, IL |
| John Callahan | callah006joh | 1900 | 5 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| John Callahan | 1900 | Logansport/Elwood Wanderers | Indiana State League | Logansport, IN | |||
| John Callahan | callah003--- | 1900 | 4/30-5/4 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| John Callahan | callah003--- | 1900 | 5/26 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| John Callahan | callah003--- | 1900 | 4/30-5/4 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| John Callahan | callah003--- | 1900 | 5/26 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| P.S. Callahan | callah002p-- | 1900 | 5/11 | Derby Angels | Connecticut State League | Derby, CT | |
| William Callahan | callah003wil | 1900 | 6/8 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Eugene Calloway | callow000eug | 1900 | +5/4+ | So. U.-Greensboro | College | , | |
| Roman Calzadilla | calzad000rom | 1900 | Habana | Cuban League | , | ||
| C.W. Cameron | camero001c-- | 1900 | 7 g. | San Diego | Southern California League | San Diego, CA | |
| Don Cameron | camero003don | 1900 | U. Minnesota Law | College | , | ||
| Don Cameron | camero003don | 1900 | +6/19+ | Aberdeen | Independent | Aberdeen, SD | |
| Lew Camp | camp--001lew | 1900 | 5/28-6/17 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Count Campau | campau001cha | 1900 | 4/26-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Campbell | campbe019--- | 1900 | +5/6-5/23+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Campbell | 1900 | 1 g. | Visalia | San Joaquin | Visalia, CA | ||
| Campbell | campbe009--- | 1900 | 8/18-8/20 | Minneapolis Millers | American League | Minneapolis, MN | |
| Campbell | campbe064--- | 1900 | 5/4-5/5 | Hampton Crabs | Virginia League | Hampton, VA | |
| Campbell | campbe060--- | 1900 | 8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Thomas Campbell | campbe005tho | 1900 | 4/28-6/16 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Jim Canavan | canava001jim | 1900 | 5/10-9/6 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Joe Cantillon | cantil001jos | 1900 | 4/19-9/17 | Umpire | Amateur | , | |
| Cap Card | card--000cap | 1900 | 6/25-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| George Carey | carey-002geo | 1900 | 4/19-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| Cargo | cargo-001--- | 1900 | 7/29 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Bobby Cargo | cargo-001bob | 1900 | 4/28-9/10 | New Castle Quakers | Interstate League | New Castle, PA | |
| Chick Cargo | cargo-001cha | 1900 | +5/14-7/8 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Chick Cargo | cargo-001cha | 1900 | 7/29-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Carney | carney012--- | 1900 | 5/10-5/14 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Bill Carney | carney002wil | 1900 | 4/28-6/12 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Pat Carney | carney001pat | 1900 | Holy Cross Col. | College | , | ||
| Pat Carney | carney001pat | 1900 | Hinsdale | Independent | Hinsdale, NH | ||
| Pat Carney | carney001pat | 1900 | 9/13-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Charlie Carr | carr--001cha | 1900 | 5/16-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Hart Carr | carr--001ham | 1900 | College | , | |||
| Hart Carr | carr--001ham | 1900 | Morovia | Independent | Morovia, NY | ||
| Hart Carr | carr--001ham | 1900 | Union Springs | Independent | Union Springs, NY | ||
| John Carr | 1900 | John Hopkins | College | , | |||
| John Carr | carr--011joh | 1900 | Durham Bulls | North Carolina Association | Durham, NC | ||
| Lew Carr | carr--001lew | 1900 | Morovia | Independent | Morovia, NY | ||
| Bill Carrick | carric001wil | 1900 | 4/19-10/12 | 45 g. | New York | National League | New York, NY |
| Bernardo Carrillo | carril000ber | 1900 | Cubano | Cuban League | , | ||
| Lazaro Carrillo | carril000laz | 1900 | San Francisco | Cuban League | , | ||
| Ramon Carrillo | carril000ram | 1900 | Habana | Cuban League | , | ||
| Frank Carriveau | carriv001fra | 1900 | -7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Frank Carriveau | carriv001fra | 1900 | 7/31-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Carroll | carrol004--- | 1900 | 5/1 | Kansas City Blues | American League | Kansas City, MO | |
| Kid Carsey | carsey001wil | 1900 | 5/23-6/7 | Buffalo Bisons | American League | Buffalo, NY | |
| Kid Carsey | carsey001wil | 1900 | 6/9-6/12 | Kansas City Blues | American League | Kansas City, MO | |
| Kid Carsey | carsey001wil | 1900 | 18 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Carson | carson018--- | 1900 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | ||
| Carter | carter010--- | 1900 | 4 g. | Oakland Oaks | California League | Oakland, CA | |
| Carter | 1900 | 15 g. | Hanford | San Joaquin | Hanford, CA | ||
| Bobby Carter | carter003rob | 1900 | 60 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Charles Carter | carter005cha | 1900 | -9/22 | 33 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Kid Carter | carter000kid | 1900 | Cuban X Giants | Black Baseball | Cuban, | ||
| Nick Carter | carter002con | 1900 | U. of Virginia | College | , | ||
| Nick Carter | carter002con | 1900 | 5 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Bob Caruthers | caruth001bob | 1900 | 5/17-9/16 | Umpire | Interstate League | , | |
| Carver | 1900 | Reading Browns | Independent | Reading, PA | |||
| James Casey | casey-002jam | 1900 | 4/21 | 1 g. | Brooklyn | National League | Brooklyn, NY |
| James Casey | casey-002jam | 1900 | 5/21-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Pearl Casey | casey-001pea | 1900 | 5/5-5/25 | Denver Grizzlies | Western League | Denver, CO | |
| Pearl Casey | casey-001pea | 1900 | +6/3+ | Ogden | Independent | Ogden, UT | |
| Benny Cassidy | cassid001ber | 1900 | 19 g. | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Benny Cassidy | cassid001ber | 1900 | Binghamton Crickets | New York State League | Binghamton, NY | ||
| Benny Cassidy | cassid001ber | 1900 | 8/9-8/16 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Pete Cassidy | cassid003pet | 1900 | 4/26-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Jose Castaner | castan006jos | 1900 | Habana | Cuban League | , | ||
| Benjamin Castle | castle001ben | 1900 | ClevCity | , | |||
| Lou Castro | castro001lou | 1900 | Manhattan Col. | College | , | ||
| Eli Cates | cates-002eli | 1900 | 4/26-6/8 | Kansas City Blues | American League | Kansas City, MO | |
| Eli Cates | cates-002eli | 1900 | 7/4-9/15 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Fred. Cattieau | 1900 | no g. | Bristol Bellmakers | Connecticut State League | Bristol, CT | ||
| Cavanaugh | cavana012--- | 1900 | 13 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Charles Cavell | cavell001cha | 1900 | 5/11-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| James Cavell | cavell001j-- | 1900 | 6/11-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Cavelle | cavell002--- | 1900 | 8/29 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Creed Cecil | 1900 | 14 g. | Visalia | San Joaquin | Visalia, CA | ||
| Mark Chaffee | 1900 | 45th Infantry | Phillippines | , | |||
| Brownie Chamberlain | chambe001c-- | 1900 | Ramblers | Independent | , | ||
| Cy Chamberlain | chambe001cy- | 1900 | no g. | Norwich Witches | Connecticut State League | Norwich, CT | |
| Rome Chambers | chambe001rom | 1900 | 5/7 | 1 g. | Boston | National League | Boston, MA |
| Rome Chambers | chambe001rom | 1900 | 5/15 | Toronto Canucks | Eastern League | Toronto, ON | |
| Frank Chance | chance001fra | 1900 | 4/22-9/29 | 56 g. | Chicago | National League | Chicago, IL |
| H.L. Chandler | chandl003h-- | 1900 | 4/30-6/21 | Hampton Crabs | Virginia League | Hampton, VA | |
| Theodore Chapewald | 1900 | no g. | Minneapolis Millers | American League | Minneapolis, MN | ||
| Theodore Chapewald | 1900 | Aberdeen | Independent | Aberdeen, SD | |||
| William Chappelle | chappe002wil | 1900 | , | ||||
| Charlie Chech | chech-001cha | 1900 | U. of Wisconsin | College | , | ||
| Charlie Chech | chech-001cha | 1900 | 6/21-7/15 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Charlie Chech | chech-001cha | 1900 | Appleton | Independent | Appleton, WI | ||
| Cheney | cheney004--- | 1900 | Potsdam | Northern New York League | Potsdam, NY | ||
| Jack Chesbro | chesbr002joh | 1900 | 4/26-9/22 | 32 g. | Pittsburgh | National League | Pittsburgh, PA |
| John Cheshire | cheshi002joh | 1900 | 6/26- | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Cupid Childs | childs001cla | 1900 | 4/19-10/02 | 137 g. | Chicago | National League | Chicago, IL |
| Pete Childs | childs001geo | 1900 | 5/11-9/8 | Utica Reds | New York State League | Utica, NY | |
| Pearce Chiles | chiles001pea | 1900 | 4/21-10/13 | 33 g. | Philadelphia | National League | Philadelphia, PA |
| Clancy | clancy018--- | 1900 | Ogdensburg | Northern New York League | Ogdensburg, NY | ||
| Bill Clancy | clancy002wil | 1900 | Potsdam | Northern New York League | Potsdam, NY | ||
| Bill Clancy | clancy002wil | 1900 | Weston-Mott | Independent | , | ||
| Charles Clancy | clancy001cha | 1900 | 5/10-7/25 | Derby Angels | Connecticut State League | Derby, CT | |
| Charles Clancy | clancy001cha | 1900 | 8/1-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Clark | clark-019--- | 1900 | 5/13 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Clark | clark-053--- | 1900 | 5/17 | Scranton Miners | Atlantic League | Scranton, PA | |
| Clark | clark-005--- | 1900 | 6/19 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Clark | clark-035--- | 1900 | 1 g. | Oakland Oaks | California League | Oakland, CA | |
| Vic Clark | clark-001vic | 1900 | Princeton Univ | College | , | ||
| Vic Clark | clark-001vic | 1900 | 5/5 | Toronto Canucks | Eastern League | Toronto, ON | |
| Vic Clark | clark-001vic | 1900 | no g. | Newark Colts | Atlantic League | Newark, NJ | |
| Vic Clark | clark-001vic | 1900 | 6/28-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Wilkie Clark | clark-001wil | 1900 | 6/20-7/20 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Wilkie Clark | clark-001wil | 1900 | 7/27-7/30 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| William Clark | clark-015wil | 1900 | 6/26 | Montreal Royals | Eastern League | Montreal, QC | |
| Willie Clark | clark-013wil | 1900 | 4/21-5/21 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Win Clark | clark-012wil | 1900 | 4/30-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Clarke | clarke009--- | 1900 | 9/3 | Omaha Omahogs | Western League | Omaha, NE | |
| Dad Clarke | clarke001dad | 1900 | 5/16-5/25 | Buffalo Bisons | American League | Buffalo, NY | |
| Dad Clarke | clarke001dad | 1900 | 1 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Fred Clarke | clarke002fre | 1900 | 4/19-10/6 | 106 g. | Pittsburgh | National League | Pittsburgh, PA |
| Josh Clarke | clarke002jos | 1900 | 4/26-5/8 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| William Clarke | clarke004wil | 1900 | 4/19-10/12 | 81 g. | Boston | National League | Boston, MA |
| William Clarke | clarke004wil | 1900-17 | Princeton Univ. | College | , | ||
| Dad Clarkson | clarks001dad | 1900 | Umpire | Montana State League | , | ||
| Dad Clarkson | clarks001dad | 1900 | -9/23 | 24 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Dick Clausen | closso001ric | 1900 | 6/16-7/12 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Dick Clausen | closso001ric | 1900 | 7/18-9/1 | Pueblo Indians | Western League | Pueblo, CO | |
| Fritz Clausen | closso001ric | 1900 | Pueblo Indians | Western League | Pueblo, CO | ||
| Bill Clay | clay--002fre | 1900 | 4/30-5/5 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Bill Clay | clay--002fre | 1900 | 5/9-6/28 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| G.E. Clayton | clayto001g-- | 1900 | 8/11-8/12 | Chicago White Stockings | American League | Chicago, IL | |
| Harry Clayton | clayto001har | 1900 | +5/13-7/17 | Albany Senators | New York State League | Albany, NY | |
| Harry Clayton | clayto001har | 1900 | 7/19-9/8 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Harry Claytor | clayto002hen | 1900 | 8/11-8/12 | Chicago | National League | Chicago, IL | |
| Harry Claytor | clayto002hen | 1900 | 8/23 | Fargo | Independent | Fargo, ND | |
| Harry Claytor | clayto002hen | 1900 | Brainard | Independent | Brainard, MN | ||
| Bill Clements | clemen004wil | 1900 | 5/24-9/7 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Bill Clements | clemen004wil | 1900 | 9/11 | Worcester Farmers | Eastern League | Worcester, MA | |
| Jack Clements | clemen001jac | 1900 | 5/7-7/30 | 16 g. | Boston | National League | Boston, MA |
| Jack Clements | clemen001jac | 1900 | 8/25-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Jack Clements | clemen001jac | 1900 | 10/2-10/3 | 16 g. | Boston | National League | Boston, MA |
| Zora Clevenger | 1900-03 | Univ. of Indiana | College | , | |||
| Thomas Clifford | cliffo001tho | 1900 | 26 g. | Peoria Distillers | Central League | Peoria, IL | |
| Clifton | clifto002--- | 1900 | 4 g. | Decatur Commodores | Central League | Decatur, IL | |
| Clifton | clifto002--- | 1900 | Springfield/Jacksonville | Central League | Springfield, IL | ||
| Edward Cline | 1900 | 6/22-9/3 | Umpire | Western League | , | ||
| Billy Clingman | clingm001wil | 1900 | 4/19-7/23 | 47 g. | Chicago | National League | Chicago, IL |
| Billy Clingman | clingm001wil | 1900 | 8/10-9/17 | Kansas City Blues | American League | Kansas City, MO | |
| James Clinton | clinto002jam | 1900 | 4/30-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Richard Closson | closso001ric | 1900 | 54 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Richard Closson | closso001ric | 1900 | Pueblo Indians | Western League | Pueblo, CO | ||
| Clute | 1900 | 2 g. | Hanford | San Joaquin | Hanford, CA | ||
| Bill Clymer | clymer001wil | 1900 | Wmpt Store | Independent | , | ||
| Bill Clymer | clymer001wil | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Bill Clymer | clymer001wil | 1900 | 6/22-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Joseph Clynes | clynes001jos | 1900 | Gridley | Northern California League | Gridley, CA | ||
| Coakley | 1900 | 7/12-7/14 | Wilmington | North Carolina Association | Wilmington, NC | ||
| Ty Cobb | cobb--001tyr | 1900-03 | Royston GA | Independent | Royston, GA | ||
| Cochran | cochra007--- | 1900 | 5/12 | Pueblo Indians | Western League | Pueblo, CO | |
| Cochran | cochra007--- | 1900 | 5/28 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Cochran | cochra011--- | 1900 | 5 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Jim Cockman | cockma001jam | 1900 | 4/28-5/21 | Toronto Canucks | Eastern League | Toronto, ON | |
| Jim Cockman | cockma001jam | 1900 | 5/24-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Jim Cockman | cockma001jam | 1900 | 7/10-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| Jim Cockman | cockma001jam | 1900 | 8/9-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Homer Coffman | coffma001h-- | 1900 | Greenville | Independent | Greenville, PA | ||
| Dick Cogan | cogan-001dic | 1900 | 6/9-6/25 | 3 g. | New York | National League | New York, NY |
| Charles Cogswell | cogswe003cha | 1900 | +8/14+ | South Bend | Independent | South Bend, IN | |
| Tom Colcolough | colcol001tom | 1900 | 7/12-7/14 | Wilmington | North Carolina Association | Wilmington, NC | |
| Cole | cole--002--- | 1900 | 6/19-7/22 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Percy Coleman | colema001per | 1900 | 5/11-6/23 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Walter Coleman | colema005wal | 1900 | 5/22- | 6 g. | Helena Senators | Montana State League | Helena, MT |
| Walter Coleman | colema005wal | 1900 | -9/23 | 25 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Cap Collars | collar001cap | 1900 | 7/26 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Cap Collars | collar001cap | 1900 | 7/28-8/27 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| H.T. Collier | collie000ht- | 1900 | 7/12-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Jim Collier | 1900 | 9 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Harry Colliflower | collif001har | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Harry Colliflower | collif001har | 1900 | 7/19-7/27+ | New Haven Blues | Connecticut State League | New Haven, CT | |
| Harry Colliflower | collif001har | 1900 | 8/1-8/20 | Derby Angels | Connecticut State League | Derby, CT | |
| Collins | collin017--- | 1900 | +5/15+ | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Chub Collins | collin001chu | 1900 | Hamilton Hams | International League | Hamilton, ON | ||
| Jimmy Collins | collin003jam | 1900 | 4/19-10/13 | 142 g. | Boston | National League | Boston, MA |
| Jim Collopy | collop001jam | 1900 | +5/18-9/8 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Charlie Comiskey | comisk001cha | 1900 | 4/19- | Chicago White Stockings | American League | Chicago, IL | |
| Bunk Congalton | congal001wil | 1900 | 4/28-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Miles Conklin | conkli001mil | 1900 | 5/10-7/1 | Chatham Reds | International League | Chatham, ON | |
| Conley | 1900 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |||
| James Conley | conley004jam | 1900 | preseason | Muncie | Indiana State League | Muncie, IN | |
| James Conley | conley004jam | 1900 | 4/30-5/10 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Bert Conn | conn--001alb | 1900 | 4/30-5/30 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Bert Conn | conn--001alb | 1900 | 6/11-10/11 | 6 g. | Philadelphia | National League | Philadelphia, PA |
| Ollie Conn | conn--001oli | 1900 | 15 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Ollie Conn | conn--001oli | 1900 | Peoria Distillers | Central League | Peoria, IL | ||
| Frank Connaughton | connau001fra | 1900 | 5/12-9/8 | Worcester Farmers | Eastern League | Worcester, MA | |
| Florence Connelly | connel000flo | 1900 | Elmi.-FatherMathew | Independent | Elmira, NY | ||
| John Connelly | 1900 | -10/14 | Canton | Independent | Canton, OH | ||
| John Connolly | connol005joh | 1900 | 5/12-6/1 | New Haven Blues | Connecticut State League | New Haven, CT | |
| John Connolly | connol005joh | 1900 | 6/25 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Thomas Connolly | 1900 | Umpire | New York State League | , | |||
| Connor | connor038--- | 1900 | 8/1 | Dayton Veterans | Interstate League | Dayton, OH | |
| Dennis Connor | 1900 | Umpire | Connecticut State League | , | |||
| Jim Connor | connor001jim | 1900 | 4/26-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Joe Connor | connor002jos | 1900 | 5/10-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Joe Connor | connor002jos | 1900 | 9/24-10/3 | 7 g. | Boston | National League | Boston, MA |
| Roger Connor | connor001rog | 1900 | 5/10-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Bill Connors | connor001wil | 1900 | 6/28-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Bill Connors | connor001wil | 1900 | 4/28-6/26 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Buck Connors | connor000buc | 1900 | 5/10-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Ed Connors | connor002edw | 1900 | 6/25-8/4 | New London Whalers | Connecticut State League | New London, CT | |
| Ed Connors | connor002edw | 1900 | 8/14-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Huck Connors | connor003--- | 1900 | 9/7 | Derby Angels | Connecticut State League | Derby, CT | |
| Huck Connors | connor003--- | 1900 | 9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Barney Conroy | conroy009--- | 1900 | 5/1 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Barney Conroy | conroy009--- | 1900 | 6/6-7/10+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Ben Conroy | conroy001ben | 1900 | 4/30-5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Pat Conroy | conroy001pat | 1900 | 5/1-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| Pat Conroy | conroy001pat | 1900 | 6/7-8/10+ | Derby Angels | Connecticut State League | Derby, CT | |
| T. P. Conroy | 1900 | Umpire | Connecticut State League | , | |||
| Wid Conroy | conroy003wil | 1900 | 4/21-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Charles Conwell | conwel001cha | 1900 | 5/10-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Charles Conwell | conwel001cha | 1900 | 7/10-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| Charles Conwell | conwel001cha | 1900 | 8/28-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Dan Coogan | coogan003dan | 1900 | 5/1-5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Dan Coogan | coogan003dan | 1900 | -9/8 | 82 g. | Cortland Wagonmakers | New York State League | Cortland, NY |
| Cook | 1900 | 14 g. | Visalia | San Joaquin | Visalia, CA | ||
| Dan Cook | cook--003dan | 1900 | Yale University | College | , | ||
| Dan Cook | cook--003dan | 1900 | Paul Smith’s | Independent | , | ||
| Jim Cook | cook--002jam | 1900-03 | U. of Illinois | College | , | ||
| Fred Cooke | cooke-001fre | 1900 | 4/28-7/10,8/27 | Umpire | Interstate League | , | |
| Duff Cooley | cooley001duf | 1900 | 5/2-7/21 | 66 g. | Pittsburgh | National League | Pittsburgh, PA |
| Mel Cooley | cooley001mel | 1900 | no g. | Omaha Omahogs | Western League | Omaha, NE | |
| Jimmy Cooney | cooney002jim | 1900 | 5/11-9/3+ | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Perry Coons | coons-001per | 1900 | 30 g. | Peoria Distillers | Central League | Peoria, IL | |
| Perry Coons | coons-001per | 1900 | 7/22-9/2 | Omaha Omahogs | Western League | Omaha, NE | |
| Perry Coons | coons-001per | 1900 | 9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Cooper | cooper057--- | 1900 | Piedmont SC | Independent | Piedmont, SC | ||
| Cooper | cooper057--- | 1900 | 7/19-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Cooper | cooper057--- | 1900 | Charleston SC | Independent | Charleston, SC | ||
| George Cooper | cooper004geo | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| George Cooper | cooper004geo | 1900 | 7/12-8/3 | London Tecumsehs | International League | London, ON | |
| George Cooper | cooper004geo | 1900 | 8/16-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Jimmy Cooper | cooper002jam | 1900 | -10/14 | Canton | Independent | Canton, OH | |
| Tom Cooper | cooper003tho | 1900 | 3 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Tommy Cope | cope--001tho | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Tommy Cope | cope--001tho | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Tommy Copeland | copela001tho | 1900 | Evansc.- | EvanCourier | Evansville, IN | ||
| James Corbett | corbet002jam | 1900 | 6/11 | Elmira | Atlantic League | Elmira, NY | |
| James Corbett | corbet002jam | 1900 | 6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| James Corbett | corbet002jam | 1900 | 6/27 | Binghamton Crickets | New York State League | Binghamton, NY | |
| James Corbett | corbet002jam | 1900 | 6/30 | Utica Reds | New York State League | Utica, NY | |
| James Corbett | corbet002jam | 1900 | 7/20 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Ted Corbett | corbet001the | 1900 | 5/3 | Minneapolis Millers | American League | Minneapolis, MN | |
| Ted Corbett | corbet001the | 1900 | Aberdeen | Independent | Aberdeen, SD | ||
| Ted Corbett | corbet001the | 1900 | Flandreau | Flandreau, SD | |||
| Ted Corbett | corbet001the | 1900 | Minneapolis Millers | American League | Minneapolis, MN | ||
| Teddy Corbett | corbet001edw | 1900 | +6/17+ | Seat.-Nationals | Independent | Seattle, WA | |
| Corcoran | corcor012--- | 1900 | 6/6-6/12 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| David Corcoran | corcor001dav | 1900 | Umpire | Connecticut State League | , | ||
| Phil Corcoran | corcor001phi | 1900 | 7/23-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Tommy Corcoran | corcor002tho | 1900 | 4/19-10/14 | 127 g. | Cincinnati | National League | Cincinnati, OH |
| Frank Corridon | corrid001fra | 1900 | 4/30-5/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Frank Corridon | corrid001fra | 1900 | 5/30-7/25+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Frank Corridon | corrid001fra | 1900 | 8/7-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| George Costello | costel000geo | 1900-02 | Cornell Univ | College | , | ||
| Henry Cote | cote--002hen | 1900 | 5/5-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Bill Coughlin | coughl001wil | 1900 | 4/19-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Cy Coulter | coulte001art | 1900 | Greensburg PA | Independent | Greensburg, PA | ||
| Cy Coulter | coulte001art | 1900 | 8/7-9/8 | Rome Romans | New York State League | Rome, NY | |
| Thomas Coursey | 1900 | +8/13+ | Morovia | Independent | Morovia, NY | ||
| Ernie Courtney | courtn001edw | 1900 | 85 g. | Stockton Wasps | California League | Stockton, CA | |
| George Courtney | courtn001geo | 1900 | 5/9-6/2+ | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| George Courtney | courtn001geo | 1900 | 6/7 | Derby Angels | Connecticut State League | Derby, CT | |
| George Courtney | courtn001geo | 1900 | 7/10-7/21 | New London Whalers | Connecticut State League | New London, CT | |
| Ernest Crabill | crabil001ern | 1900 | 5/11-9/7 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Leech Cracraft | cracra000lee | 1900 | +5/14+ | U. of Virginia | College | , | |
| Morey Crall | crall-001mau | 1900 | 5/10-6/9 | Hamilton Hams | International League | Hamilton, ON | |
| Morey Crall | crall-001mau | 1900 | 6/17-7/4 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Crane | crane-003--- | 1900 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | ||
| M.W. Crane | crane-000mw- | 1900 | +6/6+ | Brown University | College | , | |
| M.W. Crane | crane-000mw- | 1900 | 6/25-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Bill Cranston | cranst001wil | 1900 | NC | , | |||
| Sam Crawford | crawfo001sam | 1900 | 4/19-9/3 | 101 g. | Cincinnati | National League | Cincinnati, OH |
| Crawley | crawle003--- | 1900 | 6/20 | New Castle Quakers | Interstate League | New Castle, PA | |
| Al Crawley | crawle001alg | 1900 | 6/27-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Al Crawley | crawle001alg | 1900 | Rome GA | Independent | Rome, GA | ||
| E. A. Creamer | 1900 | no g. | Springfield Ponies/Maroons | Eastern League | Springfield, MA | ||
| Jersey Crew | 1900 | Virden | Western Canada | Virden, MB | |||
| Lou Criger | criger001lou | 1900 | 4/21-10/14 | 80 g. | St. Louis | National League | St. Louis, MO |
| Pat Crisham | crisha002pat | 1900 | 4/20-9/16 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Harry Criss | 1900 | Umpire | Interstate League | , | |||
| Bill Cristall | crista001wil | 1900 | 5/11-6/11 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Bill Cristall | crista001wil | 1900 | 6/20-9/7 | Albany Senators | New York State League | Albany, NY | |
| Bill Cristall | crista001wil | 1900 | 9/12-9/19 | Worcester Farmers | Eastern League | Worcester, MA | |
| Davey Crockett | crocke001dan | 1900 | Portsmouth Boers | Virginia League | Portsmouth, VA | ||
| Davey Crockett | crocke001dan | 1900 | +7/16+ | Piedmont SC | Independent | Piedmont, SC | |
| Davey Crockett | crocke001dan | 1900 | 7/22-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Harry Croft | croft-001hen | 1900 | 5/11-9/8 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Cronin | cronin012--- | 1900 | 6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Jack Cronin | cronin001joh | 1900 | 4/19-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Patsy Cronin | cronin001pat | 1900 | 4/28-5/7 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Jack Crooks | crooks001jac | 1900 | 6/8-6/16 | Buffalo Bisons | American League | Buffalo, NY | |
| Leo Crosin | 1900 | Fordham Univ. | College | , | |||
| Frank Cross | cross-001fra | 1900 | Painesville | Semi-professional | Painesville, OH | ||
| Frank Cross | cross-001fra | 1900 | 8/14-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Lave Cross | cross-001laf | 1900 | 4/19-5/8 | 16 g. | St. Louis | National League | St. Louis, MO |
| Lave Cross | cross-001laf | 1900 | 5/17-10/13 | 117 g. | Brooklyn | National League | Brooklyn, NY |
| Lem Cross | cross-001lem | 1900 | 5/13-9/19 | Montreal Royals | Eastern League | Montreal, QC | |
| Lem Cross | cross-001lem | 1900 | Reading Coal Heavers | Atlantic League | Reading, PA | ||
| Monte Cross | cross-001mon | 1900 | 4/19-10/13 | 131 g. | Philadelphia | National League | Philadelphia, PA |
| Dan Crotty | crotty001dan | 1900 | 15 g. | Springfield/Jacksonville | Central League | Jacksonville, IL | |
| Charles Crowe | crowe-001cha | 1900 | 4/29-7/20 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Frank Crowe | crowe-001fra | 1900 | 5/17-5/20+ | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Frank Crowe | crowe-001fra | 1900 | 6/28 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Dick Crozier | crozie001j-- | 1900 | 100 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Cuddy | 1900 | Brown University | College | , | |||
| Cuddy | cuddy-001--- | 1900 | 5/12-7/4 | Rome Romans | New York State League | Rome, NY | |
| Charles Cuddy | cuddy-000cha | 1900 | Baltimore Atlantics | Baltimore City League | Baltimore, MD | ||
| Charles Cuddy | cuddy-000cha | 1900 | +6/18+ | Wellington MA | Independent | Wellington, MA | |
| Charles Cuddy | cuddy-000cha | 1900 | 7/3-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Charles Cuddy | cuddy-000cha | 1900 | 7/3-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Eddie Cull | cull--001edw | 1900 | 21st Infantry | Army | , | ||
| Culver | culver001--- | 1900 | 5/2-5/10 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Charles Culver | culver002cha | 1900 | +5/30+ | Mauch Chunk | Independent | Mauch Chunk, PA | |
| William Culver | culver002wil | 1900 | +5/30+ | Mauch Chunk | Independent | Mauch Chunk, PA | |
| Cummings | 1900 | 13 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Cy Cummings | cummin012--- | 1900 | 6/25-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| Bert Cunningham | cunnin001ell | 1900 | 5/25-9/25 | 8 g. | Chicago | National League | Chicago, IL |
| George Cuppy | cuppy-001geo | 1900 | 5/26-9/3 | 17 g. | Boston | National League | Boston, MA |
| Jacob Cuppy | cuppy-001jac | 1900 | +5/17-6/3 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Walter Curley | curley001doc | 1900 | 4/28-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Sammy Curran | curran001sim | 1900 | Tufts College | College | , | ||
| Sammy Curran | curran001sim | 1900 | 5/15-9/5 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Curtis | curtis003--- | 1900 | 5/11 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Curtis | curtis007--- | 1900 | 5/3 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Curtis | curtis012--- | 1900 | 6/18-6/20 | Hampton Crabs | Virginia League | Hampton, VA | |
| Harry Curtis | 1900 | , | |||||
| Joe Curtis | curtis001jos | 1900 | 4/30-5/21 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| John Curtis | curtis002joh | 1900 | 4/30-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| John Curtis | curtis004har | 1900 | 6/29-7/10 | Binghamton Crickets | New York State League | Binghamton, NY | |
| John Curtis | curtis004har | 1900 | 7/15-7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| John Curtis | curtis004har | 1900 | 7/30-9/3 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Paul Curtis | curtis001pau | 1900 | Kansas City Blues | American League | Kansas City, MO | ||
| Jack Cusisk | cusick001joh | 1900 | 5/10-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Angel D'Meza | dmeza-000ang | 1900 | Almendarista | Cuban League | , | ||
| Bill Dahlen | dahlen001wil | 1900 | 4/19-10/12 | 133 g. | Brooklyn | National League | Brooklyn, NY |
| William Dahlquist | dahlqu001wil | 1900 | Madison SD | Independent | Madison, SD | ||
| Daley | daley-009--- | 1900 | 2 g. | Azusa | Southern California League | Azusa, CA | |
| Eddie Daley | daley-001edw | 1900 | +5/20-9/8 | Troy Washerwomen | New York State League | Troy, NY | |
| George Dalrymple | dalrym001geo | 1900 | 5/5-9/4 | Pueblo Indians | Western League | Pueblo, CO | |
| Daly | 1900 | Derby Angels | Connecticut State League | Derby, CT | |||
| Tom Daly | daly--002tho | 1900 | 4/19-10/13 | 97 g. | Brooklyn | National League | Brooklyn, NY |
| Bill Dammann | damman001bil | 1900 | 4/20 -8/10 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Sam Damoth | damuth001sam | 1900 | +9/4-9/28+ | Kalamazoo MI Gazettes | Kalamazoo, MI | ||
| Jesse Daniels | daniel002jes | 1900 | +5/24+ | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Pete Daniels | daniel003pet | 1900 | 5/1-8/11 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Pete Daniels | daniel003pet | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| Pete Daniels | daniel002jes | 1900 | 8/18-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Danks | 1900 | 1 g. | Fresno | San Joaquin | Fresno, CA | ||
| Harry Dannehower | danneh001j-- | 1900 | +4/13+ | Trinity Col. (Duke) | College | , | |
| Harry Dannehower | danneh001j-- | 1900 | 5/15-7/9 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Harry Dannehower | danneh001j-- | 1900 | 7/16-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Dan Daub | daub--002dan | 1900 | 4/20-5/17 | Kansas City Blues | American League | Kansas City, MO | |
| Davey | davey-007--- | 1900 | Seattle | Seattle, WA | |||
| Davis | davis-048--- | 1900 | 5/2 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Davis | davis-046--- | 1900 | 9/9 | Dayton Veterans | Interstate League | Dayton, OH | |
| Bill Davis | davis-023wil | 1900 | 5/22-9/23 | Great Falls Indians | Montana State League | Great Falls, MT | |
| Elmer Davis | davis-002elm | 1900 | PunxsutawneyPA | Independent | Punxautawney, PA | ||
| George Davis | davis-015geo | 1900 | 4/19-10/13 | 114 g. | New York | National League | New York, NY |
| H. Davis | davis-002h-- | 1900 | 6/5 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Harry Davis | davis-006har | 1900 | 4/26-9/19 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Ira Davis | davis-008j-- | 1900 | 5/5-7/19 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Ira Davis | davis-008j-- | 1900 | Rock Rapids | Independent | Rock Rapids, IA | ||
| Ira Davis | davis-008j-- | 1900 | 8/21-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| J. Davis | davis-009j-- | 1900 | 6/5-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Lefty Davis | davis-001alf | 1900 | 4/19-8/27 | Minneapolis Millers | American League | Minneapolis, MN | |
| Pop Davis | davis-001pop | 1900 | , | ||||
| Pop Davis | davis-001pop | 1900 | +8/10+ | Salina | Independent | Salina, KS | |
| S.D. Davis | davis-002s-- | 1900 | Albany Senators | New York State League | Albany, NY | ||
| Lee Dawkins | dawkin001lev | 1900 | 5/5-5/13 | Pueblo Indians | Western League | Pueblo, CO | |
| Lee Dawkins | dawkin001lev | 1900 | Umpire | Western League | , | ||
| Bill Day | day---001bil | 1900 | 5/14-6/12 | Rome Romans | New York State League | Rome, NY | |
| Bill Day | day---001bil | 1900 | 6/22-7/11 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| A.B. Deal | deal--000ab- | 1900 | 5/5-5/31 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Louis Deal | deal--001lou | 1900 | 5/2-8/17 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Louis Deal | deal--001lou | 1900 | 9/4-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| Jimmy Dean | dean--001jam | 1900 | 4/30-6/9 | Elmira | Atlantic League | Elmira, NY | |
| Jimmy Dean | dean--001jam | 1900 | -6/11 | 77 g. | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY |
| Jimmy Dean | dean--001jam | 1900 | 6/13-9/6 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Charlie DeArmond | dearmo002cha | 1900 | +6/3+ | Anderson | Indiana State League | Anderson, IN | |
| Archie DeBaker | debake001art | 1900 | Muskegon | Independent | Muskegon, MI | ||
| John Deering | deerin001joh | 1900 | 5/11-7/7 | New London Whalers | Connecticut State League | New London, CT | |
| John Deering | deerin001joh | 1900 | 7/11-7/17 | Derby Angels | Connecticut State League | Derby, CT | |
| Henry Deisel | deisel001c-- | 1900 | 4/30-6/16 | Hampton Crabs | Virginia League | Hampton, VA | |
| Jacob Deisel | deisel001jac | 1900 | 5/22-9/23 | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Ed Delahanty | delaha001edw | 1900 | 4/19-10/2 | 131 g. | Philadelphia | National League | Philadelphia, PA |
| Jim Delahanty | delaha001jam | 1900 | 4/30-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Jim Delahanty | delaha001jam | 1900 | 6/16-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Joe Delahanty | delaha001jos | 1900 | 4/30-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Joe Delahanty | delaha001jos | 1900 | 7/24-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| Tom Delahanty | delaha001tho | 1900 | 4/30-5/29 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Tom Delahanty | delaha001tho | 1900 | 7/18-7/21 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Tom Delahanty | delaha001tho | 1900 | 7/30-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Tom Delahanty | delaha001tho | 1900 | 8/5-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Bill Delaney | delane001bil | 1900 | Canton | Independent | Canton, OH | ||
| Eddie Delaney | delane002edw | 1900 | 5/21-5/26 | Derby Angels | Connecticut State League | Derby, CT | |
| Eddie Delaney | delane002edw | 1900 | 8/6-8/7 | Derby Angels | Connecticut State League | Derby, CT | |
| Eddie Delaney | delane002edw | 1900 | 8/9-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| J. G. Delaney | 1900 | no g. | Meriden Silverites | Connecticut State League | Meriden, CT | ||
| Jimmy Delaney | delane004jam | 1900 | Albany Senators | New York State League | Albany, NY | ||
| Mickey Delaney | delane002mic | 1900 | 5/10-7/19 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Mickey Delaney | delane002mic | 1900 | 7/20-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Edward Demills | demill001edw | 1900 | Wallingford | Independent | Wallingford, CT | ||
| Charles Demong | demong001cha | 1900 | Elmi.-FatherMathew | Independent | Elmira, NY | ||
| Chick Demong | 1900 | no g. | Detroit Tigers | American League | Detroit, MI | ||
| Gene DeMontreville | demont001eug | 1900 | 4/19-10/13 | 69 g. | Brooklyn | National League | Brooklyn, NY |
| Lee DeMontreville | demont002leo | 1900 | 5/11-5/15 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Denean | denean001--- | 1900 | 6/13-7/4 | Chatham Reds | International League | Chatham, ON | |
| Jimmy Dennie | dennie001jim | 1900 | 21 g. | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Joseph Denning | 1900 | Kent | Independent | Kent, OH | |||
| Jerry Denny | denny-001jer | 1900 | 5/10-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Dent | 1900 | Atlantic City | Independent | Atlantic City, NJ | |||
| Roger Denzer | denzer001rog | 1900 | 4/22-9/17 | Chicago White Stockings | American League | Chicago, IL | |
| Billy Derwin | derwin001wil | 1900 | 5/16-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| Billy Derwin | derwin001wil | 1900 | 6/1-6/15 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| W.H. Detmers | detmer000wh- | 1900 | +6/6+ | Brown University | College | , | |
| W.H. Detmers | detmer000wh- | 1900 | 6/25-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Devereaux | 1900 | Asbury Park | Independent | Asbury Park, NJ | |||
| J. Devereaux | 1900 | Danville Champions | Central League | Danville, IL | |||
| William Devereaux | devere001wil | 1900 | 4/1-12/2 | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Art Devlin | devlin001art | 1900-01 | Georgetown Col. | College | , | ||
| Art Devlin | devlin001art | 1900 | 6/25-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Phil Devoin | devoin001phi | 1900 | 7 g. | Azusa | Southern California League | Azusa, CA | |
| Charlie Dexter | dexter002cha | 1900 | 5/25-10/11 | 40 g. | Chicago | National League | Chicago, IL |
| Dickerson | dicker003--- | 1900 | 6/21 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Emerson Dickerson | dicker001eme | 1900 | Grand Rapids Boers | International League | Grand Rapids, MI | ||
| King Dickson | dickso001ale | 1900 | Chester | Independent | Chester, PA | ||
| King Dickson | dickso001ale | 1900 | 7/3-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| King Dickson | dickso002--- | 1900 | 8/11-8/14 | Worcester Farmers | Eastern League | Worcester, MA | |
| King? Dickson | 1900 | , | |||||
| William Diggins | diggin001wil | 1900 | 4/20-5/24 | Cleveland Lake Shores | American League | Cleveland, OH | |
| William Diggins | diggin001wil | 1900 | 5/27-8/22 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Pat Dillard | dillar002pat | 1900 | 4/21-8/18 | 57 g. | St. Louis | National League | St. Louis, MO |
| Pat Dillard | dillar002pat | 1900 | 8/27-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Ed Dillon | dillon001edw | 1900 | Omaha Omahogs | Western League | Omaha, NE | ||
| Frank Dillon | dillon001fra | 1900 | 4/19-4/28 | 5 g. | Pittsburgh | National League | Pittsburgh, PA |
| Frank Dillon | dillon001fra | 1900 | 5/6-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Fred Dingle | dingle001fre | 1900-01 | Clemson Univ. | College | , | ||
| Bill Dinneen | dinnee001wil | 1900 | 4/21-10/3 | 44 g. | Boston | National League | Boston, MA |
| Jimmy Dinneen | dinnee001--- | 1900 | Syracuse Shamrocks | Amateur | Syracuse, NY | ||
| Jimmy Dinneen | dinnee001--- | 1900 | 9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| William Disch | disch-001wil | 1900-09 | St. Edward’s Col. | College | , | ||
| William Disch | disch-001wil | 1900 | Sioux City Cornhuskers | Western League | Sioux City, IA | ||
| William Disch | disch-001wil | 1900 | +7/30+ | Sioux Falls | Independent | Sioux Falls, SD | |
| Harry Dix | 1900 | OH Inst. for Deaf | School | , | |||
| Eddie Dixon | dixon-002edw | 1900 | 4/19-6/12 | Minneapolis Millers | American League | Minneapolis, MN | |
| Eddie Dixon | dixon-002edw | 1900 | 6/26-9/19 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Doane | 1900-02 | U. Nebraska | College | , | |||
| Dobbs | dobbs-003--- | 1900 | 5/15 | Norwich Witches | Connecticut State League | Norwich, CT | |
| John Dobbs | dobbs-001joh | 1900 | 5/11-9/8 | Utica Reds | New York State League | Utica, NY | |
| Lou Dobbs | dobbs-001lou | 1900 | -6/22 | Utica Reds | New York State League | Utica, NY | |
| W.E. Dobbs | dobbs-000we- | 1900 | Wabash | Indiana State League | Wabash, IN | ||
| Willard Dodge | dodge-001wil | 1900 | Beaver Dam | Beaver Dam, WI | |||
| Fred Doe | doe---002fre | 1900 | 5/15-8/16+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Fred Doe | doe---002fre | 1900 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | ||
| Ed Doheny | doheny001edw | 1900 | 4/20-7/21 | 20 g. | New York | National League | New York, NY |
| Ed Doheny | doheny001edw | 1900 | 8/2-8/29 | Chicago White Stockings | American League | Chicago, IL | |
| Ed Doheny | doheny001edw | 1900 | 9/6 | 20 g. | New York | National League | New York, NY |
| Doherty | dohert004--- | 1900 | 6/5-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Jack Doherty | dohert001joh | 1900 | 5/10-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| James Doherty | dohert004jam | 1900 | Dubois | Independent | Dubois, PA | ||
| Jimmy Doherty | doughe012--- | 1900 | 8/20-8/29 | Dayton Veterans | Interstate League | Dayton, OH | |
| Mike Doherty | dohert001mic | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Mike Doherty | dohert001mic | 1900 | 6/25-6/26 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Mike Doherty | dohert001mic | 1900 | 6/28-7/10 | Toronto Canucks | Eastern League | Toronto, ON | |
| Mike Doherty | dohert001mic | 1900 | 7/15-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Cozy Dolan | dolan-001pat | 1900 | 4/28-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Cozy Dolan | dolan-001pat | 1900 | 9/29-10/13 | 13 g. | Chicago | National League | Chicago, IL |
| Joe Dolan | dolan-001jos | 1900 | 4/21-10/13 | 74 g. | Philadelphia | National League | Philadelphia, PA |
| John Dolan | dolan-002joh | 1900 | 5/14-9/7 | Schenectady Electricians | New York State League | Schenectady, NY | |
| William Dommel | dommel001wil | 1900 | Lancaster Actives | Independent | Lancaster, PA | ||
| Dennis Donahue | donahu001den | 1900 | Elmi.-FatherMathew | Independent | Elmira, NY | ||
| Jiggs Donahue | donahu001joh | 1900 | 4/28-9/2 | Dayton Veterans | Interstate League | Dayton, OH | |
| Jiggs Donahue | donahu001joh | 1900 | 9/10-10/13 | 3 g. | Pittsburgh | National League | Pittsburgh, PA |
| Red Donahue | donahu001fra | 1900 | 4/23-10/04 | 32 g. | Philadelphia | National League | Philadelphia, PA |
| She Donahue | donahu002cha | 1900 | 5/11-7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| She Donahue | donahu002cha | 1900 | 7/30-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Thomas Donahue | donahu001tho | 1900 | Winsted-TAB | Independent | Winsted, CT | ||
| Thomas Donahue | donahu002tho | 1900 | 5/22- | 59 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Thomas Donahue | donahu001tho | 1900 | Villanova Col. | College | , | ||
| Thomas Donahue | donahu001tho | 1900 | Fleischman’s | Independent | Cincinnati, OH | ||
| Tim Donahue | donahu001tim | 1900 | 4/19-10/13 | 67 g. | Chicago | National League | Chicago, IL |
| Mike Donlin | donlin001mic | 1900 | 4/26-10/14 | 78 g. | St. Louis | National League | St. Louis, MO |
| Mike Donlin | donlin001mic | 1900 | San Diego | Southern California League | San Diego, CA | ||
| Frank Donnelly | donnel002fra | 1900 | 4/28-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| Jim Donnelly | donnel002jim | 1900 | 5/4-6/2 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Jim Donnelly | donnel002jim | 1900 | Spri.-Westfield | Independent | Springfield, | ||
| Jim Donnelly | donnel002jim | 1900 | 8/8-8/16 | New Haven Blues | Connecticut State League | New Haven, CT | |
| John Donnelly | donnel001joh | 1900-03 | U. of North Carolina | College | , | ||
| August Donohoo | 1900 | +5/26+ | U. Alabama | College | , | ||
| Donovan | donova032--- | 1900 | 5/11-5/12 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Donovan | donova032--- | 1900 | 5/21-6/3 | Chatham Reds | International League | Chatham, ON | |
| Bill Donovan | donova004wil | 1900 | 4/26-9/13 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Bill Donovan | donova004wil | 1900 | 9/17-10/11 | 5 g. | Brooklyn | National League | Brooklyn, NY |
| Fred Donovan | donova002fre | 1900 | 5/11-9/1 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Patsy Donovan | donova001pat | 1900 | 4/19-10/14 | 126 g. | St. Louis | National League | St. Louis, MO |
| Tom Donovan | donova002tho | 1900 | 6/5 | Newark Colts | Atlantic League | Newark, NJ | |
| Tom Donovan | donova002tho | 1900 | 7/14-9/7 | Troy Washerwomen | New York State League | Troy, NY | |
| Tommy Donovan | donova001tom | 1900 | 5/10-5/14 | New London Whalers | Connecticut State League | New London, CT | |
| Charles Dooley | dooley001cha | 1900 | 4/26-9/15 | Montreal Royals | Eastern League | Montreal, QC | |
| Frank Doran | doran-001fra | 1900 | 5/10-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Frank Doran | doran-001fra | 1900 | 7/10-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| Frank Doran | doran-001fra | 1900 | 9/4-9/8 | Worcester Farmers | Eastern League | Worcester, MA | |
| Tom Doran | doran-002tho | 1900 | 6/5-6/14 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Peter Dorn | dorn--001pet | 1900 | 8/27 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Luke Dorsey | dorsey001luk | 1900 | 5/11-5/31 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Luke Dorsey | dorsey001luk | 1900 | 6/4-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| M.J. Dorsey | dorsey001m-- | 1900 | 5/11-5/16 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Herm Doscher | dosche001her | 1900 | 7/25-7/27 | Umpire | Eastern League | , | |
| Jack Doscher | dosche001joh | 1900 | 5/2 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Jack Doscher | dosche001joh | 1900 | 5/4-5/12 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Jack Doscher | dosche001joh | 1900 | +5/22-6/8 | Anderson | Indiana State League | Anderson, IN | |
| Jack Doscher | dosche001joh | 1900 | 6/17-6/22 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Patsy Dougherty | doughe002pat | 1900 | 5/8-9/4 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| John Douglass | 1900 | North Attleboro | Independent | North Attleboro, MA | |||
| John Douglass | 1900 | North Adams | Independent | North Adams, MA | |||
| Klondike Douglass | dougla004wil | 1900 | 4/23-10/11 | 50 g. | Philadelphia | National League | Philadelphia, PA |
| Tommy Dowd | dowd--001tho | 1900 | 4/24-6/4 | Chicago White Stockings | American League | Chicago, IL | |
| Tommy Dowd | dowd--001tho | 1900 | 6/6-8/13 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Joe Dowie | dowie-001joe | 1900 | Bloomington | Independent | Bloomington, IN | ||
| Joe Dowie | dowie-001joe | 1900 | Selma | Independent | Selma, AL | ||
| Patrick Dowling | dowlin001pat | 1900-03 | Georgetown Col. | College | , | ||
| Pete Dowling | dowlin001hen | 1900 | 4/21-9/16 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Jim Downey | downey002jam | 1900 | 5/11-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Dave Dowst | 1900 | 1 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Doyle | doyle-030--- | 1900 | 7/9 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Charles Doyle | doyle-002cha | 1900 | 4/1-12/2 | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Charles Doyle | doyle-001cha | 1900 | +5/11-5/20+ | Muncie | Indiana State League | Muncie, IN | |
| Charles Doyle | doyle-001cha | 1900 | 5/22+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Jack Doyle | doyle-002joh | 1900 | 4/19-10/13 | 133 g. | New York | National League | New York, NY |
| Jim Doyle | doyle-004jam | 1900-04 | Niagara Univ. | College | , | ||
| Jake Drauby | drauby001jak | 1900 | 4/30-6/9 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Jack Drennan | drenna001kir | 1900 | -12/2 | 88 g. | Oakland Oaks | California League | Oakland, CA |
| Bobby Drew | drew--001edw | 1900 | 5/10-7/14 | New London Whalers | Connecticut State League | New London, CT | |
| Bobby Drew | drew--001edw | 1900 | +7/19-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Lew Drill | drill-001lew | 1900 | Aberdeen | Independent | Aberdeen, SD | ||
| Lew Drill | drill-001lew | 1900 | Flandreau | Flandreau, SD | |||
| Vianello Drinkwater | drinkw001via | 1900 | 5/11-7/29 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Vianello Drinkwater | drinkw001via | 1900 | 8/4-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Ferd Drumm | drumm-001fer | 1900 | 4/-10/14 | Canton | Independent | Canton, OH | |
| Jim Drumm | drumm-001jim | 1900 | 6 g. | Azusa | Southern California League | Azusa, CA | |
| Tom Drummy | drummy001tom | 1900 | 4/30-5/15 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Tom Drummy | drummy001tom | 1900 | Sioux Falls | Independent | Sioux Falls, SD | ||
| Jimmy Dubach | dubach001--- | 1900 | +5/10-5/28+ | Muncie | Indiana State League | Muncie, IN | |
| Pat Duff | duff--001pat | 1900 | 5/10-6/13+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Pat Duff | duff--001pat | 1900 | 6/16-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Pat Duff | duff--001pat | 1900 | 9/15-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Hugh Duffy | duffy-001hug | 1900 | 4/19-10/13 | 55 g. | Boston | National League | Boston, MA |
| John Duffy | duffy-003joh | 1900 | 5/11-8/30 | Albany Senators | New York State League | Albany, NY | |
| Dan Dugdale | dugdal001dan | 1900 | Seattle | Independent | Seattle, WA | ||
| Bill Duggleby | duggle001wil | 1900 | 5/3-5/30 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Bill Duggleby | duggle001wil | 1900 | 6/6-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Duke | duke--002--- | 1900 | 6/11-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Gus Dundon | dundon001aug | 1900 | 4/26-5/15 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Gus Dundon | dundon001aug | 1900 | 5/22-6/2 | Toronto Canucks | Eastern League | Toronto, ON | |
| Gus Dundon | dundon001aug | 1900 | 6/13-7/7 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Gus Dundon | dundon001aug | 1900 | 7/9-8/19 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Gus Dundon | dundon001aug | 1900 | 8/24-9/15 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Sam Dungan | dungan001sam | 1900 | 4/25-5/4 | 6 g. | Chicago | National League | Chicago, IL |
| Sam Dungan | dungan001sam | 1900 | 5/18-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Wiley Dunham | dunham001hen | 1900 | Dayton Veterans | Interstate League | Dayton, OH | ||
| Davy Dunkle | dunkle001edw | 1900 | 4/28-9/19 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Bill Dunleavy | dunlea001wil | 1900 | 4/1- | 30 g. | Oakland Oaks | California League | Oakland, CA |
| Bill Dunleavy | dunlea001wil | 1900 | 30 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Jack Dunleavy | dunlea001joh | 1900 | Pawtucket | Independent | Pawtucket, RI | ||
| Dunn | dunn--003--- | 1900 | 9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Jack Dunn | dunn--005joh | 1900 | 4/20-7/27 | 10 g. | Brooklyn | National League | Brooklyn, NY |
| Jack Dunn | dunn--005joh | 1900 | 8/24-10/12 | 10 g. | Philadelphia | National League | Philadelphia, PA |
| Samuel Dunn | 1900 | Lancaster Actives | Independent | Lancaster, PA | |||
| George Duquette | duquet001geo | 1900 | +9/6 | Potsdam | Northern New York League | Potsdam, NY | |
| James Durham | durham003jam | 1900-01 | Southwest College - Ks | College | , | ||
| Robert Durnbaugh | durnba001rob | 1900 | 5/10-5/18 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Robert Durnbaugh | durnba001rob | 1900 | 5/23-9/5 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Ike Durrett | durret001isa | 1900 | 4/30-6/15 | Hampton Crabs | Virginia League | Hampton, VA | |
| Ike Durrett | durret001isa | 1900 | 54 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Duval | duval-002--- | 1900 | Port Huron Tunnelites | International League | Port Huron, MI | ||
| Alfred Duvall | duvall001alf | 1900 | 5/10-5/16 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Eddie Dwyer | dwyer-020--- | 1900 | +8/14+ | South Bend | Independent | South Bend, IN | |
| Frank Dwyer | dwyer-001fra | 1900 | 4/19-9/18 | Umpire | Amateur | , | |
| Billy Dyer | dyer--001wil | 1900 | Holy Cross Col. | College | , | ||
| S. B. Dyer | 1900 | Hamline Univ. | College | , | |||
| S. B. Dyer | 1900 | Aberdeen | Independent | Aberdeen, SD | |||
| Bill Eagan | eagan-001bil | 1900 | 5/22-6/24 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Bill Eagan | eagan-002bil | 1900 | 7/28-8/3 | New London Whalers | Connecticut State League | New London, CT | |
| Pete Eagan | eagan-001pat | 1900 | +5/16-9/7 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Truck Eagan | eagan-001cha | 1900 | 4/1-12/2 | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Bobby Eager | eager-001rob | 1900 | 15 g. | Stockton Wasps | California League | Stockton, CA | |
| Bobby Eager | eager-001rob | 1900 | Sacramento Gilt Edges | California League | Sacramento, CA | ||
| Howard Earl | earl--002how | 1900 | +5/21-9/8 | Utica Reds | New York State League | Utica, NY | |
| Billy Earle | earle-001bil | 1900 | Richmond IN | Independent | Richmond, IN | ||
| Anthony Earley | earley001ant | 1900 | 5/5-5/12 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Mal Eason | eason-001mal | 1900 | Grove City Col. | College | , | ||
| Mal Eason | eason-001mal | 1900 | 4/30-6/11 | Elmira | Atlantic League | Elmira, NY | |
| Mal Eason | eason-001mal | 1900 | -9/7 | 30 g. | Cortland Wagonmakers | New York State League | Cortland, NY |
| Mal Eason | eason-001mal | 1900 | 9/11-9/22 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Mal Eason | eason-001mal | 1900 | 10/1 | 1 g. | Chicago | National League | Chicago, IL |
| Chris Eastman | eastma001chr | 1900 | Flandreau | Independent | Flandreau, SD | ||
| Wilbur Eberly | eberly001wil | 1900 | 5/30+ | Kokomo | Indiana State League | Kokomo, IN | |
| Charles Ebert | ebert-001cha | 1900 | 3 g. | Danville Champions | Central League | Danville, IL | |
| Hi Ebright | ebrigh001hi- | 1900 | 5/5-6/2 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Hi Ebright | ebrigh001hi- | 1900 | 6/3-9/4 | Umpire | Western League | , | |
| John Eby | eby---001joh | 1900 | +7/4+ | Norwood PA | Independent | Norwood, PA | |
| Fred Eddy | eddy--001fre | 1900 | 5/12-6/30 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Dave Edwards | edward007dav | 1900 | 16 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Jack Egan | egan--001rip | 1900 | 4/26-9/21 | Umpire | Eastern League | , | |
| Rip Egan | egan--002joh | 1900 | 4/30-5/16 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Rip Egan | egan--002joh | 1900 | 6/5-7/5 | Omaha Omahogs | Western League | Omaha, NE | |
| Rip Egan | egan--002joh | 1900 | Oconto WI | Independent | Oconto, WI | ||
| Red Ehret | ehret-001phi | 1900 | 4/20-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Harry Eichler | eichle001har | 1900 | 4/28-5/1 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Harry Eichler | eichle001har | 1900 | 5/18-6/18 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Harry Eichler | eichle001har | 1900 | 7/2-7/11 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Kid Elberfeld | elberf001nor | 1900 | 4/19-9/1 | Detroit Tigers | American League | Detroit, MI | |
| Elbert | elbert001--- | 1900 | 6/23-6/24 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Edwin Elliott | elliot005cha | 1900 | Kingston ON | Independent | Kingston, ON | ||
| Ellis | ellis-016--- | 1900 | 8/2 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Ben Ellis | ellis-003ben | 1900 | 5/11-9/7 | Utica Reds | New York State League | Utica, NY | |
| Eli Ellis | ellis-001eli | 1900 | Walden HS | High School | , | ||
| Charles Elsey | elsey-001cha | 1900 | 92 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Bert Eltom | eltom-001alb | 1900 | 5/10-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Bones Ely | ely---001wil | 1900 | 4/19-10/13 | 130 g. | Pittsburgh | National League | Pittsburgh, PA |
| Jack Ely | ely---001joh | 1900 | +5/15-7/19 | Schenectady Electricians | New York State League | Schenectady, NY | |
| George Engel | engel-002geo | 1900 | Cinccinnati Shamrocks | Independent | Cincinnati, OH | ||
| Darby Enroughty | darby-001e-- | 1900 | Anderson | Independent | Anderson, SC | ||
| Clyde Enslow | enslow001cly | 1900 | no g. | New London Whalers | Connecticut State League | New London, CT | |
| Clyde Enslow | enslow001cly | 1900 | 8/19-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Clyde Enslow | enslow001cly | 1900 | 8/25-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Dan Erek | ereck-001dan | 1900-05 | , | ||||
| Duke Esper | esper-001duk | 1900 | Camden | Independent | Camden, NJ | ||
| Frank Eustace | eustac003fra | 1900 | 5/14-5/31 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Frank Eustace | eustac003fra | 1900 | 6/7-8/13 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Frank Eustace | eustac003fra | 1900 | 8/21-9/8 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Evans | evans-007--- | 1900 | Slatington PA | Slatington, PA | |||
| Evans | evans-006--- | 1900 | +8/23-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Evans | evans-004--- | 1900 | 9/7 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Griff Evans | evans-001gri | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Griff Evans | evans-001gri | 1900 | -6/18 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Griff Evans | evans-001gri | 1900 | Phil.-Athletics | Independent | Philadelphia, PA | ||
| Roy Evans | evans-001roy | 1900 | 4/26-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Will Evans | evans-004wil | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Will Evans | evans-004wil | 1900 | 8/5-9/3 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Will Evans | evans-004wil | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| William Evans | evans-013wil | 1900 | 5/4-5/31 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Bill Everitt | everet001wil | 1900 | 4/19-5/16 | 23 g. | Chicago | National League | Chicago, IL |
| Jack Evers | evers-001joh | 1900 | 7/31 | Albany Senators | New York State League | Albany, NY | |
| Jack Evers | evers-001joh | 1900 | 8/2-8/30 | Troy Washerwomen | New York State League | Troy, NY | |
| Bert Everson | everso001a-- | 1900 | no g. | Brooklyn | National League | Brooklyn, NY | |
| Bert Everson | everso001a-- | 1900 | +10/20+ | Chester | Independent | Chester, PA | |
| Bob Ewing | ewing-001geo | 1900 | 4/29-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Buck Ewing | ewing-001buc | 1900 | New York | National League | New York, NY | ||
| Cal Ewing | ewing-001cal | 1900 | 4/1-12/1 | Oakland Oaks | California League | Oakland, CA | |
| Elwood Eyler | eyler-001elw | 1900 | 5/5-9/4 | Denver Grizzlies | Western League | Denver, CO | |
| Fahey | 1900 | Richmond Blue Birds | Virginia League | Richmond, VA | |||
| Fahey | 1900 | no g. | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | ||
| Tom Farley | farley001tho | 1900 | 2 g. | Decatur Commodores | Central League | Decatur, IL | |
| Alex Farmer | farmer001ale | 1900 | 6/6-6/23 | New London Whalers | Connecticut State League | New London, CT | |
| Farnum | farnum003--- | 1900 | 5/15- | Binghamton Crickets | New York State League | Binghamton, NY | |
| Farr | farr--002--- | 1900 | 7 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Farr | farr--002--- | 1900 | 1 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Farrell | farrel054--- | 1900 | 7/20-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Duke Farrell | farrel002cha | 1900 | 5/1-10/13 | 76 g. | Brooklyn | National League | Brooklyn, NY |
| John Farrell | farrel006joh | 1900 | 4/19-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Johnny Farrell | 1900 | 12 g. | Hanford | San Joaquin | Hanford, CA | ||
| W.E. Farrow | farrow001w-- | 1900 | 7 g. | San Diego | Southern California League | San Diego, CA | |
| W.E. Farrow | farrow001w-- | 1900 | 3 g. | Oakland Oaks | California League | Oakland, CA | |
| Clay Fauver | fauver001cla | 1900 | 5/7-7/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Charles Fay | 1900 | 13 g. | Derby Angels | Connecticut State League | Derby, CT | ||
| Fear | fear--001--- | 1900 | 5/22- | 7 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Harry Felix | felix-001har | 1900 | 4/26-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| Matthias Fennell | fennel001mat | 1900 | Elmi.-FatherMathew | Independent | Elmira, NY | ||
| Bill Fenner | fenner000bil | 1900 | +4/15+ | N. Carolina State | College | , | |
| Bill Fenner | fenner000bil | 1900 | 6/28-7/17+ | Wilmington | North Carolina Association | Wilmington, NC | |
| Bob Ferguson | fergus002bob | 1900 | 15 g. | Hanford | San Joaquin | Hanford, CA | |
| Charlie Ferguson | fergus002cha | 1900 | 5/8-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Frank Ferguson | fergus001fra | 1900 | 4/30- | Scranton Miners | Atlantic League | Scranton, PA | |
| Frank Ferguson | fergus001fra | 1900 | Jersey City City | Atlantic League | Jersey City, NJ | ||
| Frank Ferguson | fergus001fra | 1900 | -6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Frank Ferguson | fergus001fra | 1900 | -9/23 | 18 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Guillermo Fernandez | fernan001gui | 1900 | Cubano | Cuban League | , | ||
| Win Ferrin | ferrin001win | 1900 | +7/29+ | SLC-RioGrandeRR | Independent | , | |
| George Ferris | ferris001geo | 1900-06 | No. Illinois U. | College | , | ||
| George Ferris | ferris001geo | 1900 | 9 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| George Ferris | ferris001geo | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| George Ferris | ferris001geo | 1900 | 6/26-7/10 | Omaha Omahogs | Western League | Omaha, NE | |
| Hobe Ferris | ferris001alb | 1900 | 5/10-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Cy Ferry | ferry-001alf | 1900-03 | Manhattan Col. | College | , | ||
| Ed Fertsch | fertsc001edw | 1900 | 5/1-5/30 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Ed Fertsch | fertsc001edw | 1900 | 6/8-6/21 | Buffalo Bisons | American League | Buffalo, NY | |
| Ed Fertsch | fertsc001edw | 1900 | New London Whalers | Connecticut State League | New London, CT | ||
| Ed Fertsch | fertsc001edw | 1900 | 7/20-7/30 | New Castle Quakers | Interstate League | New Castle, PA | |
| Jim Field | field-001jim | 1900 | 4/30-5/30 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Jack Fifield | fifiel001jac | 1900 | 4/28-5/21 | Detroit Tigers | American League | Detroit, MI | |
| Frank Figgemeier | figgem002fra | 1900 | 4/30-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Jack Fillman | fillma001joh | 1900 | no g. | Detroit Tigers | American League | Detroit, MI | |
| Billy Finn | finn--001wil | 1900 | Asbury Park | Independent | Asbury Park, NJ | ||
| Mickey Finn | finn--001duk | 1900 | 4/28- | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Al. Fischer | 1900 | Muncie | Indiana State League | Muncie, IN | |||
| Al. Fischer | 1900 | Michigan City | Michigan City, MI | ||||
| Fisher | fisher024--- | 1900 | +5/10+ | Muncie | Indiana State League | Muncie, IN | |
| Fisher | fisher008--- | 1900 | 9/14 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Chauncey Fisher | fisher005cha | 1900 | 5/3-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Harry Fisher | fisher004har | 1900 | Homestead | Independent | Homestead, PA | ||
| Harry Fisher | fisher006har | 1900 | Lancaster Actives | Independent | Lancaster, PA | ||
| Ike Fisher | fisher001ike | 1900 | 4/19-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Tom Fisher | fisher002tho | 1900 | 46 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Tom Fisher | fisher001tho | 1900 | Loui.-Nicely | Independent | Louisville, KY | ||
| Fiske | 1900 | Trinity College | College | , | |||
| Frank Fitch | fitch-002fra | 1900 | Rossland B. C. | Independent | Rossland, BC | ||
| Frank Fitch | fitch-002fra | 1900 | 8/19- | 7 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Walter Fitz | 1900 | NC | , | ||||
| Fitzgerald | fitzge037--- | 1900 | 7/11+ | Durham Bulls | North Carolina Association | Durham, NC | |
| Billy Fitzmaurice | fitzma001wil | 1900 | 5/14-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Frank Fitzpatrick | fitzpa001fra | 1900 | 5/10-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Tom Fitzpatrick | fitzpa001tho | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Pat Flaherty | flaher005pat | 1900 | 5/12-6/19 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Patsy Flaherty | flaher004pat | 1900 | 4/22-5/26 | 4 g. | Pittsburgh | National League | Pittsburgh, PA |
| Patsy Flaherty | flaher004pat | 1900 | 6/24-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Steamer Flanagan | flanag003jam | 1900-05 | Notre Dame | College | , | ||
| Thomas Flanagan | flanag001tho | 1900 | 5/2-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Jack Flannery | flanne001joh | 1900 | 5/22-9/23 | Helena Senators | Montana State League | Helena, MT | |
| Ben Fleishman | fleish001ben | 1900 | 4/30-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Fleming | flemin002--- | 1900 | 7/27 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Patrick Fleming | flemin000pat | 1900 | Attleboro | Independent | Attleboro, VT | ||
| Tom Fleming | flemin003tho | 1900 | 4/30-5/30 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Tom Fleming | flemin003tho | 1900 | 6/4-9/22 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Elmer Flick | flick-001elm | 1900 | 4/19-10/13 | 138 g. | Philadelphia | National League | Philadelphia, PA |
| John Flood | flood-001joh | 1900 | -10/14 | Canton | Independent | Canton, OH | |
| Tim Flood | flood-001tim | 1900 | 4/19-5/7 | Buffalo Bisons | American League | Buffalo, NY | |
| Tim Flood | flood-001tim | 1900 | 6/2-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Jack Flournoy | flourn001joh | 1900 | 4/28-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| George Flynn | flynn-003geo | 1900 | 4/20-7/19 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| George Flynn | flynn-003geo | 1900 | 7/30-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Mike Flynn | flynn-002mic | 1900 | 5/22- | 6 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Mike Flynn | flynn-002mic | 1900 | 6 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Horace Fogel | fogel-001hor | 1900 | President | Atlantic League | , | ||
| Foley | foley-014--- | 1900 | 6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Patrick Foley | foley-002pat | 1900 | 5/4-6/14 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Patrick Foley | foley-002pat | 1900 | 8/8-9/5 | New London Whalers | Connecticut State League | New London, CT | |
| Patrick Foley | foley-002pat | 1900 | 5/4-6/14 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Charlie Folger | 1900 | Hobart College | College | , | |||
| Charlie Folger | 1900 | Morovia | Independent | Morovia, NY | |||
| Candido Fontanals | fontan000can | 1900 | San Francisco | Cuban League | , | ||
| Eusebio Fontanals | fontan000eus | 1900 | San Francisco | Cuban League | , | ||
| Robert Footes | footes000rob | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | ||
| Eddie Ford | ford--001edw | 1900 | 1 g. | Oakland Oaks | California League | Oakland, CA | |
| Ed Forde | forde-001--- | 1900 | +5/26+ | Grand Forks | Independent | Grand Forks, ND | |
| Frank Foreman | forema001fra | 1900 | 5/1-7/8 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Frank Foreman | forema001fra | 1900 | 7/14-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| John Foreman | forema001bro | 1900 | 5/22-6/13 | Toronto Canucks | Eastern League | Toronto, ON | |
| James Forman | forman000jim | 1900 | +5/4+ | U. of Alabama | College | , | |
| Kid Forney | forney001j-- | 1900 | +4/14+ | Oxford KS | Independent | Oxford, KS | |
| Kid Forney | forney001j-- | 1900 | Winfield | Independent | Winfield, KS | ||
| Kid Forney | forney001j-- | 1900 | 6/6- | Arkansas City | Independent | Arkansas City, KS | |
| Kid Forney | forney001j-- | 1900 | Eureka | Independent | Eureka, KS | ||
| Clarence Foster | foster001cla | 1900 | 4/21-5/8 | 31 g. | New York | National League | New York, NY |
| Clarence Foster | foster001cla | 1900 | 5/12-6/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Clarence Foster | foster001cla | 1900 | 7/18-10/13 | 31 g. | New York | National League | New York, NY |
| Fred Foster | foster002fre | 1900 | 4/30-5/15 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Reddy Foster | foster001red | 1900 | 5/4-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Reddy Foster | foster001red | 1900 | 6/22-7/7 | Hampton Crabs | Virginia League | Hampton, VA | |
| Reddy Foster | foster001red | 1900 | +7/16-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Frank Foutz | foutz-001fra | 1900 | 5/9-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Bill Fox | fox---006wil | 1900 | 5/11-9/8 | Rome Romans | New York State League | Rome, NY | |
| Charley Fox | fox---003cha | 1900 | +8/14+ | Muskegon Reds | Independent | Muskegon, MI | |
| George Fox | fox---001pad | 1900 | 4/30-5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| George Fox | fox---001pad | 1900 | 6/6-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Jim Fox | fox---001jam | 1900 | 6/25-8/2 | Statesville | North Carolina Association | Statesville, NC | |
| John Fox | fox---001joh | 1900 | +4/30+ | Guilford College | College | , | |
| John Fox | fox---001joh | 1900 | 6/25-7/31+ | Statesville | North Carolina Association | Statesville, NC | |
| William Fox | fox---009wil | 1900 | 8/8-8/24 | New London Whalers | Connecticut State League | New London, CT | |
| Leon Foy | foy---002leo | 1900 | Elkhart IN | Independent | Elkhart, IN | ||
| France | france002--- | 1900 | 7/14 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| France | france002--- | 1900 | 7/18-8/10 | Gouverneur | Northern New York League | Gouverneur, NY | |
| E. E. France | 1900 | Kent | Independent | Kent, OH | |||
| Tom Francis | franci001tho | 1900 | 5/2-6/3 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Buck Francks | franck001cha | 1900 | 4/1-12/2 | Oakland Oaks | California League | Oakland, CA | |
| Charlie Frank | frank-003cha | 1900 | Memphis | Independent | Memphis, TN | ||
| Fred Frank | frank-003fre | 1900 | 4/28-7/5 | Dayton Veterans | Interstate League | Dayton, OH | |
| Fred Frank | frank-003fre | 1900 | 7/8-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Jim Franklin | frankl004jam | 1900 | Buffalo Bisons | American League | Buffalo, NY | ||
| Ralph Frary | frary-001ral | 1900 | +6/4+ | Scotland SD | Independent | Scotland, SD | |
| Chick Fraser | fraser001cha | 1900 | 4/20-10/06 | 29 g. | Philadelphia | National League | Philadelphia, PA |
| William Frazee | frazee001wil | 1900 | 5/-5/ | Utica Reds | New York State League | Utica, NY | |
| William Frazee | frazee001wil | 1900 | +6/8 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Frazer | frazer002--- | 1900 | no g. | Elmira | Elmira, NY | ||
| Dotty Freck | freck-001cha | 1900 | Painesville | Independent | Painesville, OH | ||
| Lute Freeland | freela001lut | 1900 | 5/10- | London Tecumsehs | International League | London, ON | |
| Lute Freeland | freela001lut | 1900 | -7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Lute Freeland | freela001lut | 1900 | Hamilton Hams | International League | Hamilton, ON | ||
| Lute Freeland | freela001lut | 1900 | 8/11-9/4 | Omaha Omahogs | Western League | Omaha, NE | |
| Freeman | freema014--- | 1900 | 4/30-5/3 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Buck Freeman | freema003joh | 1900 | 4/19-10/12 | 117 g. | Boston | National League | Boston, MA |
| Hon Fricken | fricke001ant | 1900 | 5/13-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Bill Friel | friel-001wil | 1900 | 6/7-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Danny Friend | friend002dan | 1900 | 4/27-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Fries??? | 1900 | 27 g. | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Charlie Frisbee | frisbe001cha | 1900 | 4/19-5/13 | 4 g. | New York | National League | New York, NY |
| Charlie Frisbee | frisbe001cha | 1900 | 6/25-8/27 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Emil Frisk | frisk-001joh | 1900 | 4/25-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Edward Frome | from--002edw | 1900 | Hiram College | College | , | ||
| Edward Frome | from--002edw | 1900 | 7/13-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Jesse Frysinger | frysin001jes | 1900 | Chester | Independent | Chester, PA | ||
| Pearly Fugler | fugler000pea | 1900 | Jefferson Military | PrepSchool | , | ||
| Pearly Fugler | fugler000pea | 1900-01 | Vanderbilt Univ. | College | , | ||
| Charles Fuller | fuller003cha | 1900 | +5/6-6/8 | Wabash | Indiana State League | Wabash, IN | |
| Charles Fuller | fuller003cha | 1900 | 25 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| W.H. Fuller | fuller005w-- | 1900 | 6 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| W.H. Fuller | fuller005w-- | 1900 | 4 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Fulmer | fulmer002--- | 1900 | 5/10-5/17 | Chatham Reds | International League | Chatham, ON | |
| Dave Fultz | fultz-001dav | 1900 | 4/21-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| John Fyanes | faynes001joh | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Robert Gaines | gaines000bob | 1900-02 | Univ. Nebraska | College | , | ||
| Gallagher | gallag019--- | 1900 | 5/14- | Scranton Miners | Atlantic League | Scranton, PA | |
| Gallagher | gallag019--- | 1900 | -5/31 | Elmira | Atlantic League | Elmira, NY | |
| Andy Gallagher | gallag001and | 1900 | 5/5-5/10 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Andy Gallagher | gallag001and | 1900 | 6/13-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| Marty Gallagher | gallag001mar | 1900 | 8/29-9/8 | Albany Senators | New York State League | Albany, NY | |
| Shorty Gallagher | gallag005cha | 1900 | 5/10-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Bill Galloway | gallow003wil | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Bob Ganley | ganley002rob | 1900 | +5/20-9/8 | Albany Senators | New York State League | Albany, NY | |
| Bill Gannon | gannon002wil | 1900 | -9/8 | 107 g. | Cortland Wagonmakers | New York State League | Cortland, NY |
| Gussie Gannon | gannon001gus | 1900 | 5/2-5/30 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Billy Ganss | gans--001bil | 1900 | +10/7+ | Cleveland Brooklyns | Independent | Cleveland, OH | |
| Joe Ganzel | ganzel001jos | 1900 | Ionia MI | Independent | Ionia, MI | ||
| John Ganzel | ganzel001joh | 1900 | 4/19-5/17 | Kansas City Blues | American League | Kansas City, MO | |
| John Ganzel | ganzel001joh | 1900 | 5/19-10/13 | 78 g. | Chicago | National League | Chicago, IL |
| Antonio Maria Garcia | garcia011ant | 1900 | Almendarista | Cuban League | , | ||
| George Gardner | gardne001geo | 1900 | Wallingford | Independent | Wallingford, CT | ||
| Jim Gardner | gardne001jam | 1900 | 4/23-9/17 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Willie Garoni | garoni001wil | 1900 | no g. | New York | National League | New York, NY | |
| Al Garrett | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | |||
| Jim Garry | garry-001jim | 1900 | 4/21-7/5 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Jim Garry | garry-001jim | 1900 | 7/8-8/16 | Buffalo Bisons | American League | Buffalo, NY | |
| Jim Garry | garry-001jim | 1900 | 8/23-9/15 | Montreal Royals | Eastern League | Montreal, QC | |
| Roger Garten | 1900 | Denver Grizzlies | Western League | Denver, CO | |||
| John Garvan | 1900-02 | Yale University | College | , | |||
| John Garvan | 1900 | Paul Smith’s | Independent | , | |||
| Peter Garvey | garvey001pet | 1900 | +5/15 | Wabash | Indiana State League | Wabash, IN | |
| Peter Garvey | garvey001pet | 1900 | 5/16-5/20+ | Kokomo | Indiana State League | Kokomo, IN | |
| Leo Garvin | garvin001lee | 1900 | +7/21+ | Sedalia | Independent | Sedalia, MO | |
| Ned Garvin | garvin001vir | 1900 | 4/22-10/11 | 30 g. | Chicago | National League | Chicago, IL |
| Welcome Gaston | gaston002wel | 1900 | 4/24-6/9 | Detroit Tigers | American League | Detroit, MI | |
| Welcome Gaston | gaston002wel | 1900 | 6/28 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Welcome Gaston | gaston002wel | 1900 | 8/12-9/10 | Dayton Veterans | Interstate League | Dayton, OH | |
| Ernest Gates | gates-001ern | 1900 | 5/1-7/9 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Frank Gatins | gatins001fra | 1900 | 4/26-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| E. Gauding | gaudin001e-- | 1900 | 7 g. | Azusa | Southern California League | Azusa, CA | |
| E. Gauding | gaudin001e-- | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Gus Geager | geager001gus | 1900 | +5/24- | Utica Reds | New York State League | Utica, NY | |
| Gus Geager | geager001gus | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Dale Gear | gear--001dal | 1900 | 4/21-9/15 | Kansas City Blues | American League | Kansas City, MO | |
| George Geer | geer--001geo | 1900 | , | ||||
| Phil Geier | geier-001phi | 1900 | 4/23-5/27 | 30 g. | Cincinnati | National League | Cincinnati, OH |
| Phil Geier | geier-001phi | 1900 | 6/28-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Phil Geier | geier-001phi | 1900 | 9/21-10/14 | 30 g. | Cincinnati | National League | Cincinnati, OH |
| Gustavo Gelabert | gelabe000gus | 1900 | Almendarista | Cuban League | , | ||
| Frank Genins | genins001c-- | 1900 | 4/20-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Doc Gessler | gessle001har | 1900-01 | Wash. & Jeff. Col. | College | , | ||
| Charlie Gettig | gettig002cha | 1900 | no g. | Chicago White Stockings | American League | Chicago, IL | |
| Tom Gettinger | gettin001tom | 1900 | 5/11-6/15 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Jake Gettman | gettma001jac | 1900 | 4/19-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| Ollie Gfroerer | gfroer001oli | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Ollie Gfroerer | gfroer001oli | 1900 | Memphis | Southern League | Memphis, TN | ||
| Charles Gibbons | 1900 | Pawtucket | Independent | Pawtucket, RI | |||
| Charles Gibbons | 1900 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |||
| Elmer Gibbs | gibbs-001elm | 1900 | 7 g. | San Diego | Southern California League | San Diego, CA | |
| James Giblin | giblin001jam | 1900 | 5/10-9/6 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Norwood Gibson | gibson001nor | 1900 | Notre Dame University | College | , | ||
| Norwood Gibson | gibson001nor | 1900 | 6/21 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Norwood Gibson | gibson001nor | 1900 | 8/19-9/17 | Kansas City Blues | American League | Kansas City, MO | |
| Ralph Gibson | gibson001ral | 1900 | 6/12-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Frank Gierhardt | 1900 | 6/3- | Ogden | Independent | Ogden, UT | ||
| Al Gifford | giffor001al- | 1900 | 5/?-5/? | Utica Reds | New York State League | Utica, NY | |
| Billy Gilbert | gilber002wil | 1900 | 4/26-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Hermie Gilbert | gilber002her | 1900 | 2 g. | Hanford | San Joaquin | Hanford, CA | |
| Hermie Gilbert | gilber002her | 1900 | 3 g. | Fresno | San Joaquin | Fresno, CA | |
| Jack Gilbert | gilber005joh | 1900 | 4/28-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Jack Gilbert | gilber005joh | 1900 | 8/5-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Bob Gilks | gilks-001rob | 1900 | 5/10-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| George Gillespie | 1900 | 3 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Frank Gilliam | gillia001fra | 1900 | 8/17-9/2 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Eddie Gilligan | gillig001edw | 1900 | 4/30-7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Eddie Gilligan | gillig001edw | 1900 | +7/16-7/17 | Durham Bulls | North Carolina Association | Durham, NC | |
| Eddie Gilligan | gillig001edw | 1900 | 7/20-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Thomas Gilligan | gillig001tho | 1900 | 4/30-6/7 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Thomas Gilligan | gillig001tho | 1900 | 6/15-7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Thomas Gilligan | gillig001tho | 1900 | +7/16-7/30+ | Durham Bulls | North Carolina Association | Durham, NC | |
| George Gillpatrick | gillpa001geo | 1900 | 4/30-9/11 | Dayton Veterans | Interstate League | Dayton, OH | |
| Gilmore | gilmor002--- | 1900 | 12 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Gilmore | gilmor002--- | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Frank Gimlin | gimlin001joh | 1900 | +6/3+ | Ogden | Independent | Ogden, UT | |
| Billy Ging | ging--001bil | 1900 | 4/26-5/1 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Billy Ging | ging--001bil | 1900 | Athens | Semi-professional | Athens, PA | ||
| Billy Ging | ging--001bil | 1900 | 8/23 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Ginley | ginley001--- | 1900 | Binghamton Crickets | New York State League | Binghamton, NY | ||
| William Ginley | ginley001wil | 1900 | 5/12- | 19 g. | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY |
| Hollis Gitchell | gitche001hol | 1900 | Binghamton Crickets | New York State League | , NY | ||
| Fred Glade | glade-001fre | 1900 | 22 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Jack Glasscock | glassc001jac | 1900 | 4/28-5/12 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Jack Glasscock | glassc001jac | 1900 | 6/7-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Harry Gleason | gleaso001har | 1900 | 4/28-6/6 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Harry Gleason | gleaso001har | 1900 | 6/14-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Kid Gleason | gleaso002wil | 1900 | 4/19-9/15 | 111 g. | New York | National League | New York, NY |
| Kid Gleason | gleaso000kid | 1900 | 5/11-6/4 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Thomas Gleason | 1900 | Umpire | Atlantic League | , | |||
| William Gleason | gleaso001wil | 1900 | +8/14+ | Muskegon Reds | Independent | Muskegon, MI | |
| Bob Glenalvin | glenal001bob | 1900 | , | ||||
| Dick Glendon | glendo001ric | 1900 | 8/23-9/4 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Ed Glenn | glenn-001edw | 1900 | 4/28-6/12 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Ed Glenn | glenn-001edw | 1900 | Memphis | Independent | Memphis, TN | ||
| Ed Glenn | glenn-001edw | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Glennon | glenno002--- | 1900 | 2 g. | Danville Champions | Central League | Danville, IL | |
| Jot Goar | goar--001jot | 1900 | 4/21-7/9 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| John Gochnaur | gochna001joh | 1900 | 4/28-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| Johnny Gonding | gondin001joh | 1900 | 4/19-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Braulio Gonzalez | gonzal000bra | 1900 | Habana | Cuban League | , | ||
| Florentino Gonzalez | gonzal003flo | 1900 | Cubano | Cuban League | , | ||
| Francisco Gonzalez | gonzal020fra | 1900 | Almendarista | Cuban League | , | ||
| Valentin Gonzalez | gonzal001val | 1900 | Habana | Cuban League | , | ||
| Doc Goodell | goodal001doc | 1900 | no g. | St. Joseph Saints | Western League | St. Joseph, MO | |
| Tom Goodhart | goodha001tom | 1900 | Lancaster Actives | Independent | Lancaster, PA | ||
| Alex Goodman | goodma001ale | 1900 | 1 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Goodwin | 1900 | 6/26-6/28 | Norwich Witches | Connecticut State League | Norwich, CT | ||
| Art Goodwin | goodwi001art | 1900 | 5/1-6/6 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Art Goodwin | goodwi001art | 1900 | 6/27-9/8 | Utica Reds | New York State League | Utica, NY | |
| Eddie Gordon | gordon002a-- | 1900-02 | U. Nebraska | College | , | ||
| Roger Gorton | gorton001rog | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Roger Gorton | gorton001rog | 1900 | 22 g. | Peoria Distillers | Central League | Peoria, IL | |
| Gougie | gougie001--- | 1900 | 8/3 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| William Gould | gould-004wil | 1900 | 5/2 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Ramon Govantes | govant000ram | 1900 | San Francisco | Cuban League | , | ||
| Mike Grady | grady-002mic | 1900 | 4/19-10/13 | 83 g. | New York | National League | New York, NY |
| William Graffius | graffi001wil | 1900 | 4/28-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Charlie Graham | graham002cha | 1900 | Santa Clara Univ. | College | , | ||
| Charlie Graham | graham002cha | 1900 | 100 g. | Pueblo Indians | Western League | Pueblo, CO | |
| Charlie Graham | graham002cha | 1900 | -12/2 | 27 g. | Stockton Wasps | California League | Stockton, CA |
| George Graham | graham003geo | 1900 | 6/25-6/29+ | Durham Bulls | North Carolina Association | Durham, NC | |
| Moonlight Graham | graham001arc | 1900-03 | U. of North Carolina | College | , | ||
| Moonlight Graham | graham001arc | 1900 | 6/25-6/29+ | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Moonlight Graham | graham001arc | 1900 | Durham Bulls | North Carolina Association | Durham, NC | ||
| Oscar Graham | graham001osc | 1900 | no g. | Omaha Omahogs | Western League | Omaha, NE | |
| Grandigel | grandi002--- | 1900 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | ||
| Grant | 1900 | South Bend Greens | Independent | South Bend, IN | |||
| Angus Grant | grant-001ang | 1900 | +8/14+ | South Bend | Independent | South Bend, IN | |
| Charlie Grant | grant-003cha | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | ||
| Frank Grant | grant-001fra | 1900 | +5/13+ | Genuine Cuban Giants | Independent | Genuine, | |
| Frank Grant | grant-001fra | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Frank Grant | grant-001fra | 1900 | Cuban Giants | Black Baseball | , | ||
| Frank Grant | grant-001fra | 1900 | Cuban X Giants | Black Baseball | , | ||
| Frank Grant | grant-001fra | 1900 | +5/3+ | Cuban Giants | Black Baseball League | Cuban, | |
| George Grant | grant-003geo | 1900 | 4/30-6/11 | Elmira | Atlantic League | Elmira, NY | |
| George Grant | grant-003geo | 1900 | 7/30-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Pat Graves | graves000pat | 1900 | U. North Carolina | College | , | ||
| Pat Graves | graves000pat | 1900 | 6/25-6/28 | Durham Bulls | North Carolina Association | Durham, NC | |
| Gray | gray--038--- | 1900 | +5/16+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Gray | gray--003--- | 1900 | 22 g. | Peoria Distillers | Central League | Peoria, IL | |
| Bill Gray | gray--001bil | 1900 | 4/27-6/19 | Detroit Tigers | American League | Detroit, MI | |
| Bill Gray | gray--001bil | 1900 | 6/26-7/15 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Billy Gray | gray--004bil | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Chummy Gray | gray--001chu | 1900 | 5/12 | Buffalo Bisons | American League | Buffalo, NY | |
| Chummy Gray | gray--001chu | 1900 | 6/26-8/17 | Kansas City Blues | American League | Kansas City, MO | |
| Green | green-005--- | 1900 | NYSt | , | |||
| Green | green-005--- | 1900 | +6/28-6/29+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Danny Green | green-001edw | 1900 | 4/29-10/13 | 103 g. | Chicago | National League | Chicago, IL |
| James Green | green-010jam | 1900 | 5/9-5/23 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| James Green | green-010jam | 1900 | 5/25-6/9 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Johnny Green | green-001joh | 1900 | 5/5-5/11 | St. Joseph Saints | Western League | St. Joseph, MO | |
| A.V. Greene | greene001a-- | 1900 | Rock Rapids | Independent | Rock Rapids, IA | ||
| Doc Greenwald | greenw001doc | 1900 | +5/6+ | Anderson | Indiana State League | Anderson, IN | |
| Doc Greenwald | greenw001doc | 1900 | South Bend Greens | Independent | South Bend, IN | ||
| Jack Greenwell | greenw003joh | 1900 | +6/3+ | Ogden | Independent | Ogden, UT | |
| William Greer | greer-001wil | 1900 | 5/9-5/22 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Gregory | gregor011--- | 1900 | 4/25-5/19 | New Castle Quakers | Interstate League | New Castle, PA | |
| Gregory | gregor003--- | 1900 | 1 g. | Springfield/Jacksonville | Central League | Jacksonville, IL | |
| Ed Gremminger | gremmi001lor | 1900 | 4/26-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Reddy Grey | grey--001rom | 1900 | 4/28-5/31 | Toronto Canucks | Eastern League | Toronto, ON | |
| Reddy Grey | grey--001rom | 1900 | 7/11-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Griffin | griffi056--- | 1900 | 7/9 | New Castle Quakers | Interstate League | New Castle, PA | |
| Griffin | griffi053--- | 1900 | Reading Coal Heavers | Atlantic League | Reading, PA | ||
| Jack Griffin | griffi003j-- | 1900 | Holy Cross | College | , | ||
| Percy Griffin | griffi001per | 1900 | 1 g. | Danville Champions | Central League | Danville, IL | |
| Sandy Griffin | griffi001san | 1900 | 4/26-6/30 | Umpire | Eastern League | , | |
| Steve Griffin | griffi001ste | 1900 | 4/28-7/6 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Steve Griffin | griffi001ste | 1900 | 7/26-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Thomas Griffin | griffi007tho | 1900 | 8 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Thomas Griffin | griffi007tho | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Clark Griffith | griffi003cla | 1900 | 4/19-9/29 | 30 g. | Chicago | National League | Chicago, IL |
| Jack Grim | grim--001joh | 1900 | 5/22- | 42 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| John Grim | grim--002joh | 1900 | 4/19-6/14 | Minneapolis Millers | American League | Minneapolis, MN | |
| John Grim | grim--002joh | 1900 | 8/3-8/19 | St. Joseph Saints | Western League | St. Joseph, MO | |
| John Grim | grim--002joh | 1900 | 8/21-9/2 | Umpire | Western League | , | |
| James Grimes | grimes003jam | 1900 | 5/22- | 9 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Steve Grimm | 1900 | no g. | Sioux City Cornhuskers | Western League | Sioux City, IA | ||
| Myron Grimshaw | grimsh001myr | 1900 | 5/10-7/4 | Chatham Reds | International League | Chatham, ON | |
| George Grosart | grossa001geo | 1900 | no g. | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| James Grove | grove-003jam | 1900 | 4/30-5/14 | Elmira | Atlantic League | Elmira, NY | |
| Dan Grubb | 1900 | 10 g. | Fresno | San Joaquin | Fresno, CA | ||
| Dan Grubb | 1900 | 2 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Jim Grubb | 1900 | 1 g. | Visalia | San Joaquin | Visalia, CA | ||
| W. Grubb | 1900 | 2 g. | Fresno | San Joaquin | Fresno, CA | ||
| W. Grubb | 1900 | 10 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Gruenwild | 1900 | So Bend-Green St. | Independent | South Bend, IN | |||
| Jim Guercio | guerci001jim | 1900 | 7 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Raymond Guernsey | 1900 | Yale Univ. | College | , | |||
| Otto Guese | guese-001ott | 1900 | 5/23-6/11 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Whitey Guese | guese-001the | 1900 | 5/2-7/7 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Whitey Guese | guese-001the | 1900 | 7/17-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Whitey Guese | guese-001the | 1900 | 8/10-9/15 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Frank Guest | guest-001fra | 1900 | no g. | Toronto Canucks | Eastern League | Toronto, ON | |
| Frank Guest | guest-001fra | 1900 | Norristown | Independent | Norristown, PA | ||
| William Gump | gump--001wil | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| Olin Gunnett | 1900 | Frostburg MD | Independent | Frostburg, MD | |||
| Joe Gunson | gunson001joe | 1900 | 5/1-5/23 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Guyheen | guyhee001--- | 1900 | 5/2-6/10 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Bob Gwaltney | gwaltn001--- | 1900 | Wake Forest U. | College | , | ||
| Bob Gwaltney | gwaltn001--- | 1900 | +6/2+ | Wilm.-Light Infantry | Independent | , | |
| Bob Gwaltney | gwaltn001--- | 1900 | 6/28-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Clarence Haas | 1900 | Evansv.- | EvanCourier | Evansville, IN | |||
| Herman Habel | habel-001her | 1900 | 5/12-7/4 | Chatham Reds | International League | Chatham, ON | |
| Jim Hackett | hacket001jam | 1900 | 21 g. | Springfield/Jacksonville | Central League | Jacksonville, IL | |
| Tom Hackett | hacket001tho | 1900 | 28 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Tom Hackett | hacket001tho | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Frank Hafford | haffor001fra | 1900 | Tufts College | College | , | ||
| Leo Hafford | haffor001leo | 1900-03 | Tufts College | College | , | ||
| Alf Hagerman | hagerm001alf | 1900 | 5/15-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Peter Hagerty | hagert001pet | 1900 | 4/30-6/11 | Elmira | Atlantic League | Elmira, NY | |
| Peter Hagerty | hagert001pet | 1900 | 66 g. | Decatur Commodores | Central League | Decatur, IL | |
| George Haggerty | hagger001geo | 1900 | 7/14 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Hahn | hahn--009--- | 1900 | 7/26 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Noodles Hahn | hahn--001fra | 1900 | Memphis | Independent | Memphis, TN | ||
| Noodles Hahn | hahn--001fra | 1900 | 4/22-10/13 | 39 g. | Cincinnati | National League | Cincinnati, OH |
| Jess Hale | hale--001jes | 1900 | +5/23-8/6 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Jess Hale | hale--001jes | 1900 | 8/18-8/21 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Ray Hale | hale--001ray | 1900 | 5/14-7/4 | Chatham Reds | International League | Chatham, ON | |
| Haley | haley-003--- | 1900 | 5/1-5/3 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Elliott Hall | 1900 | Wofford College | College | , | |||
| Oscar Hall | hall--001osc | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| Oscar Hall | hall--001osc | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Oscar Hall | hall--001osc | 1900 | 8/5-8/18 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Russ Hall | hall--011rob | 1900 | 5/5-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Russ Hall | hall--011rob | 1900 | 9/8-9/23 | Helena Senators | Montana State League | Helena, MT | |
| Sam Hall | 1900 | 2 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| William Hall | hall--008wil | 1900 | Umpire | Connecticut State League | , | ||
| Jocko Halligan | hallig001joc | 1900 | 4/30-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| Bill Hallman | hallma002wil | 1900 | 4/19-8/12 | Buffalo Bisons | American League | Buffalo, NY | |
| Bill Hallman | hallma001wil | 1900 | 5/5-8/13 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Bill Hallman | hallma001wil | 1900 | 8/18-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Charlie Hamburg | hambur003cha | 1900 | 5/11-7/27 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Charlie Hamburg | hambur003cha | 1900 | 7/30-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Francis Hamer | hamer-000fra | 1900 | 6/26 | Everest KS | Independent | Everest, KS | |
| Billy Hamilton | hamilt006wil | 1900 | 4/19-10/04 | 136 g. | Boston | National League | Boston, MA |
| Billy Hammond | hammon002wil | 1900 | 4/1- | 24 g. | Oakland Oaks | California League | Oakland, CA |
| Billy Hammond | hammon002wil | 1900 | -9/23 | 58 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Eddie Hammond | hammon001edw | 1900 | 5/22-9/23 | Helena Senators | Montana State League | Helena, MT | |
| Jack Handiboe | handib001j-- | 1900 | 5/10-7/4 | Chatham Reds | International League | Chatham, ON | |
| Jack Handiboe | handib001j-- | 1900 | 7/18-7/21 | Albany Senators | New York State League | Albany, NY | |
| Jim Haney | haney-003jam | 1900 | 5/11-6/5 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Chip Hanford | hanfor002cha | 1900 | 4/30-8/26 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Jack Hankey | hankey001joh | 1900 | Omaha Omahogs | Western League | Omaha, NE | ||
| Arthur Hanks | hanks-001art | 1900 | +7/11+ | Chambersburg PA | Independent | Chambersburg, PA | |
| Hanley | hanley001--- | 1900 | 13 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Hanley | hanley001--- | 1900 | Great Falls Indians | Montana State League | Great Falls, MT | ||
| George Hanley | hanley002geo | 1900 | 5/11-9/7 | Rome Romans | New York State League | Rome, NY | |
| James Hanley | hanley002jam | 1900 | Derby Hooks | Amateur | Derby, CT | ||
| James Hanley | hanley002jam | 1900 | 9/5 | Derby Angels | Connecticut State League | Derby, CT | |
| Bill Hanlon | hanlon001wil | 1900 | 4/1-12/2 | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Ned Hanlon | hanlon001ned | 1900 | Brooklyn | National League | Brooklyn, NY | ||
| Tim Hanna | hanna-001tim | 1900 | 5/10-6/9 | New London Whalers | Connecticut State League | New London, CT | |
| James Hannan | hannan002jam | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Pat Hannivan | hanniv001pat | 1900 | 4/28-5/21 | Toronto Canucks | Eastern League | Toronto, ON | |
| Pat Hannivan | hanniv001pat | 1900 | 5/22-8/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Pat Hannivan | hanniv001pat | 1900 | 8/28-9/8 | Rome Romans | New York State League | Rome, NY | |
| Billy Hanrahan | hanrah001wil | 1900 | +6/27+ | Grand Forks | Independent | Grand Forks, ND | |
| Harry Hanrahan | hanrah000har | 1900 | +6/27+ | Grand Forks | Independent | Grand Forks, ND | |
| Jack Hanrahan | hanrah001joh | 1900 | 10 g. | Visalia | San Joaquin | Visalia, CA | |
| Eddie Hanscomb | hansco001edm | 1900 | 5/10 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Eddie Hanscomb | hansco001edm | 1900 | +5/21-6/29 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| George Hanson | hanson001geo | 1900 | no g. | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Scott Hardesty | hardes002sco | 1900 | 4/28-8/12 | Dayton Veterans | Interstate League | Dayton, OH | |
| Lou Hardie | hardie001lou | 1900 | 4/1- | 45 g. | Oakland Oaks | California League | Oakland, CA |
| Hardin | hardin003--- | 1900 | 12 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Alex Hardy | hardy-001dav | 1900 | 5/12-5/16 | Hamilton Hams | International League | Hamilton, ON | |
| Alex Hardy | hardy-001dav | 1900 | 8/1 | Montreal Royals | Eastern League | Montreal, QC | |
| Billy Hargrove | hargro002wil | 1900 | 4/26-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| James Harkins | harkin002jam | 1900 | 5/26 | Hamilton Hams | International League | Hamilton, ON | |
| Neil Harkins | 1900 | Umpire | Atlantic League | , | |||
| Dick Harley | harley001ric | 1900 | 4/19-9/10 | Detroit Tigers | American League | Detroit, MI | |
| Dick Harley | harley001ric | 1900 | 9/15-9/19 | 5 g. | Cincinnati | National League | Cincinnati, OH |
| Con Harlow | harlow001con | 1900 | +5/6- | Muncie | Indiana State League | Muncie, IN | |
| Ira Harmon | harmon001ira | 1900 | Pocotello ID | Independent | Pocatello, ID | ||
| Harmonie | harmon002--- | 1900 | 1 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Harper | harper032--- | 1900 | 5/15 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| George Harper | harper003joh | 1900 | +4/8-12/2 | Stockton Wasps | California League | Stockton, CA | |
| Jack Harper | harper003cha | 1900 | 4/30 | 1 g. | St. Louis | National League | St. Louis, MO |
| Jack Harper | harper003cha | 1900 | 5/16-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Harrell | harrel001--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Joe Harrington | harrin001joe | 1900 | 5/10-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Cebern Harris | harris000ceb | 1900-02 | Cornell Univ. | College | , | ||
| Cebern Harris | harris000ceb | 1900 | 6/25-7/27+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| F. Harris | 1900 | 9 g. | Hanford | San Joaquin | Hanford, CA | ||
| Hank Harris | harris001hen | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Eldred Harrison | harris000eld | 1900 | +7/21-9/20+ | Sedalia | Independent | Sedalia, MO | |
| Hart | hart--003--- | 1900 | 6/18-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Bill Hart | hart--004wil | 1900 | 4/24-9/16 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Jack Hart | hart--001jac | 1900 | 5/12-6/29 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Jimmy Hart | hart--003jam | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Jimmy Hart | hart--003jam | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Jimmy Hart | hart--003jam | 1900 | 8/13-9/17 | Buffalo Bisons | American League | Buffalo, NY | |
| Seth Hart | hart--001set | 1900 | 6 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Thomas Hart | hart--002tho | 1900 | College | , | |||
| Jack Hartley | hartle001jac | 1900 | 4 g. | San Diego | Southern California League | San Diego, CA | |
| Fred Hartman | hartma003fre | 1900 | 4/21-9/16 | Chicago White Stockings | American League | Chicago, IL | |
| William Hartman | hartma001wil | 1900 | 4/28-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| William? Hartman | 1900 | Reading Browns | Independent | Reading, PA | |||
| Topsy Hartsel | hartse001tul | 1900 | 4/20-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Topsy Hartsel | hartse001tul | 1900 | 9/21-10/14 | 18 g. | Cincinnati | National League | Cincinnati, OH |
| Hartwell | 1900 | 4 g. | Hanford | San Joaquin | Hanford, CA | ||
| Josh Hartwell | hartwe001--- | 1900 | 2 g. | Azusa | Southern California League | Azusa, CA | |
| Josh Hartwell | hartwe001--- | 1900 | 2 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Hunter Harvey | harvey001hun | 1900 | 4/30-5/3 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Zaza Harvey | harvey001erv | 1900 | 5/3 | 2 g. | Chicago | National League | Chicago, IL |
| Zaza Harvey | harvey001erv | 1900 | 6/1-9/4 | Minneapolis Millers | American League | Minneapolis, MN | |
| Zaza Harvey | harvey001erv | 1900 | 9/30 | 2 g. | Chicago | National League | Chicago, IL |
| Haskell | haskel001--- | 1900 | 7/12-7/15 | Rome Romans | New York State League | Rome, NY | |
| Earl Haskett | hasket000ear | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Charlie Hastings | hastin002cha | 1900 | 4/21-6/19 | Minneapolis Millers | American League | Minneapolis, MN | |
| Charlie Hastings | hastin002cha | 1900 | 6/26-9/4 | Buffalo Bisons | American League | Buffalo, NY | |
| Bill Hausen | hausen001hom | 1900 | 5/5-5/31 | Denver Grizzlies | Western League | Denver, CO | |
| Bill Hausen | hausen001hom | 1900 | 6/5-7/9 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Bill Hausen | hausen001hom | 1900 | Rock Rapids SD | Independent | Rock Rapids, SD | ||
| Bill Hawke | hawke-001bil | 1900 | +5/13- | Albany Senators | New York State League | Albany, NY | |
| R.L. Hawkins | hawkin000rl- | 1900 | Univ. of Missouri | College | , | ||
| R.L. Hawkins | hawkin000rl- | 1900 | 7 g. | Sedalia | Independent | Sedalia, MO | |
| George Hawley | hawley001geo | 1900 | Rome Romans | New York State League | Rome, NY | ||
| Pink Hawley | hawley001eme | 1900 | 4/21-10/11 | 41 g. | New York | National League | New York, NY |
| Jack Hayden | hayden001joh | 1900 | 5/16-5/17 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Jack Hayden | hayden001joh | 1900 | Chester | Independent | Chester, PA | ||
| Jack Hayden | hayden001joh | 1900 | 7/3-7/14 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Jack Hayden | hayden001joh | 1900 | 7/16- | Atlantic City | Independent | Atlantic City, NJ | |
| Hayes | hayes-027--- | 1900 | Binghamton Crickets | New York State League | Binghamton, NY | ||
| Hayes | hayes-004--- | 1900 | 6/11-6/13 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Bert Hayes | hayes-001ber | 1900 | 1 g. | Stockton Wasps | California League | Stockton, CA | |
| William Hayes | hayes-006wil | 1900 | Rome Romans | New York State League | Rome, | ||
| William Hayes | 1900 | Tamaqua PA | Independent | Tamaqua, PA | |||
| William Hayes | 1900 | no g. | Baltimore | American Association | Baltimore, MD | ||
| Haynes | haynes011--- | 1900 | 1 g. | Oakland Oaks | California League | Oakland, CA | |
| Hazel | hazel-002--- | 1900 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | ||
| Peter Healey | healey001pet | 1900 | 5/26-6/17 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Peter Healey | healey001pet | 1900 | Wheeling Stogies | Interstate League | Wheeling, WV | ||
| William Healey | healey001wil | 1900 | Manhattan Col. | College | , | ||
| William Healey | healey001wil | 1900 | 5/10-5/12 | Derby Angels | Connecticut State League | Derby, CT | |
| Hughie Hearne | hearne001hug | 1900 | 5/11-9/8 | Albany Senators | New York State League | Albany, NY | |
| Al Hecht | hecht-001al- | 1900 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | ||
| George Heckert | hecker001geo | 1900 | York-Penn's’ Park | Independent | York, PA | ||
| George Heckman | heckma001geo | 1900 | 6/15-7/13 | Derby Angels | Connecticut State League | Derby, CT | |
| Jimmie Heffernan | heffer001jam | 1900 | Williams College | College | , | ||
| Emmet Heidrick | heidri001joh | 1900 | 4/19-10/14 | 85 g. | St. Louis | National League | St. Louis, MO |
| Louie Heilbroner | heilbr001lou | 1900 | 8/20-10/14 | g. | St. Louis | National League | St. Louis, MO |
| John Heileman | heilem001joh | 1900 | no g. | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Edward Heimerl | heimer000edw | 1900 | Grand Rapids Boers | International League | Grand Rapids, MI | ||
| Bill Heine | heine-001wil | 1900 | 8/22 | Albany Senators | New York State League | Albany, NY | |
| Pete Heinz | heinz-001pet | 1900 | WaKeenet KS | Independent | WaKeenet, KS | ||
| Percy Held | held--001ric | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Percy Held | held--001ric | 1900 | -12/2 | 59 g. | Oakland Oaks | California League | Oakland, CA |
| Helick | helick001--- | 1900 | +6/8 | Muncie | Indiana State League | Muncie, IN | |
| George Hemming | hemmin002geo | 1900 | 5/3-5/4 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| George Hemming | hemmin002geo | 1900 | 5/11-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Charlie Hemphill | hemphi001cha | 1900 | 5/10-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Frank Hemphill | hemphi001fra | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Frank Hemphill | hemphi001fra | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Frank Hemphill | hemphi001fra | 1900 | 8/6-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Frank Hempleman | hemple001fra | 1900 | 4/30-7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Goodie Henderson | hender001goo | 1900 | 5/30-6/8 | Kokomo | Indiana State League | Kokomo, IN | |
| Hardie Henderson | hender004har | 1900 | Umpire | Atlantic League | , | ||
| Johnny Hendley | hendle001joh | 1900 | 7/21-7/23 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Johnny Hendley | hendle001joh | 1900 | 7/30-9/13 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Henley | 1900 | 7/21-7/23 | Sioux City Cornhuskers | Western League | Sioux City, IA | ||
| Henley | 1900 | 7/30-9/1 | St. Joseph Saints | Western League | St. Joseph, MO | ||
| P. W. Henley | henley000p-- | 1900 | no g. | Bloomington Blues | Central League | Bloomington, IL | |
| Weldon Henley | henley001wel | 1900-01 | Georgia Tech | College | , | ||
| Weldon Henley | henley001wel | 1900 | 7/23-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Joe Hennegar | henneg001jos | 1900 | 4/30-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Joe Hennegar | henneg001jos | 1900 | Anderson | Independent | Anderson, SC | ||
| Eddie Henry | henry-001edw | 1900 | 4/26-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| George Henry | henry-002geo | 1900 | 4/30-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| George Henry | henry-002geo | 1900 | +8/11-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Frank Herbert | herber001fra | 1900 | 29 g. | Decatur Commodores | Central League | Decatur, IL | |
| Jack Herbert | herber003joh | 1900 | 97 g. | Decatur Commodores | Central League | Decatur, IL | |
| Jack Herbert | herber003joh | 1900 | Bloomington Blues | Central League | Bloomington, IL | ||
| Art Herman | herman001art | 1900 | 32 g. | St. Joseph Saints | Western League | St. Joseph, MO | |
| Emilio Hernandez | hernan002emi | 1900 | Almendarista | Cuban League | , | ||
| Javier Hernandez | hernan004j-- | 1900 | Habana | Cuban League | , | ||
| L.S. Hernandez | hernan000ls- | 1900 | Almendarista | Cuban League | , | ||
| Joseph Herndon | herndo001jos | 1900 | 5/10-9/7 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Tom Hernon | hernon001tom | 1900 | 6/27-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| Eddie Herr | herr--002edw | 1900 | no g. | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| John Herwig | herwig001joh | 1900 | 5/6-5/8 | Elmira | Atlantic League | Elmira, NY | |
| Tom Hess | hess--001tho | 1900 | 4/28-6/20 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Mike Heydon | heydon001mic | 1900 | 4/20-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Al Hickey | hickey001alb | 1900 | Denver Grizzlies | Western League | Denver, CO | ||
| Al Hickey | hickey001alb | 1900 | 5/22- | 11 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Al Hickey | hickey001alb | 1900 | +7/4+ | SLC-Rio Grandes | Independent | , | |
| Eddie Hickey | hickey001edw | 1900 | 4/20-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Mike Hickey | hickey001mik | 1900 | 20 g. | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Mike Hickey | hickey001mik | 1900 | 6/14-7/21 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Thomas Hickey | 1900 | President | Western League | , | |||
| Walter Hickey | hickey001wal | 1900 | 97 g. | Denver Grizzlies | Western League | Denver, CO | |
| Charlie Hickman | hickma004cha | 1900 | 4/21-10/13 | 127 g. | New York | National League | New York, NY |
| Rowe Hicks | hicks-001row | 1900 | 7/6-7/11 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Daniel Higgins | higgin001dan | 1900 | 8/18-8/31 | Minneapolis Millers | American League | Minneapolis, MN | |
| Ed High | high--001edw | 1900 | 4/30-5/15 | Hampton Crabs | Virginia League | Hampton, VA | |
| Ed High | high--001edw | 1900 | MD Agricult. Col. | , MD | |||
| William Highfield | highfi001wil | 1900 | Springfield/Jacksonville | Central League | Springfield, IL | ||
| William Highfield | highfi001wil | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| George Hildebrand | hildeb002geo | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Belden Hill | hill--003bel | 1900 | 28 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Bill Hill | hill--002bil | 1900 | 4/30-5/31 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Bill Hill | hill--002bil | 1900 | Brockton | Independent | Brockton, MA | ||
| Bill Hill | hill--002bil | 1900 | 7/10-7/22 | Detroit Tigers | American League | Detroit, MI | |
| Eddie Hill | hill--002edw | 1900 | 5/11-7/18 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Eddie Hill | hill--002edw | 1900 | 7/27-9/8 | Albany Senators | New York State League | Albany, NY | |
| Edward Hill | hill--004edw | 1900 | 5/5-6/8 | Kokomo | Indiana State League | Kokomo, IN | |
| Johnny Hill | hill--009joh | 1900 | Cuban Giants | Black Baseball League | Cuban, | ||
| Johnny Hill | hill--009joh | 1900 | Cuban Giants | Black Baseball | , | ||
| Oscar Hill | hill--001osc | 1900 | +9/7+ | Pottstown PA | Independent | Pottstown, PA | |
| Wiley Hill | hill--012wil | 1900 | , | ||||
| Wiley Hill | hill--012wil | 1900 | , | ||||
| Arthur Hillebrand | hilleb001art | 1900 | Princeton | College | , | ||
| Arthur Hillebrand | hilleb001art | 1900 | +7/30+ | Flandreau | Independent | Flandreau, SD | |
| Homer Hillebrand | hilleb001hom | 1900-02 | Princeton Univ. | College | , | ||
| Ed Hilley | hilley001edw | 1900 | 5/21-5/22 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Hines | hines-003--- | 1900 | 5/10-5/15 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Hunkey Hines | hines-001hun | 1900 | 99 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| John Hinton | hinton001joh | 1900 | Homestead | Independent | Homestead, PA | ||
| Carson Hodge | hodge-001car | 1900 | Camden | Independent | Camden, NJ | ||
| George Hodson | hodson002geo | 1900 | 4/27-5/4 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| George Hodson | hodson002geo | 1900 | 5/11-9/4 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Bill Hoffer | hoffer003wil | 1900 | 4/23-8/31 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Bill Hoffer | hoffer001wil | 1900 | Pueblo Indians | Western League | Pueblo, CO | ||
| Hoffman | 1900 | Chester | Independent | Chester, PA | |||
| Charles Hoffman | hoffma020--- | 1900 | 4/28-6/8 | New Castle Quakers | Interstate League | New Castle, PA | |
| Edward Hoffman | hoffma004har | 1900 | Petersburg Farmers | Virginia League | Petersburg, VA | ||
| Izzy Hoffman | hoffma004har | 1900 | 4/30-5/5 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Izzy Hoffman | hoffma004har | 1900 | 5/17-7/10+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Hogan | hogan-004--- | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Marty Hogan | hogan-002mar | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Bill Hogg | hogg--002wil | 1900 | 8/6 | Pueblo Indians | Western League | Pueblo, CO | |
| George Hogreiver | hogrie001geo | 1900 | 4/20-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Bradley Hogue | hogue-001b-- | 1900 | 4/19-6/9 | U. of the South | College | , | |
| Billy Holland | hollan001bil | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | ||
| Howard Holland | hollan001how | 1900 | 5/7-5/14 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Howard Holland | hollan001how | 1900 | 5/15-5/26 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Howard Holland | hollan001how | 1900 | 5/28-6/1 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Howard Holland | hollan001how | 1900 | Anderson | Independent | Anderson, SC | ||
| Jack Holland | hollan004joh | 1900 | 5/5-9/4 | Denver Grizzlies | Western League | Denver, CO | |
| Wallace Hollingsworth | hollin001wal | 1900 | 4/28-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Ed Holly | holly-002edw | 1900 | 5/20-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Ed Holly | holly-002edw | 1900 | Manistee MI | Independent | Manistee, MI | ||
| Ducky Holmes | holmes003jam | 1900 | 5/5-9/10 | Detroit Tigers | American League | Detroit, MI | |
| Fred Holmes | holmes001fre | 1900 | 5/12-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| James Honeyman | honeym001jam | 1900 | -7/12 | 73 g. | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY |
| James Honeyman | honeym001jam | 1900 | 8/6-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Buck Hooker | hooker001wil | 1900 | 5/4-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Buck Hooker | hooker001wil | 1900 | 6/28-7/16+ | Wilmington | North Carolina Association | Wilmington, NC | |
| Ernest Hooker | hooker001e-- | 1900 | 4/25-6/25 | Buffalo Bisons | American League | Buffalo, NY | |
| Ernest Hooker | hooker001e-- | 1900 | 7/3-7/31 | Toronto Canucks | Eastern League | Toronto, ON | |
| Ernest Hooker | hooker001e-- | 1900 | 8/12-9/17 | Buffalo Bisons | American League | Buffalo, NY | |
| Hopkins | hopkin002--- | 1900 | 5/10-5/16 | Port Huron Tunnelites | International League | Port Huron, MI | |
| George Hopkins | hopkin002geo | 1900 | Chicago Unions | Black Baseball | Chicago, IL | ||
| Lee Hopkins | hopkin001leo | 1900 | Salt Lake City | Rio Grande | Salt Lake City, UT | ||
| Lee Hopkins | hopkin001leo | 1900 | -10/ | Pocatello ID | Independent | Pocatello, ID | |
| William Horan | horan-001wil | 1900 | 7/23-7/31 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Sam Horn | 1900 | U. Maryland | College | , | |||
| Will Horn | horn--004wil | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | ||
| Horrigan | horrig001--- | 1900 | 6/4 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Elmer Horton | horton002elm | 1900 | 4/28-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Wilson Hosmer | hosmer002wil | 1900 | 5/-5/ | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| William Hoster | hoster002wil | 1900 | 5/10 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| William Hoster | hoster002wil | 1900 | 5/23 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Hostetter | 1900 | 14 g. | Visalia | San Joaquin | Visalia, CA | ||
| Dennis Houle | houle-001den | 1900 | Umpire | New York State League | , | ||
| Ed Householder | househ001edw | 1900 | 4/26-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Benjamin Houser | houser001ben | 1900 | Girard College | Academy | , | ||
| Lefty Houtz | houtz-001fre | 1900 | 4/28-5/30 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Lefty Houtz | houtz-001fre | 1900 | 6/18-7/20 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Howard | howard006--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Howard | 1900 | 8/1-8/2 | Hamilton Hams | International League | Hamilton, ON | ||
| Bert Howard | howard002ber | 1900 | , | ||||
| Clinton Howard | howard000cli | 1900 | Selma-Morn.Times | Independent | Selma, AL | ||
| Harry Howell | howell001hen | 1900 | 5/2-10/13 | 22 g. | Brooklyn | National League | Brooklyn, NY |
| Robert Howell | howell001rob | 1900 | Salina | Independent | Salina, KS | ||
| Billy Hoy | hoy---001wil | 1900 | 4/21-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Jimmie Hoy | hoy---002jam | 1900 | 5/5-9/4 | Omaha Omahogs | Western League | Omaha, NE | |
| Joe Hubbard | hubbar002joh | 1900 | 5/14-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Thomas Hudson | hudson001tho | 1900 | 5/11-5/16 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Thomas Hudson | hudson001tho | 1900 | 6/11-7/4 | Chatham Reds | International League | Chatham, ON | |
| Frank Huelsman | huelsm001fra | 1900 | 82 g. | Peoria Distillers | Central League | Peoria, IL | |
| Frank Huelsman | huelsm001fra | 1900 | Danville Champions | Central League | Danville, IL | ||
| Huff | huff--005--- | 1900 | 44 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Huff | huff--005--- | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Miller Huggins | huggin001mil | 1900 | U. of Cincinnati | College | , | ||
| Miller Huggins | huggin001mil | 1900 | Fleischman’s | Independent | Cincinnati, OH | ||
| Hughes | hughes028--- | 1900 | Kokomo | Indiana State League | Kokomo, IN | ||
| Jay Hughes | hughes008jam | 1900 | +4/7-12/2 | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Jay Hughes | hughes008jam | 1900 | 81 g. | Sacramento Gilt Edges | California League | Sacramento, CA | |
| John Hughes | hughes011joh | 1900 | 5/22-9/21 | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Tom Hughes | hughes004tho | 1900 | 5/5-8/29 | Omaha Omahogs | Western League | Omaha, NE | |
| Tom Hughes | hughes004tho | 1900 | 9/7-10/7 | 3 g. | Chicago | National League | Chicago, IL |
| Jim Hughey | hughey001jim | 1900 | 5/28-9/30 | 20 g. | St. Louis | National League | St. Louis, MO |
| Hughley | hughey001--- | 1900 | +5/30-6/3+ | SLC-RioGrandeRR | Independent | , | |
| Hughley | hughey001--- | 1900 | +7/29+ | SLC-Short Line RR | Independent | , | |
| Billy Hulen | hulen-001bil | 1900 | 5/15- | 63 g. | Pueblo Indians | Western League | Pueblo, CO |
| Thomas Huling | huling001tho | 1900 | Greenville | Independent | Greenville, PA | ||
| Julius Hulswede | hulswe000jul | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Rudy Hulswitt | hulswi001rud | 1900 | Portsmouth Boers | Virginia League | Portsmouth, VA | ||
| Rudy Hulswitt | hulswi001rud | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Rudy Hulswitt | hulswi001rud | 1900 | 6/19-7/10+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| William Humphries | humphr004wil | 1900 | 7/14-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| Harry Hunt | hunt--001har | 1900 | 4/30-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| John Hunt | 1900 | 4/26-9/19 | Umpire | Eastern League | , | ||
| George Hurlburt | hurlbu001geo | 1900 | -5/ | 15 g. | Sioux City Cornhuskers | Western League | Sioux City, IA |
| George Hurlburt | hurlbu001geo | 1900 | -9/23 | 57 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Bill Hurley | hurley003wil | 1900 | 5/22-9/23 | Helena Senators | Montana State League | Helena, MT | |
| Jerry Hurley | hurley001jer | 1900 | 5/11-9/8 | Utica Reds | New York State League | Utica, NY | |
| Gus Hurst | hurst-010--- | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Gus Hurst | hurst-010--- | 1900 | 8/20 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Gus Hurst | hurst-010--- | 1900 | 8/23 | New Castle Quakers | Interstate League | New Castle, PA | |
| Tim Hurst | hurst-001tim | 1900 | MLB Umpire | National League | , | ||
| Bert Husting | hustin001ber | 1900 | U. of Wisconsin | College | , | ||
| Bert Husting | hustin001ber | 1900 | 6/17-7/4 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Bert Husting | hustin001ber | 1900 | Arcadia | Independent | Arcadia, WI | ||
| Bert Husting | hustin001ber | 1900 | 8/16-8/24 | 2 g. | Pittsburgh | National League | Pittsburgh, PA |
| Huston | 1900 | U.Pennsylvania | College | , | |||
| Jack Huston | huston001jac | 1900 | 15 g. | Bakersfield | San Joaquin | Bakersfield, CA | |
| Jack Huston | huston001jac | 1900 | -9/23 | 41 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Hutchinson | hutchi014--- | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Ed Hutchinson | hutchi002ed- | 1900 | 4/1-12/2 | Oakland Oaks | California League | Oakland, CA | |
| Ralph Hutchinson | hutchi002ral | 1900 | , | ||||
| Arthur Hutter | 1900 | +7/21+ | Canton-Marine | Independent | Canton, OH | ||
| Elmer Hutton | hutton001--- | 1900 | 4/28- | Lanc.-JollyRovers | Independent | Lancaster, PA | |
| William Hycoop | hycoop000wil | 1900-02 | Kalamazoo Col. | College | , | ||
| Harry Hyde | hyde--000har | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | ||
| Hysinger | 1900 | 12 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Ham Iburg | iburg-001her | 1900 | +4/14-12/1 | San Francisco Brewers | California League | San Francisco, CA | |
| John Innes | 1900 | no g. | New London Whalers | Connecticut State League | New London, CT | ||
| Paul Irmscher | irmsch001pau | 1900 | 7/11-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Arthur Irwin | irwin-001art | 1900 | 4/26-7/21 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Charlie Irwin | irwin-001cha | 1900 | 4/19-10/14 | 87 g. | Cincinnati | National League | Cincinnati, OH |
| John Irwin | irwin-001joh | 1900 | 4/30-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| Thomas Irwin | irwin-004tho | 1900 | 4/28-8/10 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Irwin Isaacs | isaacs001irw | 1900 | 8 g. | Decatur Commodores | Central League | Decatur, IL | |
| Irwin Isaacs | isaacs001irw | 1900 | Bloomington Blues | Central League | Bloomington, IL | ||
| Frank Isbell | isbell001wil | 1900 | 4/21-9/15 | Chicago White Stockings | American League | Chicago, IL | |
| Tom Ivers | ivers-001tho | 1900 | 5/10-7/13 | Derby Angels | Connecticut State League | Derby, CT | |
| Tom Ivers | ivers-001tho | 1900 | 7/19-8/6+ | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Tom Ivers | ivers-001tho | 1900 | 8/15-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Ives | ives--002--- | 1900 | 5/22 | Great Falls Indians | Montana State League | Great Falls, MT | |
| Fred Jacklitsch | jackli001fre | 1900 | 4/30-5/26 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Fred Jacklitsch | jackli001fre | 1900 | 6/6-6/7 | 5 g. | Philadelphia | National League | Philadelphia, PA |
| Fred Jacklitsch | jackli001fre | 1900 | 6/14-8/8 | Minneapolis Millers | American League | Minneapolis, MN | |
| Fred Jacklitsch | jackli001fre | 1900 | 9/6 | 5 g. | Philadelphia | National League | Philadelphia, PA |
| Fred Jacklitsch | jackli001fre | 1900 | 10/12-10/13 | 5 g. | Philadelphia | National League | Philadelphia, PA |
| Bill Jackson | jackso016wil | 1900 | Cuban X Giants | Black Baseball | Cuban, | ||
| Robert Jackson | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | |||
| Will Jackson | jackso016wil | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Jakeway | jakewa001--- | 1900 | 5/20 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Knucks James | james-000knu | 1900 | Cuban Giants | Black Baseball | , | ||
| Jack Jamieson | jamies001jac | 1900 | Arkansas City | Independent | Arkansas City, KS | ||
| Jack Jamieson | jamies001jac | 1900 | Salina | Independent | Salina, KS | ||
| Jack Jarvis | jarvis005wil | 1900 | 29 g. | Peoria Distillers | Central League | Peoria, IL | |
| Jack Jarvis | jarvis005wil | 1900 | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| Rube Jarvis | jarvis000rub | 1900-01 | -6/3 | Co. G, 44th Vol Pvt. | Army | , | |
| Jimmy Jefferson | jeffer002jim | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Jimmy Jefferson | jeffer002jim | 1900 | 3 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Charles Jeffries | jeffri001cha | 1900 | Lancaster Actives | Independent | Lancaster, PA | ||
| Ed Jeffries | jeffri001e-- | 1900 | +6/10-7/6+ | Lancaster Actives | Independent | Lancaster, PA | |
| Jim Jeffries | 1900 | Umpire | Connecticut State League | , | |||
| Jim Jeffries | 1900 | 6/4-exhibit | Umpire | Western League | , | ||
| Jim Jeffries | 1900 | Umpire | Atlantic League | , | |||
| Alban Jenkins | jenkin001alb | 1900 | 6/10 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| George Jennings | jennin001geo | 1900 | 5/10-5/19 | Hamilton Hams | International League | Hamilton, ON | |
| George Jennings | jennin001geo | 1900 | 7/2 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Hughie Jennings | jennin001hug | 1900 | 4/19-10/13 | 115 g. | Brooklyn | National League | Brooklyn, NY |
| Clarence Jessup | jessup001cla | 1900 | 96 g. | Peoria Distillers | Central League | Peoria, IL | |
| Clarence Jessup | jessup001cla | 1900 | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| Jacob Jimerson | jamiso001jac | 1900 | 5/1 | Buffalo Bisons | American League | Buffalo, NY | |
| Jacob Jimerson | jamiso001jac | 1900 | 5/7-5/10 | Scranton Miners | Atlantic League | Scranton, PA | |
| Jacob Jimerson | jamiso001jac | 1900 | 6/17-6/28 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Johnson | johnso082--- | 1900 | 7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Abbie Johnson | johnso002abb | 1900 | 4/26-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| Byron Johnson | johnso001ban | 1900-27 | President | American League | , | ||
| Chappie Johnson | johnso025cha | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | ||
| Grant Johnson | johnso003gra | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | ||
| Thomas Johnson | johnso007tho | 1900 | 59 g. | Pueblo Indians | Western League | Pueblo, CO | |
| Youngy Johnson | johnso002you | 1900 | -12/2 | 14 g. | Stockton Wasps | California League | Stockton, CA |
| A. Johnston | 1900 | +7/2-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | ||
| Bill Johnston | johnst004wil | 1900 | 5/30-5/31 | Elmira | Atlantic League | Elmira, NY | |
| Jim Johnstone | johnst001jim | 1900 | 5/17-5/24 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Jim Johnstone | johnst001jim | 1900 | 5/26-9/16 | Umpire | Interstate League | , | |
| Jones | jones-084--- | 1900 | 4/30-6/6 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Jones | jones-217--- | 1900 | 6/27-7/ | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Jones | jones-215--- | 1900 | +7/6-7/7/= | Wilmington | North Carolina Association | Wilmington, NC | |
| Jones | jones-216--- | 1900 | -8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Jones | jones-010--- | 1900 | 1 g. | Danville Champions | Central League | Danville, IL | |
| Bert Jones | jones-001ber | 1900 | Independent | , | |||
| Bert Jones | jones-001ber | 1900 | Chicago Unions | Black Baseball | Chicago, IL | ||
| Bill Jones | 1900 | CtSt | , | ||||
| Bill Jones | jones-004bil | 1900 | 5/9- | New London Whalers | Connecticut State League | New London, CT | |
| Bud Jones | jones-131--- | 1900 | +7/30+ | Flandreau | Independent | Flandreau, SD | |
| Bumpus Jones | jones-011cha | 1900 | 4/20-5/1 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Bumpus Jones | jones-011cha | 1900 | 5/20-8/9 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Bumpus Jones | jones-011cha | 1900 | 8/16-9/15 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Charlie Jones | jones-005cha | 1900 | Grove City Col. | College | , | ||
| Charlie Jones | jones-005cha | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Charlie Jones | jones-005cha | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Charlie Jones | jones-005cha | 1900 | 8/12-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Cowboy Jones | jones-003alb | 1900 | 4/21-10/13 | 39 g. | St. Louis | National League | St. Louis, MO |
| Davy Jones | jones-005dav | 1900-01 | No. Illinois U. | College | , | ||
| Evarts Jones | jones-002eva | 1900 | KC-BankCommerce | Independent | Kansas City, MO | ||
| Fielder Jones | jones-001fie | 1900 | 4/24-10/12 | 136 g. | Brooklyn | National League | Brooklyn, NY |
| Jim Jones | jones-022jam | 1900 | 5/11-8/25 | Rome Romans | New York State League | Rome, NY | |
| Jim Jones | jones-022jam | 1900 | 8/28-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Oscar Jones | jones-002osc | 1900 | 2 g. | Oakland Oaks | California League | Oakland, CA | |
| Oscar Jones | jones-002osc | 1900 | 15 g. | Hanford | San Joaquin | Hanford, CA | |
| Oscar Jones | jones-002osc | 1900 | -9/19 | 15/17 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Willis Jones | jones-041wil | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | ||
| Harry Jope | jope--001hen | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| Harry Jope | jope--001hen | 1900 | Bangor | Independent | Bangor, ME | ||
| Charlie Jordan | jordan003cha | 1900 | 5/15-5/30 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Charlie Jordan | jordan003cha | 1900 | 6/16-7/7 | New Castle Quakers | Interstate League | New Castle, PA | |
| H.O. Jordan | jordan032--- | 1900 | 7/2-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Hugo Jordan | 1900 | Selma | Independent | Selma, AL | |||
| Robert Jordan | 1900 | Cuban X Giants | Black Baseball League | Cuban, | |||
| Slats Jordan | jordan001cla | 1900 | 5/9-5/12 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Theodore Jordan | jordan000the | 1900 | Kingston | Kingston, | |||
| Addie Joss | joss--001adr | 1900 | 4/28-9/12 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| William Joyner | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | |||
| Jupiter | jupite001--- | 1900 | +4/15+ | Cuban X Giants | Black Baseball League | Cuban, | |
| Mike Kahoe | kahoe-001mic | 1900 | 4/19-10/13 | 52 g. | Cincinnati | National League | Cincinnati, OH |
| Charles Kain | kain--001cha | 1900 | 4/30-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Charles Kain | kain--001cha | 1900 | 6/18-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| George Kalkhoff | kalkho002geo | 1900 | no g. | Schenectady Electricians | New York State League | Schenectady, NY | |
| Kane | kane--006--- | 1900 | 2 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Kane | kane--024--- | 1900 | 9 g. | Oakland Oaks | California League | Oakland, CA | |
| Billy Kane | kane--002wil | 1900 | 4/28-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Harry Kane | kane--001har | 1900 | 12 g. | Denver Grizzlies | Western League | Denver, CO | |
| Steve Kane | kane--001ste | 1900 | 35 g. | Danville Champions | Central League | Danville, IL | |
| Jack Katoll | katoll001joh | 1900 | 4/21-9/8 | Chicago White Stockings | American League | Chicago, IL | |
| Kaufman | 1900 | Reading Browns | Independent | Reading, PA | |||
| Johnnie Kaufman | kaufma002joh | 1900 | 7/7 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Phil Kavanaugh | kavana001phi | 1900 | no g. | St. Paul | American Association | St. Paul, MN | |
| Kid Keane | keane-001kid | 1900 | 7/24-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| Kearney | kearne001--- | 1900 | 8/30-8/31 | Albany Senators | New York State League | Albany, NY | |
| Al Kearns | kearns001al- | 1900 | 7/18 | Omaha Omahogs | Western League | Omaha, NE | |
| George Keefe | keefe-002geo | 1900 | 4/30-5/16 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| George Keefe | keefe-002geo | 1900 | 50 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Harry Keefer | keefer001har | 1900 | 5/5-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Keeler | keeler001--- | 1900 | 3 g. | Azusa | Southern California League | Azusa, CA | |
| Willie Keeler | keeler001wil | 1900 | 4/19-10/13 | 136 g. | Brooklyn | National League | Brooklyn, NY |
| Keely | keely-002--- | 1900 | Raleigh Senators | North Carolina Association | Raleigh, NC | ||
| Jack Keenan | keenan001kid | 1900 | 5/2-5/12 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Jack Keenan | keenan001kid | 1900 | 7/22-7/31 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Joe Keenan | keenan001jos | 1900 | 4/28-6/28 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Joe Keenan | keenan001jos | 1900 | 7/9-7/28 | New Castle Quakers | Interstate League | New Castle, PA | |
| Joe Keenan | keenan001jos | 1900 | 8/4-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Harry Keener | keener001har | 1900 | 4/30- | Jersey City City | Atlantic League | Jersey City, NJ | |
| Harry Keener | keener001har | 1900 | -6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Keiler | keiler001--- | 1900 | 8/18 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Bill Keister | keiste001wil | 1900 | 4/19-10/9 | 126 g. | St. Louis | National League | St. Louis, MO |
| Jack Keller | keller001jac | 1900 | 7 g. | San Diego | Southern California League | San Diego, CA | |
| Kelley | kelley021--- | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| Kelley | 1900 | Genuine Cuban Giants | Independent | Genuine, | |||
| George Kelley | kelley003geo | 1900 | 1 g. | Visalia | San Joaquin | Visalia, CA | |
| Joe Kelley | kelley002jos | 1900 | 4/19-10/6 | 121 g. | Brooklyn | National League | Brooklyn, NY |
| Joseph Kelley | kelley003jos | 1900 | 4/26-5/2 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Joseph Kelley | kelley003jos | 1900 | 5/9-6/22+ | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Mike Kelley | kelley002mic | 1900 | 4/20-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| William Kelley | kelley014wil | 1900 | Cuban Giants | Black Baseball | , | ||
| Albert Kellner | kellne001alb | 1900 | +5/6-6/6+ | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Albert Kellner | kellne001alb | 1900 | 8/5-9/16 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Marion, IN | |
| Win Kellum | kellum001win | 1900 | 4/20-9/17 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Kelly | kelly-068--- | 1900 | 6/6 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Kelly | kelly-079--- | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Kelly | kelly-029--- | 1900 | +5/24- | Utica Reds | New York State League | Utica, NY | |
| B. Kelly | kelly-100--- | 1900 | Richmond Blue Birds | Virginia League | Richmond, VA | ||
| Billy Kelly | kelly-004wil | 1900 | 5/5-9/4 | Pueblo Indians | Western League | Pueblo, CO | |
| Billy Kelly | kelly-004wil | 1900 | 24 g. | Oakland Oaks | California League | Oakland, CA | |
| Billy Kelly | kelly-004wil | 1900 | -12/2 | 24 g. | Oakland Oaks | California League | Oakland, CA |
| George Kelly | kelly-005geo | 1900 | 4/30-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| George Kelly | kelly-005geo | 1900 | 6/13-14 | Umpire | Virginia League | , | |
| George Kelly | kelly-005geo | 1900 | 6/15-6/21 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| George Kelly | kelly-005geo | 1900 | Hampton Crabs | Virginia League | Hampton, VA | ||
| George Kelly | kelly-005geo | 1900 | 6/22-7/2 | Va | , VA | ||
| George Kelly | kelly-005geo | 1900 | 7/4-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Michael Kelly | kelly-003mic | 1900 | 5/7-5/12 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Kelton | kelton001--- | 1900 | 7/20 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Bill Kemmer | kemmer001wil | 1900 | 4/30-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Ed Kenna | kenna-004edw | 1900 | Homer School | School | , | ||
| Ed Kenna | kenna-004edw | 1900 | 6/25-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| Ed Kenna | kenna-004edw | 1900 | 9/1-9/15 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Kennedy | kenned052--- | 1900 | 5/4-5/31 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Albert Kennedy | kenned002alb | 1900 | 5/11-6/17 | Troy Washerwomen | New York State League | Troy, NY | |
| Brickyard Kennedy | kenned005wil | 1900 | 4/19-10/3 | 43 g. | Brooklyn | National League | Brooklyn, NY |
| Charles Kennedy | kenned001cha | 1900 | 5/9-9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Doc Kennedy | kenned001doc | 1900 | Hammondsp.NY | Independent | Hammondsport, NY | ||
| F. Kennedy | 1900 | no g. | Meriden Silverites | Connecticut State League | Meriden, CT | ||
| Jack Kennedy | kenned001joh | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Jack Kennedy | kenned001joh | 1900 | -9/5 | 17 g. | Albany Senators | New York State League | Albany, NY |
| Sam Kennedy | kenned001sam | 1900 | 6/5-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Sherman Kennedy | kenned001she | 1900 | 5/10-6/5 | New London Whalers | Connecticut State League | New London, CT | |
| Sherman Kennedy | kenned001she | 1900 | -10/14 | Canton | Independent | Canton, OH | |
| Richard Kenney | 1900 | no g. | Pueblo Indians | Western League | Pueblo, CO | ||
| John Kerin | kerin-001joh | 1900 | 5/10-6/23 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| John Kerin | kerin-001joh | 1900 | 6/29-7/19 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Al Kern | kern--001alv | 1900 | 4/28-5/23 | Buffalo Bisons | American League | Buffalo, NY | |
| Al Kern | kern--001alv | 1900 | 6/9-6/14 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Peter Kernan | 1900 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |||
| Dan Kerwin | kerwin001dan | 1900 | 5/1-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Dan Kerwin | kerwin001dan | 1900 | 6/14-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| Fred Ketchum | ketchu001fre | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Fred Ketchum | ketchu001fre | 1900 | 7/1-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Louis Ketchum | ketchu001lou | 1900 | Haskell Inst. | School | , | ||
| Peter Kiernan | kierna001pet | 1900 | 5/10-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Tom Kiernan | kierna001tho | 1900 | 96 g. | Peoria Distillers | Central League | Peoria, IL | |
| Tom Kiernan | kierna001tho | 1900 | Decatur Commodores | Central League | Decatur, IL | ||
| George Kihm | kihm--001geo | 1900 | 5/11-9/8 | Troy Washerwomen | New York State League | Troy, NY | |
| Frank Killen | killen002fra | 1900 | 5/8-6/27 | 6 g. | Chicago | National League | Chicago, IL |
| Frank Killen | killen002fra | 1900 | 7/13 | Chicago White Stockings | American League | Chicago, IL | |
| Frank Killen | killen002fra | 1900 | 8/9-9/3 | Toronto Canucks | Eastern League | Toronto, ON | |
| Edward Killilay | killil001ed- | 1900 | 20th KS, Co. C | Army | , | ||
| John Kimble | kimbal002joh | 1900 | 5/11- | Binghamton Crickets | New York State League | Binghamton, NY | |
| Clem Kimerer | kimere001cle | 1900 | +6/3-7/29+ | SLC-Short LineRR | Independent | , | |
| King | king--007--- | 1900 | 5/15-6/9 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| King | king--006--- | 1900 | 5/10-5/16 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Frank King | king--002fra | 1900 | 6/1-6/13+ | Derby Angels | Connecticut State League | Derby, CT | |
| Frank King | king--002fra | 1900 | Wabash | Indiana State League | Wabash, IN | ||
| Frank King | king--002fra | 1900 | 58 g. | Peoria Distillers | Central League | Peoria, IL | |
| Frank King | king--002fra | 1900 | Danville Champions | Central League | Danville, IL | ||
| Frank King | king--002fra | 1900 | Decatur Commodores | Central League | Decatur, IL | ||
| Husky King | king--002h-- | 1900 | +5/31-9/18+ | Albuquerque | Independent | Albuquerque, NM | |
| Philip King | 1900 | Univ. Wisconsin | College | , | |||
| Billy Kinloch | kinloc001bil | 1900 | 92 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Benjamin Kinney | kinney001ben | 1900 | 6/25-7/25 | New London Whalers | Connecticut State League | New London, CT | |
| Larry Kinsella | kinsel001law | 1900 | 5/22- | 9 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Frank Kitson | kitson001fra | 1900 | 4/20-10/4 | 43 g. | Brooklyn | National League | Brooklyn, NY |
| Malachi Kittridge | kittri001mal | 1900 | 4/26-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Hugh Klauber | klaube001hug | 1900 | 3 g. | San Diego | Southern California League | San Diego, CA | |
| Red Kleinow | kleino001joh | 1900 | 5/1-5/3 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Red Kleinow | kleino001joh | 1900 | 5/11-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Red Kleinow | kleino001joh | 1900 | 7/18-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Kling | kling-001--- | 1900 | Albany Senators | New York State League | Albany, NY | ||
| John Kling | kling-002joh | 1900 | 24 g. | Decatur Commodores | Central League | Decatur, IL | |
| Johnny Kling | kling-001joh | 1900 | 5/5-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Johnny Kling | kling-001joh | 1900 | 9/11-9/30 | 15 g. | Chicago | National League | Chicago, IL |
| Charles Klobedanz | klobed001cha | 1900 | 5/15-6/11 | Derby Angels | Connecticut State League | Derby, CT | |
| Fred Klobedanz | klobed001fre | 1900 | 4/27-9/19 | Worcester Farmers | Eastern League | Worcester, MA | |
| Klock | klock-001--- | 1900 | 5/16-7/4 | Chatham Reds | International League | Chatham, ON | |
| Gus Klopf | klopf-001gus | 1900 | 4/28 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Gus Klopf | klopf-001gus | 1900 | 4/30-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| Gus Klopf | klopf-001gus | 1900 | 67 g. | Utica Reds | New York State League | Utica, NY | |
| Gus Klopf | klopf-001gus | 1900 | -9/8 | Troy Washerwomen | New York State League | Troy, NY | |
| Louis Knau | knau--001lou | 1900 | 7/15-7/22 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Phil Knell | knell-001phi | 1900 | 2 g. | Visalia | San Joaquin | Visalia, CA | |
| Phil Knell | knell-001phi | 1900 | -12/2 | 20 g. | San Francisco Brewers | California League | San Francisco, CA |
| H. Knipper | 1900 | 6/4-6/15 | Hampton Crabs | Virginia League | Hampton, VA | ||
| Julius Knoll | knoll-001jul | 1900 | 4/19-5/10 | Buffalo Bisons | American League | Buffalo, NY | |
| Julius Knoll | knoll-001jul | 1900 | 5/15-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Julius Knoll | knoll-001jul | 1900 | 6/18-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Punch Knoll | knoll-001cha | 1900 | Evansv.- | EvanCourier | Evansville, IN | ||
| Dick Knox | knox--002ric | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Dick Knox | knox--002ric | 1900 | -9/23 | 48 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Kochert | 1900 | Reading Browns | Independent | Reading, PA | |||
| Koetz | koetz-001--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Will Kohnle | kohnle001wil | 1900 | 4/30-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| William Kommer | kommer000bil | 1900 | no g. | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Fred Kossuch | kossuc001fre | 1900 | Canton | Independent | Canton, OH | ||
| Joe Kostal | kostal001jos | 1900 | 5/12-7/2 | London Tecumsehs | International League | London, ON | |
| Joe Kostal | kostal001jos | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Olaf Kranz | kranz-001--- | 1900 | Cambridge | Independent | Cambridge, IL | ||
| Charlie Krause | krause001cha | 1900 | 9/1-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Bill Krieg | krieg-001bil | 1900 | 75 g. | Peoria Distillers | Central League | Peoria, IL | |
| Bill Krieg | krieg-001bil | 1900 | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| William Krouse | 1900 | , | |||||
| Otto Krueger | kruege002art | 1900 | 4/28-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Otto Krueger | kruege002art | 1900 | 10/1-10/14 | 12 g. | St. Louis | National League | St. Louis, MO |
| Henry Krug | krug--001hen | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Jimmy Kuhn | kuhn--001jam | 1900 | 4/30-6/4 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Jimmy Kuhn | kuhn--001jam | 1900 | Chester | Independent | Chester, PA | ||
| Charlie Kuhns | kuhns-001cha | 1900 | 4/26-5/12 | Worcester Farmers | Eastern League | Worcester, MA | |
| Charlie Kuhns | kuhns-001cha | 1900 | 5/14-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Kuhry | kuhry-001--- | 1900 | 7 g. | Azusa | Southern California League | Azusa, CA | |
| Harry Kuran | kuran-001har | 1900 | Pocotello ID | Independent | Pocatello, ID | ||
| La Rue | larue-002--- | 1900 | Taftville | Amateur | Taftville, | ||
| La Rue | larue-002--- | 1900 | 7/28 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Hank Labelle | labell001hen | 1900 | 8/19 | Troy Washerwomen | New York State League | Troy, NY | |
| George LaChance | lachan001geo | 1900 | 4/21-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Hi Ladd | ladd--001art | 1900 | 4/30-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| Hi Ladd | ladd--001art | 1900 | 6/1-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Ladsinger | 1900 | 1 g. | Fresno | San Joaquin | Fresno, CA | ||
| John Lagger | lagger001joh | 1900 | +7/4+ | Marquette WI | Independent | Marquette, WI | |
| Thomas Lagratt | lagrat000tho | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Paul LaGrave | lagrav001pau | 1900 | Christian Bros. | High School | , | ||
| Nap Lajoie | lajoie001nap | 1900 | 4/19-10/2 | 102 g. | Philadelphia | National League | Philadelphia, PA |
| Bud Lally | lally-003bud | 1900 | +5/30+ | Rich.-Entre Nous | Independent | Richmond, VA | |
| Dan Lally | lally-001dan | 1900 | 4/21-4/30 | Chicago White Stockings | American League | Chicago, IL | |
| Dan Lally | lally-001dan | 1900 | 5/3-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| H.J. Lally | lally-001--- | 1900 | 7/27-9/1 | Pueblo Indians | Western League | Pueblo, CO | |
| C.W. Lambert | lamber000cw- | 1900 | 6/25-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| Pete Lamer | lamer-001pie | 1900 | 5/4 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Pete Lamer | lamer-001pie | 1900 | 5/7-6/18 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Pete Lamer | lamer-001pie | 1900 | 6/25-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| Ernest Landgraf | landgr001ern | 1900 | Asbury Park | Independent | Asbury Park, NJ | ||
| S.W. Landrum | landru001s-- | 1900 | 5/2-7/10+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| William Landvoigt | 1900 | , | |||||
| Ed Lane | lane--001ed- | 1900 | Auburn University | College | , | ||
| Lang | lang--014--- | 1900 | Monarchs | , | |||
| Lang | 1900 | 4 g. | Visalia | San Joaquin | Visalia, CA | ||
| Fred Lange | lange-001fre | 1900 | 52 g. | Oakland Oaks | California League | Oakland, CA | |
| Bob Langsford | langsf001bob | 1900 | +5/10+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Lanigan | laniga001--- | 1900 | 8/11-8/20 | New Castle Quakers | Interstate League | New Castle, PA | |
| Lantry | lantry002--- | 1900 | 3 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| L.A. Lantz | lantz-001l-- | 1900 | 6/16-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Frank LaPorte | laport002fra | 1900 | Hiram College | College | , | ||
| Teddy Larkin | larkin001pie | 1900 | Hinsdale | Independent | Hinsdale, NH | ||
| Sam LaRocque | larocq001sam | 1900 | 11 g. | St. Hyacinthe | Provincial League | St. Hyacinthe, | |
| Arlie Latham | latham002wal | 1900 | 7 g. | MLB Umpire | National League | , | |
| Dick Latham | latham001ric | 1900 | , | ||||
| Frank Lathrop | lathro001fra | 1900 | 5/14- | Troy Washerwomen | New York State League | Troy, NY | |
| Gregg Latimer | latime001m-- | 1900 | 5/17 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Gregg Latimer | latime001m-- | 1900 | Chester | Independent | Chester, PA | ||
| Gregg Latimer | latime001m-- | 1900 | +6/29-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Gregg Latimer | latime001m-- | 1900 | 8/20 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Tacks Latimer | latime001cli | 1900 | 4/27-5/20 | 4 g. | Pittsburgh | National League | Pittsburgh, PA |
| Tacks Latimer | latime001cli | 1900 | 5/28-7/8 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Tacks Latimer | latime001cli | 1900 | 7/12-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Billy Lauder | lauder001wil | 1900 | Attleboro | Independent | Attleboro, MA | ||
| George Lauder | lauder001geo | 1900 | Greenwich CT | Independent | Greenwich, CT | ||
| Ed Lauzon | lauzon001edw | 1900 | 101 g. | Omaha Omahogs | Western League | Omaha, NE | |
| Jack Law | law---001joh | 1900 | 4/28-8/8 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Ed Lawler | lawler001ed- | 1900 | 6/14 | Omaha Omahogs | Western League | Omaha, NE | |
| Ed Lawler | lawler001ed- | 1900 | 8/28-9/4 | Omaha Omahogs | Western League | Omaha, NE | |
| Jack Lawler | lawler003joh | 1900 | 5/10-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Jack Lawlor | lawlor001joh | 1900 | +5/20-9/8 | Troy Washerwomen | New York State League | Troy, NY | |
| Chris Lawrence | lawren000chr | 1900 | Danville Champions | Central League | Danville, IL | ||
| Fred Lawrence | 1900 | Norwich Witches | Connecticut State League | Norwich, CT | |||
| Mike Lawrence | lawren001mic | 1900 | 4/30-5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Mike Lawrence | lawren001mic | 1900 | 6/22-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Lawson | lawson012--- | 1900 | 6/8- | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Lawson | lawson012--- | 1900 | -6/11 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Al Lawson | lawson001al- | 1900 | -6/21 | Peoria Distillers | Central League | Peoria, IL | |
| Jack Lawson | lawson004jac | 1900 | New Britain CT | Independent | New Britain, CT | ||
| Frank Layne | layne-001fra | 1900 | Arkansas City | Independent | Arkansas City, KS | ||
| Tommy Leach | leach-001tho | 1900 | 4/26-10/6 | 51 g. | Pittsburgh | National League | Pittsburgh, PA |
| Dan Leahy | leahy-002dan | 1900 | New Orleans LA | Independent | New Orleans, LA | ||
| Dan Leahy | leahy-002dan | 1900 | 5/11- | 108 g. | Albany Senators | New York State League | Albany, NY |
| David Leahy | leahy-002dav | 1900 | 5/2 | Scranton Miners | Atlantic League | Scranton, PA | |
| Tom Leahy | leahy-002tho | 1900 | 4/26-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Tom Leahy | leahy-001tom | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Frank Leary | leary-001fra | 1900-06 | U. of Pennsylvania | College | , | ||
| Lee | lee---007--- | 1900 | +5/9+ | Anderson | Indiana State League | Anderson, IN | |
| Lee | lee---007--- | 1900 | 7/2-7/28 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| George Lee | lee---001geo | 1900 | 5/14-6/11 | Utica Reds | New York State League | Utica, NY | |
| Jack Lee | lee---003joh | 1900 | 5/14-7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Jack Lee | lee---003joh | 1900 | 7/30-9/7 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Wyatt Lee | lee---001wya | 1900 | 4/20-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Sam Leever | leever001sam | 1900 | 4/19-10/9 | 30 g. | Pittsburgh | National League | Pittsburgh, PA |
| Bill LeGrande | legran001w-- | 1900 | +5/10+ | Trinity Col(Duke) | College | , | |
| Bill LeGrande | legran001w-- | 1900 | 6/25-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Bill LeGrande | legran001w-- | 1900 | Concord | Independent | Concord, NC | ||
| George Leidy | leidy-002geo | 1900 | +5/20-9/8 | Troy Washerwomen | New York State League | Troy, NY | |
| Leipsie | leipsi001--- | 1900 | 7/17-7/18 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Harry Leisz | 1900 | 12 g. | Hanford | San Joaquin | Hanford, CA | ||
| Bill Leith | leith-001bil | 1900 | 6/21 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Harry Leland | leland001har | 1900 | 5 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Frank Leonard | leonar001fra | 1900 | ?-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| John Leonard | leonar001--- | 1900 | 5/1-5/10 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| John Leonard | leonar001--- | 1900 | 5/16-6/1 | Hampton Crabs | Virginia League | Hampton, VA | |
| Pete LePine | lepine002lou | 1900 | 5/10-7/14 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Lepper | lepper001--- | 1900 | 2 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Tom Letcher | letche001tom | 1900 | 4/28-8/10 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Charles Leverenz | levere001chr | 1900 | Danville Champions | Central League | Danville, IL | ||
| Rube Levy | levy--001reu | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Ed Lewee | lewee-001edw | 1900 | 85 g. | Denver Grizzlies | Western League | Denver, CO | |
| Lewis | lewis-003--- | 1900 | +8/26+ | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Ted Lewis | lewis-001edw | 1900 | 5/4-8/18 | 30 g. | Boston | National League | Boston, MA |
| Ted Lewis | lewis-001edw | 1900 | 8/22-8/31 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Ted Lewis | lewis-001edw | 1900 | 9/3-10/13 | 30 g. | Boston | National League | Boston, MA |
| Charles Leyh | leyh--001cha | 1900 | 5/23-7/6 | Derby Angels | Connecticut State League | Derby, CT | |
| Lillis | 1900 | +7/4+ | Pocatello ID | Independent | Pocatello, ID | ||
| Lindsay | lindsa004--- | 1900 | +5/15-6/8 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| John Lindsay | lindsa002joh | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| J.W. Lindsley | lindsl001j-- | 1900 | 5/12-6/16 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Joe Linker | 1900 | Denver Grizzlies | Western League | Denver, CO | |||
| Perry Lipe | lipe--001per | 1900 | 55 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Perry Lipe | lipe--001per | 1900 | 6/25-9/10 | Springfield/Jacksonville | Central League | Jacksonville, IL | |
| Jimmy Little | little001jim | 1900 | 1 g. | San Diego | Southern California League | San Diego, CA | |
| Jimmy Little | little001jim | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Jimmy Little | little001jim | 1900 | 2 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Jimmy Little | little001jim | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Eddie Livingstone | living001edd | 1900 | 25 g. | Springfield/Jacksonville | Central League | Jacksonville, IL | |
| Jake Livingstone | living001jac | 1900 | 7/8 | Hoboken | Independent | Hoboken, NJ | |
| Jake Livingstone | living001jac | 1900 | 7/10-7/23 | Derby Angels | Connecticut State League | Derby, CT | |
| Jake Livingstone | living001jac | 1900 | 8/3 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Abel Lizotte | lizott001abe | 1900 | 4/26-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| Harry Lloyd | lloyd-002har | 1900 | 6/2-6/5 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Thomas Lloyd | lloyd-001tho | 1900 | 5/22- | 21 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Thomas Lloyd | lloyd-001tho | 1900 | 3 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Hans Lobert | lobert001joh | 1900-03 | Carnegie Tech | College | , | ||
| Harry Lochhead | lochhe001rob | 1900 | 4/1- | 38 g. | Stockton Wasps | California League | Stockton, CA |
| Harry Lochhead | lochhe001rob | 1900 | -9/23 | 10 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Frank Locke | locke-001fra | 1900 | Canton | Independent | Canton, OH | ||
| Frank Locke | locke-001fra | 1900 | 8/3-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Frank Locke | locke-001fra | 1900 | 8/24-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Charles Loercher | loerch001cha | 1900 | Lancaster Actives | Independent | Lancaster, PA | ||
| Tom Loftus | loftus002tom | 1900 | 146 g. | Chicago | National League | Chicago, IL | |
| Joe Lohbeck | lohbec001jos | 1900 | 5/10-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Pete Lohman | lohman001geo | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Pete Lohman | lohman001geo | 1900 | 7/12-8/3 | London Tecumsehs | International League | London, ON | |
| Pete Lohman | lohman001geo | 1900 | 8/14 | Omaha Omahogs | Western League | Omaha, NE | |
| Pete Lohman | lohman001geo | 1900 | -12/2 | 20 g. | Oakland Oaks | California League | Oakland, CA |
| Frank Lohr | lohr--001fra | 1900 | 15 g. | Peoria Distillers | Central League | Peoria, IL | |
| Roy Loman | loman-001roy | 1900 | Worcester NY | Independent | Worcester, NY | ||
| Roy Loman | loman-001roy | 1900 | Atchison | Independent | Atchison, KS | ||
| Roy Loman | loman-001roy | 1900 | 6/12-9/4 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Herman Long | long--001her | 1900 | 4/19-10/13 | 125 g. | Boston | National League | Boston, MA |
| Red Long | long--001nel | 1900 | 5/16-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Red Long | long--001nel | 1900 | 7/19-7/30 | London Tecumsehs | International League | London, ON | |
| Harry Longley | longle001har | 1900 | 4/30-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Harry Longley | longle001har | 1900 | 37 g. | Decatur Commodores | Central League | Decatur, IL | |
| Julio Lopez | lopez-007jul | 1900 | Almendarista | Cuban League | , | ||
| Manuel Lopez | lopez-009man | 1900 | Almendarista | Cuban League | , | ||
| Bert Lougheed | loughe001ber | 1900 | Stanford Univ. | College | , | ||
| Love | love--002--- | 1900 | 2 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Lovell | lovell001--- | 1900 | 5/10-5/11+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| L. Lovio | lovio-000l-- | 1900 | Cubano | Cuban League | , | ||
| Bobby Lowe | lowe--002rob | 1900 | 4/19-10/13 | 127 g. | Boston | National League | Boston, MA |
| Frank Lowe | lowe--001fra | 1900 | 3 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Lowery | lowery001--- | 1900 | 7/29-8/3 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Dennis Lowney | lowney001dan | 1900 | 4/28-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Lowney? | lowney001--- | 1900 | 7/15 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Loy | loy---001--- | 1900 | 34 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| William Lucas | lucas-005wil | 1900 | Pres.-Sec. | Montana State League | , | ||
| Fred Luchia | lucia-001fre | 1900 | 5/10-9/8 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Baldo Luitich | luitic001bal | 1900 | 4/30-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Harry Lumley | lumley001har | 1900 | Lestershire MA | Independent | Lestershire, MA | ||
| Lump | lump--001--- | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| Billy Lush | lush--001wil | 1900 | 4/26-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Charlie Luskey | luskey001cha | 1900 | 4/30-6/11 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Fred Luther | luther001fre | 1900 | +8/14+ | Muskegon Reds | Independent | Muskegon, MI | |
| Bobby Lynch | lynch-006rob | 1900-02 | Notre Dame | College | , | ||
| Ed Lynch | lynch-002edw | 1900 | 5/16-7/7 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Ed Lynch | lynch-002edw | 1900 | 7/10-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Ed Lynch | lynch-002edw | 1900 | 8/5-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Henry Lynch | lynch-003hen | 1900 | 4/26-6/5 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Henry Lynch | lynch-003hen | 1900 | 6/6-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Mike Lynch | lynch-003mic | 1900 | 5/22- | 61 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Mike Lynch | lynch-003mic | 1900 | -9/23 | 3 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Mike Lynch | lynch-004mic | 1900 | 5/10-6/6 | New London Whalers | Connecticut State League | New London, CT | |
| Joseph Lyndon | 1900 | 7/27-7/30 | Umpire | Eastern League | , | ||
| J. Lyon | lyon--001j-- | 1900 | 4 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Lyons | lyons-031--- | 1900 | 4 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Lyons | lyons-028--- | 1900 | +5/6-6/7+ | Kokomo | Indiana State League | Kokomo, IN | |
| Lyons | lyons-011--- | 1900 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | ||
| Denny Lyons | lyons-002den | 1900 | 4/28-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Harry Lyons | lyons-001har | 1900 | Phil.-Crescents | Independent | Philadelphia, PA | ||
| Walter Lyons | lyon--003--- | 1900 | 44 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Dad Lytle | lytle-001dad | 1900 | 5/2-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Joseph Lytra | lytra-001--- | 1900 | 5/1 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Malcolm MacDonald | mcdona001jam | 1900 | +8/9-+9/21 | Phil.-Roxborough | Independent | Philadelphia, PA | |
| Mack | 1900 | Norwich Witches | Connecticut State League | Norwich, CT | |||
| Connie Mack | mack--001con | 1900 | 4/19-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Eugene Mack | mack--001eug | 1900 | 5/9-5/10 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Eugene Mack | mack--001eug | 1900 | 5/15-5/22 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Edward Mackey | mackey001a-- | 1900 | 5/6-6/25 | Omaha Omahogs | Western League | Omaha, NE | |
| Robert MacLatchie | mclatc001rob | 1900 | Reading Browns | Independent | Reading, PA | ||
| Art Madison | madiso002art | 1900 | 4/20-9/8 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Bill Magee | magee-001wil | 1900 | 4/26-9/19 | Worcester Farmers | Eastern League | Worcester, MA | |
| Jack Magee | magee-001t-- | 1900 | 6/15-9/6 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| William Magee | magee-002wil | 1900 | 5/28 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| William Magee | magee-002wil | 1900 | 7/2-7/5 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Jake Magie | magie-001jac | 1900 | 4/30-5/31 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Maginnis | maginn002--- | 1900 | 5/7-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| George Magoon | magoon001geo | 1900 | 4/23-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Jose Magrinat | magrin000jos | 1900 | Cubano | Cuban League | , | ||
| Tom Maguire | maguir001tho | 1900 | Azusa | Southern California League | Azusa, CA | ||
| Jack Mahaffey | mahaff001joh | 1900 | 5/2 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Jack Mahaffey | mahaff001joh | 1900 | 4/30-8/19 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Jack Mahaffey | mahaff001joh | 1900 | 8/24-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Lou Mahaffey | mahaff002lou | 1900 | , | ||||
| William Mahaffey | mahaff003--- | 1900 | 4/30-5/21 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Mahan | mahan-003--- | 1900 | 5/14-5/18 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Maher | maher-003--- | 1900 | 6/11-6/23 | New London Whalers | Connecticut State League | New London, CT | |
| Tom Maher | maher-001tho | 1900 | Wilmington | Independent | Wilmington, DE | ||
| Henry Mahler | mahler001--- | 1900 | Lancaster Actives | Independent | Lancaster, PA | ||
| Ernest Mains | mains-001ern | 1900 | -7/10 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Willard Mains | mains-001wil | 1900 | 5/11- | 46 g. | Rome Romans | New York State League | Rome, NY |
| John Malarkey | malark001joh | 1900 | 5/16- | 11 g. | Rome Romans | New York State League | Rome, NY |
| John Malarkey | malark001joh | 1900 | Utica Reds | New York State League | Utica, NY | ||
| Malcomb | malcol005--- | 1900 | +6/21+ | Piedmont-GreenvSC | Independent | Piedmont, SC | |
| Malcomb | malcol005--- | 1900 | 7/20-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Malcomb | malcol005--- | 1900 | Charleston SC | Independent | Charleston, SC | ||
| Billie Malone | malone002bil | 1900 | U. So. Carolina | College | , | ||
| Billie Malone | malone002bil | 1900 | 6/25-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| Billy Maloney | malone003wil | 1900 | Norwich Witches | Connecticut State League | Norwich, CT | ||
| George Maloney | malone002geo | 1900 | Pueblo Indians | Western League | Pueblo, CO | ||
| Anthony Mangerina | manger001ant | 1900 | 51 g. | Oakland Oaks | California League | Oakland, CA | |
| Henry Mangerina | manger001hen | 1900 | 7 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Dolph Mangum | mangum000dol | 1900 | Wm. Bingham Mili | School | , | ||
| Dolph Mangum | mangum000dol | 1900 | 6/25-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Dolph Mangum | mangum000dol | 1900 | Wm. Bingham Mili | School | , | ||
| Dolph Mangum | mangum000dol | 1900 | 6/25-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| Zeb Mangum | mangum000zeb | 1900 | 6/25-8.4 | Statesville | North Carolina Association | Statesville, NC | |
| Zeb Mangum | mangum000zeb | 1900 | Newport TN | Independent | Newport, TN | ||
| Zeb Mangum | mangum000zeb | 1900 | 6/25-8.4 | Statesville | North Carolina Association | Statesville, NC | |
| Zeb Mangum | mangum000zeb | 1900 | Newport TN | Independent | Newport, TN | ||
| Daniel Manley | manley001dan | 1900 | 5/9-5/12 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Al Mannassau | mannas001al- | 1900 | 7/22-9/3 | Umpire | Amateur | , | |
| Harry Manner | manner001har | 1900 | 5/1-5/3 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Harry Manner | manner001har | 1900 | 5/7-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Harry Manner | manner001har | 1900 | 6/25-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Manning | mannin017--- | 1900 | 9/3 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Jim Manning | mannin001jim | 1900 | 4/19-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Tommy Manning | mannin001tho | 1900 | 5/10-7/27+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Claude Marcum | marcum001cla | 1900 | 6/18-7/2 | Pueblo Indians | Western League | Pueblo, CO | |
| Bert Margetts | marget001nel | 1900 | +7/29+ | SLC-Short LineRR | Independent | , | |
| George Markley | markle001geo | 1900 | Mexico TX | Independent | Mexico, TX | ||
| George Markley | markle001geo | 1900 | El Paso | Independent | El Paso, TX | ||
| James Maroney | marone001--- | 1900 | Meri.-Dublins | Independent | Meriden, CT | ||
| James Maroney | marone001--- | 1900 | 8/29 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| T. Maroney | marone001t-- | 1900 | Meri.-Dublins | Independent | Meriden, CT | ||
| William Maroney | marone001w-- | 1900 | 6/29-7/10 | Rome Romans | New York State League | Rome, NY | |
| Marris | 1900 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |||
| Marsh | marsh-002--- | 1900 | 5/25 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Archie Marshall | marsha001arc | 1900 | +7/21-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Joe Marshall | marsha001jos | 1900 | 5/22- | 42 g. | Helena Senators | Montana State League | Helena, MT |
| Joe Marshall | marsha001jos | 1900 | 17 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Clint Martin | martin002cli | 1900 | 5/11-7/1 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Frank Martin | martin001fra | 1900 | 6/2-6/4 | Buffalo Bisons | American League | Buffalo, NY | |
| Frank Martin | martin001fra | 1900 | 60 g. | Danville Champions | Central League | Danville, IL | |
| Frank Martin | martin001fra | 1900 | 9/11-9/12 | Cleveland Lake Shores | American League | Cleveland, OH | |
| James Martin | martin019jam | 1900 | 16 g. | Decatur Commodores | Central League | Decatur, IL | |
| William Martin | martin022wil | 1900 | 5/1-7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Manuel Martinez | martin008man | 1900 | San Francisco | Cuban League | , | ||
| Nel Mason | mason-001nel | 1900 | Ashtabula | Independent | Ashtabula, OH | ||
| Massey | massey009--- | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Bill Massey | massey001bil | 1900 | 4/26-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Christy Mathewson | mathew001chr | 1900 | Bucknell University | College | , | ||
| Christy Mathewson | mathew001chr | 1900 | 4/30-7/10 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Christy Mathewson | mathew001chr | 1900 | 7/17-9/26 | 6 g. | New York | National League | New York, NY |
| Jimmy Mathison | mathis002jam | 1900 | 5/9-6/9 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Al Mauch | mauch-001alb | 1900 | Cape May | Independent | Cape May, NJ | ||
| Hal Mauck | mauck-001hal | 1900 | +6/2-7/20 | Umpire | Western League | , | |
| Hal Mauck | mauck-001hal | 1900 | 7/28-8/19 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Hal Mauck | mauck-001hal | 1900 | 8/20-9/4 | Umpire | Western League | , | |
| Al Maul | maul--001alb | 1900 | 5/1-6/7 | 5 g. | Philadelphia | National League | Philadelphia, PA |
| Al Maul | maul--001alb | 1900 | 13 g. | Fresno | San Joaquin | Fresno, CA | |
| Harry Maupin | maupin001har | 1900 | 5/5-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Harry Maupin | maupin001har | 1900 | -9/23 | 8 g. | Helena Senators | Montana State League | Helena, MT |
| Maxwell | maxwel002--- | 1900 | 15 g. | Danville Champions | Central League | Danville, IL | |
| Clifford Mayne | mayne-001--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| John McAden | mcaden000joh | 1900 | Durham Bulls | North Carolina Association | Durham, NC | ||
| Jimmy McAleer | mcalee001jam | 1900 | 5/28-9/17 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Sport McAllister | mcalli001lew | 1900 | 4/19-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Tom McAndrew | mcandr002tho | 1900 | 6/12-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Tom McAndrew | mcandr002tho | 1900 | 7/23-7/31 | Hamilton Hams | International League | Hamilton, ON | |
| Tom McAndrew | mcandr002tho | 1900 | 8/1-8/10 | Worcester Farmers | Eastern League | Worcester, MA | |
| David McAndrews | mcandr001dav | 1900 | 7/10 | Hamilton Hams | International League | Hamilton, ON | |
| David McAndrews | mcandr001dav | 1900 | 7/12-7/19 | Minneapolis Millers | American League | Minneapolis, MN | |
| Mike McAndrews | mcandr001mic | 1900 | 5/- | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Algie McBride | mcbrid001alg | 1900 | 4/19-10/5 | 112 g. | Cincinnati | National League | Cincinnati, OH |
| Jack McBride | mcbrid001jac | 1900 | 6/28-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Pete McBride | mcbrid001pet | 1900 | 4/28-7/28 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| McCabe | mccabe007--- | 1900 | 6/9 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Thomas McCabe | 1900 | Chester | Independent | Chester, PA | |||
| William McCabe | mccabe008wil | 1900 | Chester | Independent | Chester, PA | ||
| Joe McCaffrey | mccaff001joe | 1900 | 5/10-6/2 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Joe McCaffrey | mccaff001joe | 1900 | Raleigh Senators | North Carolina Association | Raleigh, NC | ||
| Jack McCallister | mccall001jac | 1900 | 4/28-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Jack McCallister | mccall001jac | 1900 | 8/24-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| McCann | mccann006--- | 1900 | +5/15-6/5+ | Kokomo | Indiana State League | Kokomo, IN | |
| Gene McCann | mccann001hen | 1900 | 4/19-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Mike McCann | mccann001mic | 1900 | 4/28-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Mike McCann | mccann001mic | 1900 | 8/24-9/6 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Jack McCarthy | mccart003joh | 1900 | 4/19-10/13 | 124 g. | Chicago | National League | Chicago, IL |
| Jack McCarthy | mccart004jac | 1900 | preseason | Pueblo Indians | Western League | Pueblo, CO | |
| Jack McCarthy | mccart004jac | 1900 | 83 g. | Stockton Wasps | California League | Stockton, CA | |
| Joe McCarthy | mccart004jos | 1900 | 16 g. | San Francisco Brewers | California League | San Francisco, CA | |
| Joe McCarthy | mccart004jos | 1900 | 5/22- | 48 g. | Helena Senators | Montana State League | Helena, MT |
| Joe McCarthy | mccart004jos | 1900 | Colusa | Northern California League | Colusa, CA | ||
| Joe McCarthy | mccart003jos | 1900-05 | Niagara Univ. | College | , | ||
| Joseph McCarthy | 1900-05 | Niagara Univ. | College | , | |||
| Pat McCauley | mccaul001pat | 1900 | 4/27-8/7 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Billy McCausland | mccaus001wil | 1900 | 5/8-7/7 | Denver Grizzlies | Western League | Denver, CO | |
| Billy McCausland | mccaus001wil | 1900 | Denv.-Neefs | Independent | Denver, CO | ||
| Robert McClatchie | 1900 | , | |||||
| Willie McClellan | 1900 | +4/15+ | Cuban X Giants | Black Baseball League | Cuban, | ||
| Charles McCloskey | mcclos002cha | 1900 | 6/4-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| John McCloskey | mcclos001joh | 1900 | 4/28-5/25 | Umpire | Interstate League | , | |
| John McCloskey | mcclos001joh | 1900 | 25 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Harry McCloud | mcclou002har | 1900 | 4/30-6/13 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| McConkey | mcconk001--- | 1900 | 8/20 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| McConkey | mcconk001--- | 1900 | 8/28 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| John McCord | mccord001joh | 1900 | +5/6-6/5+ | Marion Glass Blowers | Indiana State League | Marion, IN | |
| John McCord | mccord001joh | 1900 | 8/5-9/10 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Marion, IN | |
| McCormick | mccorm015--- | 1900 | 7/31 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Barry McCormick | mccorm002wil | 1900 | 4/24-10/13 | 110 g. | Chicago | National League | Chicago, IL |
| Harry McCormick | mccorm004har | 1900-03 | Bucknell College | College | , | ||
| Jim McCormick | mccorm002jim | 1900 | +5/16- | 53 g. | Cortland Wagonmakers | New York State League | Cortland, NY |
| Charles McCoy | 1900 | Umpire | New England League | , | |||
| Judge McCredie | mccred001wal | 1900 | 55 g. | New Castle Quakers | Interstate League | New Castle, PA | |
| Judge McCredie | mccred001wal | 1900 | 6/28-9/4 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Tom McCreery | mccree001tho | 1900 | 4/22-10/13 | 43 g. | Pittsburgh | National League | Pittsburgh, PA |
| Jack McCusker | 1900 | Phil.-Crescents | Independent | Philadelphia, PA | |||
| Jack McCusker | 1900 | Norristown | Independent | Norristown, PA | |||
| Jimmy McDade | mcdade001jam | 1900 | , | ||||
| Sandy McDermott | mcderm001san | 1900 | , | ||||
| Will McDevitt | mcdevi001wil | 1900 | 98 g. | Decatur Commodores | Central League | Decatur, IL | |
| McDonald | mcdona006--- | 1900 | 6/11-6/13 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Charles McDonald | mcdona004cha | 1900 | 5/5-9/2 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Jim McDonald | mcdona003jim | 1900 | 4/19-9/18 | Umpire | Amateur | , | |
| Jim McDonald | mcdona003jim | 1900 | Umpire | California League | , | ||
| Mike McDonough | mcdono001mik | 1900 | -9/23 | 30 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Sandy McDougal | mcdoug002joh | 1900 | 5/2-6/11 | Elmira | Atlantic League | Elmira, NY | |
| Sandy McDougal | mcdoug002joh | 1900 | 8/16 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| James McDowell | mcdowe002jam | 1900 | St. Louis Univ. | College | , | ||
| Pryor McElveen | mcelve001pry | 1900-03 | Carson-Newman | College | , | ||
| Barney McFadden | mcfadd001ber | 1900 | Villanova College | College | , | ||
| Barney McFadden | mcfadd001ber | 1900 | Chester | Independent | Chester, PA | ||
| Barney McFadden | mcfadd001ber | 1900 | Cincinnati Mountain AC | Independent | Cincinnati, OH | ||
| Fred McFall | mcfall001fre | 1900 | 5/12- | 42 g. | Cortland Wagonmakers | New York State League | Cortland, NY |
| Dan McFarlan | mcfarl002dan | 1900 | 4/28-9/15 | Montreal Royals | Eastern League | Montreal, QC | |
| Chappie McFarland | mcfarl002cha | 1900 | 31 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Ed McFarland | mcfarl002edw | 1900 | 4/19-10/10 | 94 g. | Philadelphia | National League | Philadelphia, PA |
| Herm McFarland | mcfarl001her | 1900 | 4/21-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Monte McFarland | mcfarl001mon | 1900 | 5/1-5/21 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Monte McFarland | mcfarl001mon | 1900 | 6/8-7/14 | New Castle Quakers | Interstate League | New Castle, PA | |
| Dan McGann | mcgann001den | 1900 | 4/19-9/29 | 121 g. | St. Louis | National League | St. Louis, MO |
| McGill | mcgill004--- | 1900 | +4/28+ | Reading Browns | Amateur | Reading, PA | |
| McGill | mcgill010--- | 1900 | +5/23-6/8 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Charles McGill | mcgill002cha | 1900 | 4/30-5/3 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Willie McGill | mcgill005wil | 1900 | 5/6-5/30 | Chicago White Stockings | American League | Chicago, IL | |
| McGilvray | mcgilv001--- | 1900 | 5 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| McGinnis | mcginn006--- | 1900 | 6/29-7/17 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Joe McGinnity | mcginn001jos | 1900 | 4/21-10/13 | 46 g. | Brooklyn | National League | Brooklyn, NY |
| John McGraw | mcgraw003joh | 1900 | 5/12-10/14 | 99 g. | St. Louis | National League | St. Louis, MO |
| Eugene McGreevy | mcgree001eug | 1900 | 74 g. | Bloomington Blues | Central League | Bloomington, IL | |
| McGrew | mcgrew005--- | 1900 | 13 g. | Helena Senators | Montana State League | Helena, MT | |
| Marty McGuane | mcguan001mar | 1900 | Lowell-All Pros | Independent | Lowell, MA | ||
| Joe McGuckin | mcguck001joe | 1900 | 51 g. | Stockton Wasps | California League | Stockton, CA | |
| McGuire | mcguir014--- | 1900 | 7/9-7/10 | Hampton Crabs | Virginia League | Hampton, VA | |
| McGuire | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | ||
| Deacon McGuire | mcguir006jam | 1900 | 4/19-10/12 | 71 g. | Brooklyn | National League | Brooklyn, NY |
| Frank McGuire | mcguir001fra | 1900 | 91 g. | Danville Champions | Central League | Danville, IL | |
| Jim McGuire | mcguir001jam | 1900 | 5/11- | 95 g. | Rome Romans | New York State League | Rome, NY |
| Thomas McGuire | mcguir004--- | 1900 | 4/30- | Jersey City City | Atlantic League | Jersey City, NJ | |
| Thomas McGuire | mcguir004--- | 1900 | -6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Thomas McGuire | mcguir004--- | 1900 | +7/19-7/30 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Thomas McGuirk | mcguir004tho | 1900 | 4/30-5/2 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Thomas McGuirk | mcguir004tho | 1900 | 5/14-5/28 | Umpire | Virginia League | , | |
| Bob McHale | mchale001bob | 1900 | 4/1-5/6 | Stockton Wasps | California League | Stockton, CA | |
| Bob McHale | mchale001bob | 1900 | 98 g. | Pueblo Indians | Western League | Pueblo, CO | |
| Bob McHale | mchale001bob | 1900 | 9/16-12/22 | Stockton Wasps | California League | Stockton, CA | |
| Jesse McHale | 1900 | Schenectady Electricians | New York State League | Schenectady, NY | |||
| Jim McHale | mchale001jam | 1900 | 5/22-9/23 | Anaconda Serpents | Montana State League | Anaconda, MT | |
| T. McHale | mchale001t-- | 1900 | 5/5-5/27 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| John McIlvaine | mcilva003joh | 1900 | 5/9 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| John McIlvaine | mcilva003joh | 1900 | 2 g. | Peoria Distillers | Central League | Peoria, IL | |
| John McInnes | mcinne001joh | 1900 | 5/14 | New London Whalers | Connecticut State League | New London, CT | |
| John McInnes | mcinne001joh | 1900 | 5/22-6/11 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Harry McIntire | mcinti001joh | 1900 | 47 g. | Danville Champions | Central League | Danville, IL | |
| Butch McIntyre | mcinty001cha | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| James McJames | mcjame001jam | 1900 | +5/23+ | Cheraw SC | Independent | Cheraw, SC | |
| McKee | mckee-005--- | 1900 | 1 g. | Decatur Commodores | Central League | Decatur, IL | |
| Jimmy McKeever | mckeev001jam | 1900 | Umpire | International League | , | ||
| Kit McKenna | mckenn001kit | 1900 | 5/9-8/10 | Cleveland Lake Shores | American League | Cleveland, OH | |
| McKenzie | mckenz011--- | 1900 | 70 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| McKenzie | 1900 | 4 g. | Fresno | San Joaquin | Fresno, CA | ||
| Francis McKeon | mckeon001fra | 1900 | Worc.-St.Aloysius | Independent | Worcester, MA | ||
| Francis McKeon | mckeon001fra | 1900-04 | Holy Cross | College | , | ||
| James McKevitt | mckevi001jam | 1900 | 4/28-5/2 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| James McKevitt | mckevi001jam | 1900 | 5/26-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| James McKevitt | mckevi001jam | 1900 | 7/10-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| Byron McKibben | mckibb001byr | 1900 | 5/5-9/3 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Byron McKibben | mckibb001byr | 1900 | -9/23 | 15 g. | Helena Senators | Montana State League | Helena, MT |
| Ed McLane | mclane001edw | 1900-07 | Fordham College | College | , | ||
| Ed McLane | mclane001edw | 1900-07 | U. of Maryland | College | , | ||
| Robert McLatchie | 1900 | , | |||||
| McLaughlin | mclaug008--- | 1900 | 6/5-6/6 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| George McLaughlin | mclaug003geo | 1900 | 88 g. | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Michael McLaughlin | mclaug004mic | 1900 | 5/1-5/7 | Newark Colts | Atlantic League | Newark, NJ | |
| Michael McLaughlin | 1900 | 5/11-6/14 | Umpire | New York State League | , | ||
| Warren McLaughlin | mclaug001war | 1900 | 7/7 | 1 g. | Philadelphia | National League | Philadelphia, PA |
| Sam McLean | mclean001fra | 1900 | U. Connecticut | College | , | ||
| Sam McLean | mclean001fra | 1900 | 6/9-9/4 | Derby Angels | Connecticut State League | Derby, CT | |
| Sam McMackin | mcmack001sam | 1900 | 5/7 | Elmira | Atlantic League | Elmira, NY | |
| Sam McMackin | mcmack001sam | 1900 | 28 g. | Decatur Commodores | Central League | Decatur, IL | |
| John McMakin | mcmaki001joh | 1900-01 | Clemson Univ. | College | , | ||
| John McMakin | mcmaki001joh | 1900 | 6/27-7/20 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Frank McManus | mcmanu001fra | 1900 | 4/30-6/4 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Frank McManus | mcmanu001fra | 1900 | 6/22-7/27 | Chicago White Stockings | American League | Chicago, IL | |
| Frank McManus | mcmanu001fra | 1900 | 7/30-9/17 | Kansas City Blues | American League | Kansas City, MO | |
| Bill McNamara | mcnama001wil | 1900 | 5/11-7/21 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Bill McNamara | mcnama001wil | 1900 | 7/23-9/8 | Albany Senators | New York State League | Albany, NY | |
| Thomas McNamara | 1900 | 7/20-7/26 | Umpire | New York State League | , | ||
| Hugh McNeeley | mcneel001har | 1900 | 5/9-9/4 | Denver Grizzlies | Western League | Denver, CO | |
| Frank McPartlin | mcpart002fra | 1900 | 4/28-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| McPhee | mcphee001--- | 1900 | 2 g. | Azusa | Southern California League | Azusa, CA | |
| James McQuaid | mcquai001jam | 1900 | 5/11- | 99 g. | Troy Washerwomen | New York State League | Troy, NY |
| Mart McQuaid | mcquai001mor | 1900 | 5 g. | Stockton Wasps | California League | Stockton, CA | |
| James McShane | mcshan001j-- | 1900 | Wabash | Indiana State League | Wabash, IN | ||
| F. J. McTeer | 1900-01 | Tufts College | College | , | |||
| Ira McTeer | mcteer002--- | 1900 | +4/30+ | Knoxville | Independent | Knoxville, TN | |
| Carl McVey | mcvey-001car | 1900 | 118 g. | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Mattie McVicker | mcvick001mat | 1900 | 5/5-9/4 | Omaha Omahogs | Western League | Omaha, NE | |
| Mattie McVicker | mcvick001mat | 1900 | -9/23 | 15 g. | Helena Senators | Montana State League | Helena, MT |
| Gil Mead | mead--001--- | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Phil Meade | meade-001phi | 1900 | 7/3-8/4 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Phil Meade | meade-001phi | 1900 | Concord | Independent | Concord, NC | ||
| Meagher | 1900 | Riverside-NYC | Independent | Riverside, NY | |||
| Pat Meaney | meaney002pat | 1900 | 4/28-9/2 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Thomas Means | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | |||
| Jouett Meekin | meekin002jou | 1900 | 6/17-7/8 | 2 g. | Pittsburgh | National League | Pittsburgh, PA |
| Billy Mehl | mehl--001wil | 1900 | Hoboken | Independent | Hoboken, NJ | ||
| Kid Melcher | melche001--- | 1900 | Norristown | Independent | Norristown, PA | ||
| John Menefee | menefe001joh | 1900 | 4/19-10/13 | 17 g. | Chicago | National League | Chicago, IL |
| Tom Menefee | menefe001tho | 1900 | -9/23 | 58 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Bernardo Menendez | menend000ber | 1900 | Habana | Cuban League | , | ||
| Win Mercer | mercer001geo | 1900 | 4/19-10/6 | 76 g. | New York | National League | New York, NY |
| Elmer Meredith | meredi001elm | 1900 | 4/29-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Horace Merkle | merkle001hor | 1900 | 5/22- | 8 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| George Merritt | merrit002geo | 1900 | 5/1 | Toronto Canucks | Eastern League | Toronto, ON | |
| George Merritt | merrit002geo | 1900 | 5/3-5/21 | Newark Colts | Atlantic League | Newark, NJ | |
| George Merritt | merrit002geo | 1900 | no g. | Derby Angels | Connecticut State League | Derby, CT | |
| Sam Mertes | mertes001sam | 1900 | 4/19-10/7 | 127 g. | Chicago | National League | Chicago, IL |
| Mertsch | mertsc001--- | 1900 | 5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Tom Messitt | messit001tom | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Tom Messitt | messit001tom | 1900 | 6/21-8/2 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Tom Messitt | messit001tom | 1900 | 8/18-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Metz | metz--012--- | 1900 | +5/6-6/8 | Kokomo | Indiana State League | Kokomo, IN | |
| Charles Meyers | meyers003cha | 1900 | 4/30-6/16 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Charlie Middleton | middle002cha | 1900 | 17 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Charlie Middleton | middle002cha | 1900 | 8/5-9/16 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Marion, IN | |
| Daniel Miguel | miguel001dan | 1900 | Cubano | Cuban League | , | ||
| Ed Millard | 1900 | 15 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Edward Millard | millar003--- | 1900 | 5/2-5/14 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| George Millard | 1900 | 3 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Miller | miller007--- | 1900 | 5/21-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Miller | miller009--- | 1900 | 6/11-6/19 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Miller | miller258--- | 1900 | 7/12-7/13 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Miller | miller085--- | 1900 | 9/3-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Miller | miller063--- | 1900 | 6/16 | Hampton Crabs | Virginia League | Hampton, VA | |
| Al Miller | miller003alb | 1900 | 4/28-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| Alexander Miller | miller007w-- | 1900 | 6/4-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Bert Miller | miller002ber | 1900 | Clarksville MI | Independent | Clarksville, MI | ||
| Bert Miller | miller002ber | 1900 | Portland MI | Independent | Portland, MI | ||
| Charles Miller | miller019cha | 1900 | +6/8 | Kokomo | Indiana State League | Kokomo, IN | |
| Connie Miller | miller001con | 1900 | 6/11-7/16 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Dan Miller | 1900-01 | PA State Univ. | College | , | |||
| Dusty Miller | miller001dak | 1900 | no g. | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Dusty Miller | miller001dak | 1900 | 101 g. | Denver Grizzlies | Western League | Denver, CO | |
| George Miller | miller005geo | 1900 | 4/28-9/16 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Joe Miller | miller006joe | 1900 | 5/11-6/12 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| John Miller | miller022joh | 1900 | 6/6-6/7 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Joseph Miller | miller000can | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Kohly Miller | miller001koh | 1900 | 4/28-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Pete Miller | miller001pet | 1900 | 5/2 | Scranton Miners | Atlantic League | Scranton, PA | |
| Ralph Miller | miller007ral | 1900 | 4/30 | Worcester Farmers | Eastern League | Worcester, MA | |
| Ralph Miller | miller007ral | 1900 | 5/19-9/18 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Roscoe Miller | miller001ros | 1900 | 4/20-8/19 | Detroit Tigers | American League | Detroit, MI | |
| Pat Millerick | miller002pat | 1900 | 5/6-6/7 | Scranton Miners | Atlantic League | Scranton, PA | |
| Pat Millerick | miller002pat | 1900 | no g. | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Mike Millett | millet001mic | 1900 | 5/2-5/23 | Newark Colts | Atlantic League | Newark, NJ | |
| Mike Millett | millet001mic | 1900 | -6/20 | Troy Washerwomen | New York State League | Troy, NY | |
| Mike Millett | millet001mic | 1900 | 11 g. | Decatur Commodores | Central League | Decatur, IL | |
| Mike Millett | millet001mic | 1900 | 7/22-8/4 | Newark Colts | Atlantic League | Newark, NJ | |
| Billy Milligan | millig002wil | 1900 | 4/20-4/27 | Buffalo Bisons | American League | Buffalo, NY | |
| Billy Milligan | millig002wil | 1900 | 5/9-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Billy Milligan | millig002wil | 1900 | 6/25-7/4 | Buffalo Bisons | American League | Buffalo, NY | |
| Billy Milligan | millig002wil | 1900 | 7/22-9/15 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Mills | mills-049--- | 1900 | 6/28-7/2+ | Wilmington | North Carolina Association | Wilmington, NC | |
| Mills | mills-038--- | 1900 | 6/25-6/29 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Sam Mills | mills-001sam | 1900 | 5/3-5/17 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Sam Mills | mills-038--- | 1900 | 6/25-6/29 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Sam Mills | mills-002sam | 1900 | 5/10-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Willie Mills | mills-004wil | 1900 | 5/12-9/7 | Utica Reds | New York State League | Utica, NY | |
| Larry Milton | milton001sam | 1900 | Pittsburg | Independent | Pittsburg, KS | ||
| Larry Milton | milton001sam | 1900 | 8/28-9/3 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Cotton Minahan | minaha001edm | 1900-04 | Georgetown | College | , | ||
| Jack Miran | miran-001joh | 1900 | +5/15-8/8 | Troy Washerwomen | New York State League | Troy, NY | |
| Jack Miran | miran-001joh | 1900 | 8/9 | Albany Senators | New York State League | Albany, NY | |
| Mischey | mische001--- | 1900 | 6/7-6/9 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Mitchell | mitche081--- | 1900 | Chicago Unions | Black Baseball | Chicago, IL | ||
| Fred Mitchell | mitche005fre | 1900 | St. John,New Brunswick | Independent | St. John, NB | ||
| Clifford Mitts | mitts-001cli | 1900 | 5/10-? | Grand Rapids Boers | International League | Grand Rapids, MI | |
| C.E. Mizell | mizell000ce- | 1900 | +6/27+ | Plymouth NC | Independent | Plymouth, NC | |
| C.E. Mizell | mizell000ce- | 1900 | +7/5-7/27+ | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Homer Mock | mock--001hom | 1900 | -10/14 | Canton | Independent | Canton, OH | |
| Frank Moffett | moffet001fra | 1900 | Rome GA | Independent | Rome, GA | ||
| Kid Mohler | mohler001kid | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Kid Mohler | mohler001kid | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Kid Mohler | mohler001kid | 1900 | 21 g. | Denver Grizzlies | Western League | Denver, CO | |
| Carlton Molesworth | molesw001car | 1900 | 5/11- | Schenectady Electricians | New York State League | Schenectady, NY | |
| Carlton Molesworth | molesw001car | 1900 | 6/7-6/11 | Elmira | Atlantic League | Elmira, NY | |
| Carlton Molesworth | molesw001car | 1900 | 6/12-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Tinti Molina | molina000tin | 1900 | Cubano | Cuban League | , | ||
| Mollenry | mollen003--- | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| Mollenry? | 1900 | 8/24 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Monroe | monroe008--- | 1900 | 7/18-7/21 | New Castle Quakers | Interstate League | New Castle, PA | |
| Babe Monroe | monroe001w-- | 1900 | 13 g. | Fresno | San Joaquin | Fresno, CA | |
| Bill Monroe | monroe000bil | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | ||
| Bill Monroe | monroe000bil | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Warren Monroe | 1900 | 11 g. | Fresno | San Joaquin | Fresno, CA | ||
| Roy Montgomery | montgo001roy | 1900 | 94 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Roy Montgomery | montgo001roy | 1900 | 7/24-8/2 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Carl Moore | moore-007car | 1900 | +5/25+ | Smith Center KS | Independent | Smith Center, KS | |
| Carl Moore | moore-007car | 1900 | Winfield | Independent | Winfield, KS | ||
| Carl Moore | moore-001car | 1900 | Williams College | College | , | ||
| Earl Moore | moore-001ear | 1900 | 4/28-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| F.M. Moore | moore-002f-- | 1900 | 6 g. | Helena Senators | Montana State League | Helena, MT | |
| F.M. Moore | moore-002f-- | 1900 | 1 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Fred Moore | 1900-03 | U. Alabama | College | , | |||
| Harry Moore | moore-006har | 1900 | Chicago Unions | Black Baseball | Chicago, IL | ||
| Jack Moore | moore-002jac | 1900 | 7 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Mose Moore | moore-001mos | 1900 | 1 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Mose Moore | moore-001edw | 1900 | 88 g. | Stockton Wasps | California League | Stockton, CA | |
| Wade Moore | moore-001wad | 1900 | Washburn College | College | , | ||
| Wade Moore | moore-001wad | 1900 | Salina | Independent | Salina, KS | ||
| Augie Moran | moran-002aug | 1900 | 4/30-5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Augie Moran | moran-002aug | 1900 | 6/26-9/4 | Pueblo Indians | Western League | Pueblo, CO | |
| Carlos Moran | moran-002car | 1900 | San Francisco | Cuban League | , | ||
| Francisco Moran | moran-002fra | 1900 | San Francisco | Cuban League | , | ||
| Pat Moran | moran-002pat | 1900 | 4/26-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| William Moreing | morein001wil | 1900 | 1 g. | Stockton Wasps | California League | Stockton, CA | |
| E. B. Morgan | 1900 | Umpire | Atlantic League | , | |||
| Ezra Morgan | morgan001ezr | 1900 | 5/10-7/11 | New London Whalers | Connecticut State League | New London, CT | |
| Ezra Morgan | morgan001ezr | 1900 | 7/14-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Otis Morgan | morgan001oti | 1900 | 10 g. | Decatur Commodores | Central League | Decatur, IL | |
| Otis Morgan | morgan001oti | 1900 | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| Otis Morgan | morgan001oti | 1900 | Peoria Distillers | Central League | Peoria, IL | ||
| Red Morgan | morgan003jam | 1900-01 | Notre Dame | College | , | ||
| Morris | morris105--- | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Morris | 1900 | Reading Browns | Independent | Reading, PA | |||
| Morris | morris029--- | 1900 | +5/24-6/3+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Bill Morris | 1900 | New London Whalers | Connecticut State League | New London, CT | |||
| Kid Morris | morris010wil | 1900 | 5/1-5/14 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Kid Morris | morris010wil | 1900 | 5/17 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Kid Morris | morris010wil | 1900 | 5/30-6/2 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Kid Morris | morris010wil | 1900 | 6/14 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Bill Morrison | morris008wil | 1900 | +5/13-8/28 | Albany Senators | New York State League | Albany, NY | |
| John Morrison | morris014joh | 1900 | 5/30-6/4 | New London Whalers | Connecticut State League | New London, CT | |
| Frank Morrissey | morris003mic | 1900 | 5/21-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| William Morrow | morrow002wil | 1900 | 4/1- | 40 g. | Stockton Wasps | California League | Stockton, CA |
| Charles Morse | morse-001cha | 1900 | 4/27-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| W.H. Morton | morton000wh- | 1900 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | ||
| Doc Moskiman | moskim001wil | 1900 | 4/1-12/2 | Oakland Oaks | California League | Oakland, CA | |
| Charles Moss | moss--003cha | 1900 | -8/4 | 60 g. | Binghamton Crickets | New York State League | Binghamton, NY |
| Frank Motz | motz--001fra | 1900 | no g. | Chicago White Stockings | American League | Chicago, IL | |
| Hugh Mulholland | 1900 | Umpire | Atlantic League | , | |||
| Cy Mulkey | mulkey001cyr | 1900 | , | ||||
| Frank Mullane | mullan001fra | 1900 | +8/5+ | Minneapiolis Brewers | Amateur | Minneapolis, MN | |
| Tony Mullane | mullan001ton | 1900 | did not play | , | |||
| Dominic Mullaney | mullan002dom | 1900 | 4/30-6/15 | Hampton Crabs | Virginia League | Hampton, VA | |
| Max Muller | muller002max | 1900 | 5 g. | Stockton Wasps | California League | Stockton, CA | |
| Max Muller | muller002max | 1900 | San Francisco Brewers | California League | San Francisco, CA | ||
| Max Muller | muller002max | 1900 | 5/22-9/23 | Great Falls Indians | Montana State League | Great Falls, MT | |
| George Mullin | mullin001geo | 1900 | 6/3+ | Wabash | Indiana State League | Wabash, IN | |
| George Mullin | mullin001geo | 1900 | South Bend | Independent | South Bend, IN | ||
| John Mullin | mullin001joh | 1900 | Wilmington | Independent | Wilmington, DE | ||
| John Mullin | mullin001joh | 1900 | no g. | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Michael Mullin | mullen001mic | 1900 | 5/11-9/8 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| José Munoz | munoz-008jos | 1900 | Almendarista | Cuban League | , | ||
| Munson | 1900 | 2 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Munson | 1900 | 2 g. | Hanford | San Joaquin | Hanford, CA | ||
| Murphy | murphy067--- | 1900 | 6/20-6/21 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Murphy | murphy104--- | 1900 | 6/13-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Murphy | murphy104--- | 1900 | 8/6-8/19 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Murphy | murphy011--- | 1900 | 1 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Danny Murphy | murphy006dan | 1900 | -5/ | North Adams | Independent | North Adams, MA | |
| Danny Murphy | murphy006dan | 1900 | +5/18-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Danny Murphy | murphy006dan | 1900 | 9/17-10/13 | 22 g. | New York | National League | New York, NY |
| Dave Murphy | murphy001dav | 1900 | -5/ | North Adams | Independent | North Adams, MA | |
| Dave Murphy | murphy001dav | 1900 | 5/10-7/11 | New London Whalers | Connecticut State League | New London, CT | |
| Dave Murphy | murphy001dav | 1900 | 7/14-8/3 | Derby Angels | Connecticut State League | Derby, CT | |
| Ed Murphy | murphy005edw | 1900 | 4/26-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Frank Murphy | murphy004fra | 1900 | 5/10-5/14 | Derby Angels | Connecticut State League | Derby, CT | |
| Frank Murphy | murphy004fra | 1900 | 6/25-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| Frank Murphy | murphy004fra | 1900 | Columbia U. '01-MD? | , | |||
| J. Murphy | murphy008j-- | 1900 | 5/30 | Syracuse Stars | Eastern League | Syracuse, NY | |
| J.E. Murphy | murphy000je- | 1900 | 6/25-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| John Murphy | murphy028joh | 1900s | Polo Grounds | , | |||
| John Murphy | murphy018joh | 1900 | 5/10-5/16 | New Haven Blues | Connecticut State League | New Haven, CT | |
| John Murphy | murphy018joh | 1900 | 6/5 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Morgan Murphy | murphy001mor | 1900 | 8/6-8/31 | 11 g. | Philadelphia | National League | Philadelphia, PA |
| Thomas Murphy | murphy001tho | 1900 | 4/30- | Newark Colts | Atlantic League | Newark, NJ | |
| Thomas Murphy | murphy001tho | 1900 | -6/11 | Elmira | Atlantic League | Elmira, NY | |
| Thomas Murphy | 1900 | Cambridge Latin | High School | , | |||
| Thomas Murphy | 1900-04 | Harvard Univ. | College | , | |||
| Thomas Murphy | 1900-04 | Harvard Univ. | College | , | |||
| Yale Murphy | murphy001yal | 1900 | -9/8 | 55 g. | Binghamton Crickets | New York State League | Binghamton, NY |
| Murray | murray003--- | 1900 | 1 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Murray | murray004--- | 1900 | 5 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Murray | murray070--- | 1900 | Raleigh Senators | North Carolina Association | Raleigh, NC | ||
| Billy Murray | murray007wil | 1900 | 7/27 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Jim Murray | murray008jam | 1900 | 4/30-7/10+ | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Miah Murray | murray001mia | 1900 | 1 g. | MLB Umpire | National League | , | |
| Bade Myers | myers-002wil | 1900 | 4/28-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| Bert Myers | myers-001ber | 1900 | 4/19-4/27 | 7 g. | Philadelphia | National League | Philadelphia, PA |
| Bert Myers | myers-001ber | 1900 | 5/1-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| C. Myers | 1900 | no g. | Bloomington Blues | Central League | Bloomington, IL | ||
| Phil Nadeau | nadeau001phi | 1900 | +5/16-9/8 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Nagle | nagle-008--- | 1900 | 6/2 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Paul Nagle | nagle-001lef | 1900 | 4/19-4/27 | Kansas City Blues | American League | Kansas City, MO | |
| Paul Nagle | nagle-001lef | 1900 | 91 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| William Nance | nance-001wil | 1900 | 4/19-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Billy Nattress | nattre001wil | 1900 | 4/28-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Neal | neal--002--- | 1900 | 5/10-7/4 | Chatham Reds | International League | Chatham, ON | |
| Philip Neal | neal--001phi | 1900 | 14 g. | Helena Senators | Montana State League | Helena, MT | |
| Tom Needham | needha001tho | 1900 | Ashtabula | Independent | Ashtabula, OH | ||
| Tom Needham | needha001tho | 1900 | Dubois | Independent | Dubois, PA | ||
| Neil | neil--001--- | 1900 | +5/26- | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Henry Nelson | nelson001hen | 1900 | 4/30-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Jack Nelson | nelson002jac | 1900 | 4/23 | Buffalo Bisons | American League | Buffalo, NY | |
| John Nelson | nelson008joh | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Joseph Netolicky | 1900-04 | Coe College | College | , | |||
| Mike Neville | nevill001mic | 1900 | 5/11-7/26 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Mike Neville | nevill001mic | 1900 | 8/1-8/29 | Albany Senators | New York State League | Albany, NY | |
| Newberger | newber006--- | 1900 | Wabash | Indiana State League | Wabash, IN | ||
| Newman | newman027--- | 1900 | U. Tennessee | College | , | ||
| Newman | newman027--- | 1900 | Rome GA | Independent | Rome, GA | ||
| Newman | newman027--- | 1900 | Wilmington | North Carolina Association | Wilmington, NC | ||
| Harry Newmeyer | newmey001har | 1900 | 37 g. | Omaha Omahogs | Western League | Omaha, NE | |
| Rollie Newport | 1900 | 6 g. | Hanford | San Joaquin | Hanford, CA | ||
| Tom News | news--001tho | 1900 | 4/30-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Doc Newton | newton001eus | 1900 | 4/27-10/7 | 36 g. | Cincinnati | National League | Cincinnati, OH |
| Nichols | nichol021--- | 1900 | 6/14 | Denver Grizzlies | Western League | Denver, CO | |
| Art Nichols | nichol001art | 1900 | 5/4-5/15 | 8 g. | Chicago | National League | Chicago, IL |
| Art Nichols | nichol001art | 1900 | 6/19-6/27 | 8 g. | Chicago | National League | Chicago, IL |
| Art Nichols | nichol001art | 1900 | 8/8-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Art Nichols | nichol001art | 1900 | 9/30 | 8 g. | Chicago | National League | Chicago, IL |
| Joe Nichols | nichol005jos | 1900 | Newark Colts | Atlantic League | Newark, NJ | ||
| Kid Nichols | nichol006cha | 1900 | 4/19-10/12 | 29 g. | Boston | National League | Boston, MA |
| Nick | nick--001--- | 1900 | 6/11 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| George Nicol | nicol-001geo | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| George Nicol | nicol-001geo | 1900 | 6/19-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Tom Niland | niland001tom | 1900 | +7/7+ | Amesbury | Independent | Amesbury, MA | |
| Bill Niles | niles-001bil | 1900 | 93 g. | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| George Nill | nill--001geo | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Charles Nipper | nipper001cha | 1900 | 5/4-5/14 | Manchester | Manchester, | ||
| Charles Nipper | nipper001cha | 1900 | 6/4-6/15 | Hampton Crabs | Virginia League | Hampton, VA | |
| Charles Nipper | nipper001cha | 1900 | Mansfield Haymakers | Interstate League | Mansfield, OH | ||
| Niven | niven-001--- | 1900 | 5/4 | Scranton Miners | Atlantic League | Scranton, PA | |
| George Noblit | noblit001geo | 1900 | 4/26-5/31 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| George Noblit | noblit001geo | 1900 | 6/27-8/3 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Nolan | nolan-012--- | 1900 | 8/20 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| John Nolan | nolan-030--- | 1900 | +10/14 | Massillon OH | Independent | Massillon, OH | |
| Theodore Nolan | 1900 | Decatur Commodores | Central League | Decatur, IL | |||
| Joe Nonemaker | nonama001jos | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Joe Nonemaker | nonama001jos | 1900 | 8/21-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Joe Nonemaker | nonama001jos | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| Pete Noonan | noonan001pet | 1900-03 | Holy Cross Col. | College | , | ||
| William Noonan | noonan001wil | 1900 | 49 g. | Danville Champions | Central League | Danville, IL | |
| William Noonan | noonan001wil | 1900 | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| Jerry Nops | nops--001jer | 1900 | 5/30-7/31 | 9 g. | Brooklyn | National League | Brooklyn, NY |
| Jerry Nops | nops--001jer | 1900 | 8/30-9/3 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Frank Norcom | norcom001fra | 1900 | 5/11-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Frank Norcom | norcom001fra | 1900 | Albany Senators | New York State League | Albany, NY | ||
| Lou Nordyke | nordyk001lou | 1900 | Ashtabula | Independent | Ashtabula, OH | ||
| Lou Nordyke | nordyk001lou | 1900 | 7/18-9/15 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Harry Norris | norris003har | 1900 | 16 g. | Springfield/Jacksonville | Central League | Jacksonville, IL | |
| Arthur Noyes | noyes-001art | 1900 | Waco | Independent | Waco, TX | ||
| Harry Noyes | noyes-001har | 1900 | 4/30-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| Harry Noyes | noyes-001har | 1900 | 6/7-9/7 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Harry Noyes | noyes-001har | 1900 | 9/8-9/11 | Worcester Farmers | Eastern League | Worcester, MA | |
| Charlie Nyce | nyce--002cha | 1900 | 4/30-6/9 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Charlie Nyce | nyce--002cha | 1900 | 7/13-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| O'Brien | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | ||
| O'Brien | obrien046--- | 1900 | 5/4-5/8 | Jersey City City | Atlantic League | Jersey City, NJ | |
| O'Brien | obrien056--- | 1900 | 3 g. | Azusa | Southern California League | Azusa, CA | |
| O'Brien | obrien005--- | 1900 | 5/5-7/11 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Daily O'Brien | obrien001dai | 1900 | 4/30-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Daily O'Brien | obrien001dai | 1900 | 6/25-7/24+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Derry O'Brien | obrien001der | 1900 | Kokomo | Indiana State League | Kokomo, IN | ||
| Frank O'Brien | 1900 | Plattsburgh HS | High School | , | |||
| George O'Brien | obrien001geo | 1900 | CtSt | , | |||
| Jack O'Brien | obrien005joh | 1900 | 4/19-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Jack O'Brien | obrien013joh | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Jack O'Brien | obrien013joh | 1900 | 6/20-7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Jack O'Brien | obrien013joh | 1900 | 7/30-8/18 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| James O'Brien | obrien004jam | 1900 | 5/10-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| John O'Brien | obrien009joh | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| John O'Brien | obrien009joh | 1900 | 6/27-7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| John O'Brien | obrien009joh | 1900 | 7/30-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| John O'Brien | obrien014joh | 1900 | Calciners | Independent | , | ||
| John O'Brien | obrien014joh | 1900 | -9/23 | 51 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| John O'Brien | 1900 | no g. | New Haven Blues | Connecticut State League | New Haven, CT | ||
| Pat O'Brien | obrien001pat | 1900 | Indianapolis Hoosiers | American League | Indianapolis, IN | ||
| Pat O'Brien | obrien001pat | 1900 | 1 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Pete O'Brien | obrien001pet | 1900 | +5/16-9/8 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Tom O'Brien | obrien001tom | 1900 | 5/11-9/8 | Rome Romans | New York State League | Rome, NY | |
| Tom O'Brien | obrien002tom | 1900 | 4/19-10/13 | 102 g. | Pittsburgh | National League | Pittsburgh, PA |
| O'Connell | 1900 | Winsted-TAB | Independent | Winsted, CT | |||
| John O'Connell | oconne003joh | 1900 | 5/5-9/1 | Omaha Omahogs | Western League | Omaha, NE | |
| Tim O'Connell | oconne002tim | 1900 | 5/10-7/1 | Chatham Reds | International League | Chatham, ON | |
| Eugene O'Connor | oconno001eug | 1900 | 5/10-6/6 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Eugene O'Connor | oconno001eug | 1900 | 6/16-6/25 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Jack O'Connor | oconno006joh | 1900 | 4/19-5/6 | 10 g. | St. Louis | National League | St. Louis, MO |
| Jack O'Connor | oconno006joh | 1900 | 5/30-10/12 | 43 g. | Pittsburgh | National League | Pittsburgh, PA |
| M. O'Connor | oconno001m-- | 1900 | 5/12-6/17 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Michael O'Connor | oconno001mic | 1900 | 4/28-8/1 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Michael O'Connor | oconno001mic | 1900 | 8/9-8/12 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Michael O'Connor | oconno001mic | 1900 | -9/15 | 11 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Michael O'Connor | oconno001mic | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| Royes O'Connor | oconno001roy | 1900 | Elmi.-FatherMathew | Independent | Elmira, NY | ||
| Artie O'Dea | odea--001art | 1900 | 5/5-6/6 | Pueblo Indians | Western League | Pueblo, CO | |
| Artie O'Dea | odea--001art | 1900 | 6/9-6/28 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| O'Gorman | ogorma001--- | 1900 | 5/14 | Derby Angels | Connecticut State League | Derby, CT | |
| Hal O'Hagan | ohagen001har | 1900 | 4/26-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Jim O'Keefe | okeefe001jim | 1900 | Kokomo | Indiana State League | Kokomo, IN | ||
| Charley O'Leary | oleary001cha | 1900 | Chicago Mandel | Independent | Chicago, IL | ||
| Charley O'Leary | oleary001cha | 1900 | 7/25-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| O'Loughlin | 1900 | Derby Angels | Connecticut State League | Derby, CT | |||
| Francis O'Loughlin | olough001sil | 1900 | 4/26-9/23 | Umpire | Eastern League | , | |
| Harry O'Neil | oneil-000har | 1900 | 5/2- | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Harry O'Neil | oneil-000har | 1900 | -5/17 | Elmira | Atlantic League | Elmira, NY | |
| Jack O'Neill | oneill008joh | 1900 | 5/1-5/26 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Jack O'Neill | oneill008joh | 1900 | Utica Reds | New York State League | Utica, NY | ||
| Joseph O'Neill | 1900 | Jacksonville FL | Independent | Jacksonville, FL | |||
| Mike O'Neill | oneill002mic | 1900 | Villanova | College | , | ||
| Tip O'Neill | oneill001tip | 1900 | 7/21-8/5 | Umpire | Eastern League | , | |
| O'Rourke | orourk010--- | 1900 | 6/17 | Milwaukee Brewers | American League | Milwaukee, WI | |
| O'Rourke | orourk008--- | 1900 | +5/30- | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Jim O'Rourke | orourk003jam | 1900 | 5/10-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Thomas O'Rourke | orourk003tho | 1900 | 5/11-6/17 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Tim O'Rourke | orourk003tim | 1900 | no g. | Bloomington Blues | Central League | Bloomington, IL | |
| Tim O'Rourke | orourk003tim | 1900 | 6/24-8/19 | Omaha Omahogs | Western League | Omaha, NE | |
| Tony Odegard | odegar001--- | 1900 | +5/26+ | Buxton | Independent | Buxton, ND | |
| Tony Odegard | odegar001--- | 1900 | +7/1-8/5+ | Minn.-Brewers | Independent | Minneapolis, MN | |
| Fred Odwell | odwell001fre | 1900 | 4/26-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| Kid Ogden | ogden-001lou | 1900 | +5/10+ | Muncie | Indiana State League | Muncie, IN | |
| John Ogee | ogee--001joh | 1900 | 86 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Jesse Oldham | oldham000jes | 1900 | +3/23+ | Horner School | School | , | |
| Jesse Oldham | oldham000jes | 1900 | 6/27-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Reginald Ollre | ollre-001rox | 1900-02 | Hous.-Firemen | Independent | Houston, TX | ||
| Walter Orbin | orbin-000wal | 1900 | U. Pennsylvania | College | , | ||
| Al Orth | orth--001alb | 1900 | 4/19-10/10 | 39 g. | Philadelphia | National League | Philadelphia, PA |
| William Osborne | osborn007--- | 1900 | 8/2-8/5 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Champ Osteen | osteen001jam | 1900 | no g. | Statesville | North Carolina Association | Statesville, NC | |
| Champ Osteen | osteen001jam | 1900 | +6/21-7/17+ | Piedmont-GreenvSC | Independent | Piedmont, SC | |
| Orval Overall | overal001orv | 1900-03 | U. of CA-Berkeley | College | , | ||
| Orval Overall | overal001orv | 1900 | 8 g. | Visalia | San Joaquin | Visalia, CA | |
| Benjamin Owen | 1900 | Washburn College | College | , | |||
| Frank Owen | owen--001fra | 1900 | 5/3-6/9 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Frank Owen | owen--001fra | 1900 | 8/24-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Arthur Owens | owens-001art | 1900 | 7 g. | Danville Champions | Central League | Danville, IL | |
| Red Owens | owens-003tho | 1900 | 5/10-5/22 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Red Owens | owens-003tho | 1900 | +5/26-9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Andy Oyler | oyler-001and | 1900-01 | Wash. & Jeff. Col. | College | , | ||
| Ed Pabst | pabst-001ed- | 1900 | - 12/2 | 79 g. | San Francisco Brewers | California League | San Francisco, CA |
| Russ Pace | pace--001c-- | 1900 | 4/1- | 51 g. | Stockton Wasps | California League | Stockton, CA |
| Russ Pace | pace--001c-- | 1900 | Calciners | Independent | , | ||
| Russ Pace | pace--001c-- | 1900 | -9/23 | 20 g. | Anaconda Serpents | Montana State League | Anaconda, MT |
| Dick Padden | padden001ric | 1900 | 4/21-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Luis Padron | padron001lou | 1900 | Habana | Cuban League | , | ||
| George Page | page--003geo | 1900 | 66 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Pagh | pagh--001--- | 1900 | 6/5 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Pale | pale--001--- | 1900 | 5/11- | Schenectady Electricians | New York State League | Schenectady, NY | |
| William Palmer | palmer003wil | 1900 | Potsdam | Northern New York League | Potsdam, NY | ||
| William Palmer | palmer003wil | 1900 | Massena NY | Independent | Massens, NY | ||
| John Pappalau | pappal001joh | 1900 | 5/2-9/19 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Al Pardee | pardee001alb | 1900 | 4/30-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Freddy Parent | parent001fre | 1900 | 4/26-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Parker | 1900 | Genuine Cuban Giants | Independent | Genuine, | |||
| Parker | 1900 | +4/15+ | Cuban X Giants | Black Baseball League | Cuban, | ||
| Parker | parker084--- | 1900 | Raleigh Senators | North Carolina Association | Raleigh, NC | ||
| Harley Parker | parker001har | 1900 | 4/28-8/22 | Minneapolis Millers | American League | Minneapolis, MN | |
| Jay Parker | parker002jay | 1900 | 28 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| William Parker | parker010wil | 1900 | Cuban Giants | Black Baseball | , | ||
| Tom Parrott | parrot002tho | 1900 | 5/5-5/6 | Denver Grizzlies | Western League | Denver, CO | |
| Tom Parrott | parrot002tho | 1900 | 5/9-9/4 | Pueblo Indians | Western League | Pueblo, CO | |
| Partin | partin001--- | 1900 | +5/22+ | Muncie | Indiana State League | Muncie, IN | |
| Bones Parvin | parvin001fra | 1900 | 4/28-5/9 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Bones Parvin | parvin001fra | 1900 | 6/9-9/3 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Francisco Pastrana | pastra000fra | 1900 | Almendarista | Cuban League | , | ||
| Harry Pattee | pattee001har | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Casey Patten | patten001cas | 1900 | 4/19-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| John Patterson | patter007joh | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | ||
| Roy Patterson | patter001roy | 1900 | 4/23-9/16 | Chicago White Stockings | American League | Chicago, IL | |
| William Patterson | patter007wil | 1900 | 36 g. | Peoria Distillers | Central League | Peoria, IL | |
| Emile Pautot | pautot001e-- | 1900 | 4/30-6/2 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Emile Pautot | pautot001e-- | 1900 | 6/8-6/16 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Emile Pautot | pautot001e-- | 1900 | 6/18-7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Payne | payne-018--- | 1900 | 7 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Wood Payne | payne-008--- | 1900-05 | +5/5/03+ | TN Deaf & Dumb | School | , | |
| Charley Pease | pease-001cha | 1900 | WiSt? | , | |||
| William Peeples | peeple001wil | 1900 | 4/1- | 21 g. | San Francisco Brewers | California League | San Francisco, CA |
| William Peeples | peeple001wil | 1900 | - 9/23 | 62 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Heinie Peitz | peitz-001hen | 1900 | 4/19-10/14 | 91 g. | Cincinnati | National League | Cincinnati, OH |
| Bob Pender | pender001rob | 1900 | 5/11-6/22 | Albany Senators | New York State League | Albany, NY | |
| Bob Pender | pender001rob | 1900 | 6/29-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Pendergraft | 1900 | +7/4+ | SLC-Rio Grandes | Independent | , | ||
| John Penland | 1900-04 | Univ. of Oregon | College | , | |||
| G. Pennington | pennin000g-- | 1900 | Horner Mili School | School | , | ||
| G. Pennington | pennin000g-- | 1900 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | ||
| G. Pennington | pennin000g-- | 1900 | +8/1+ | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| A.R. Penny | penney001a-- | 1900 | 5/9-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Frank Pequinney | pequin001fra | 1900 | 4/28-8/12 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Bob Perham | perham002w-- | 1900 | - 9/22 | 34 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Bull Perrine | perrin001fre | 1900 | 3 g. | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Perry | perry-002--- | 1900 | 9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Clay Perry | perry-001cla | 1900-? | U. of Wisconsin | College | , | ||
| Eddie Persons | person001edw | 1900 | 5/16-6/7 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Eddie Persons | person001edw | 1900 | 6/25-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Dave Peterson | 1900-01 | +6/4+ | Ottawa Univ. | College | , | ||
| George Pfanmiller | pfanmi001geo | 1900 | 5/13-9/19 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Dan Pfenninger | pfenni001dan | 1900 | 5/9-6/7 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Dan Pfenninger | pfenni001dan | 1900 | Rockville CT | Independent | Rockville, CT | ||
| Dan Pfenninger | pfenni001dan | 1900 | 6/26-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Thomas Phelan | 1900 | Umpire | Atlantic League | , | |||
| Phelps | 1900 | 7 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Ed Phelps | phelps002edw | 1900 | 4/28-7/5 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Ed Phelps | phelps002edw | 1900 | 7/11-8/18 | Montreal Royals | Eastern League | Montreal, QC | |
| Ed Phelps | phelps002edw | 1900 | 8/23-9/22 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Thomas Philbin | philbi002tho | 1900 | 5/18-5/26 | New London Whalers | Connecticut State League | New London, CT | |
| Deacon Phillippe | philli001cha | 1900 | 4/22-10/12 | 38 g. | Pittsburgh | National League | Pittsburgh, PA |
| Bill Phillips | philli005wil | 1900 | 4/19-10/08 | 29 g. | Cincinnati | National League | Cincinnati, OH |
| Wiley Piatt | piatt-001wil | 1900 | 4/25-8/22 | 22 g. | Philadelphia | National League | Philadelphia, PA |
| Jack Pickard | pickar001jac | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Jack Pickard | pickar001jac | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Ollie Pickering | picker001oli | 1900 | 4/20-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Dave Pickett | picket003dav | 1900 | +5/18-6/21 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Charles Piepho | piepho001c-- | 1900 | Goss Bros | Louisville City League | Louisville, KY | ||
| Frank Pierson | 1900 | Chester | Independent | Chester, PA | |||
| Fred Pilcher | pilche001fre | 1900 | 5/22- | 45 g. | Helena Senators | Montana State League | Helena, MT |
| George Pingree | pingre001geo | 1900 | Dartmouth Col. | College | , | ||
| Pitt | pitt--002--- | 1900 | Sacramento Gilt Edges | California League | Sacramento, CA | ||
| Togie Pittinger | pittin001cha | 1900 | 4/26-6/15 | 18 g. | Boston | National League | Boston, MA |
| Togie Pittinger | pittin001cha | 1900 | 6/23-9/1 | Worcester Farmers | Eastern League | Worcester, MA | |
| Togie Pittinger | pittin001cha | 1900 | 9/5-10/04 | 18 g. | Boston | National League | Boston, MA |
| E. Pitts | pitts-002e-- | 1900 | 10 g. | Sacr.-A&C | Independent | Sacramento, CA | |
| Charles Placard | placar000cha | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Homer Plake | plake-001hom | 1900 | +6/3+ | Ogden | Independent | Ogden, UT | |
| Miguel Planas | planas000mig | 1900 | Cubano | Cuban League | , | ||
| Eddie Plank | plank-003edw | 1900 | Gettysburg | Independent | Gettysburg, PA | ||
| Eddie Plank | plank-003edw | 1900 | Gettysburg Col. | College | , | ||
| Forrest Plass | plass-001for | 1900 | 5/10-5/19 | Hamilton Hams | International League | Hamilton, ON | |
| Harry Platt | platt-002har | 1900 | San Francisco Brewers | California League | San Francisco, CA | ||
| Eddie Pleiss | pleiss001edw | 1900 | Ogdensburg | Northern New York League | Plattsburgh, NY | ||
| Eddie Pleiss | pleiss001edw | 1900 | Gouverneur | Northern New York League | Gouverneur, NY | ||
| Walter Plymat | plymat001--- | 1900 | U. Minn. Law | College | , | ||
| Walter Plymat | plymat001--- | 1900 | +7/20+ | Aberdeen | Independent | Aberdeen, SD | |
| Poarch | poarch001--- | 1900 | 6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Lou Polchow | polcho001lou | 1900 | +6/4+ | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Lou Polchow | polcho001lou | 1900 | 8/25-9/1 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Gee Poltzenholsten | poltze001gee | 1900 | 7/7 | Hampton Crabs | Virginia League | Hampton, VA | |
| Ed Poole | poole-001edw | 1900 | 4/28-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Ed Poole | poole-001edw | 1900 | 10/6-10/12 | 2 g. | Pittsburgh | National League | Pittsburgh, PA |
| Jap Poor | poor--001jas | 1900 | 101 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Jap Poor | poor--001jas | 1900 | Danville Champions | Central League | Danville, IL | ||
| Hoyt Poorman | poorma000hoy | 1900 | Salina | Independent | Salina, KS | ||
| Fred Popkay | popkay001fre | 1900 | Umpire | International League | , | ||
| Louis Popp | popp--001lou | 1900 | 39 g. | Danville Champions | Central League | Danville, IL | |
| Maurice Posner | posner001mau | 1900 | 6/7-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Potter/Cotter | potter002--- | 1900 | 5/22-5/24+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Frank Powe | powe--000fra | 1900 | +5/4-5/26+ | U. Alabama | College | , | |
| Frank Powe | powe--000fra | 1900 | +8/26+ | Livingston AL | Independent | Livingston, AL | |
| Abner Powell | powell001abn | 1900 | 6/?-7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Abner Powell | powell001abn | 1900 | 7/30-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Banks Powell | powell000ban | 1900 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | ||
| Jack Powell | powell007joh | 1900 | 4/22-10/09 | 38 g. | St. Louis | National League | St. Louis, MO |
| Jim Powell | powell002jim | 1900 | 5/22- | 6 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Doc Powers | powers002mic | 1900 | 4/21-9/14 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Francisco Poyo | poyo--000fra | 1900 | Cubano | Cuban League | , | ||
| Esteban Prats | prats-000est | 1900 | Cubano | Cuban League | , | ||
| Miguel Prats | prats-000mig | 1900 | Almendarista | Cuban League | , | ||
| George Prentiss | prenti002geo | 1900 | 5/15-6/28+ | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Preston | presto003--- | 1900 | 7 g. | Azusa | Southern California League | Azusa, CA | |
| Walt Preston | presto002wal | 1900 | 105 g. | Denver Grizzlies | Western League | Denver, CO | |
| Hugh Price | price-001hug | 1900 | 11 g. | Pueblo Indians | Western League | Pueblo, CO | |
| Teddy Price | 1900 | Salina | Independent | Salina, KS | |||
| E.L. Proctor | procto001e-- | 1900 | 9 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Arthur Prouse | prouse000art | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Charles Prouse | prowse001cha | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Billy Prout | prout-002wil | 1900 | +7/21+ | Norwood OH | Independent | Norwood, OH | |
| Billy Prout | prout-002wil | 1900 | +9/23+ | Covington KY | Independent | Covington, KY | |
| Raymond Pulse | pulse-001ray | 1900 | +4/28+ | Anderson HS | High School | , | |
| C.G. Pulsifer | pulsif000c-- | 1900 | 6/4-6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Nate Pulsifer | pulsif001nat | 1900 | 4/30-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Royce Purington | puring001roy | 1900 | Bates College | College | , | ||
| Gus Pyne | pyne--001gus | 1900 | 20 g. | Stockton Wasps | California League | Stockton, CA | |
| Gus Pyne | pyne--001gus | 1900 | Sacramento Gilt Edges | California League | Sacramento, CA | ||
| Gus Pyne | pyne--001gus | 1900 | Stockton Wasps | California League | Stockton, CA | ||
| Gus Pyne | pyne--001gus | 1900 | San Francisco Brewers | California League | San Francisco, CA | ||
| Queen | queen-001--- | 1900 | 6/5-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Eddie Quick | quick-001edw | 1900 | Baltimore Atlantics | Baltimore City League | Baltimore, MD | ||
| Eddie Quick | quick-001edw | 1900 | 6/28-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Arthur Quigley | quigle002art | 1900 | Potsdam | Northern New York League | Potsdam, NY | ||
| Frank Quigley | quigle001fra | 1900 | 5/5-5/13 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Frank Quigley | quigle001fra | 1900 | 24 g. | Decatur Commodores | Central League | Decatur, IL | |
| Larry Quinlan | quinla001law | 1900 | 5/18-7/30 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Larry Quinlan | quinla001law | 1900 | Chester | Independent | Chester, PA | ||
| Larry Quinlan | quinla001law | 1900 | 8/7-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Quinn | quinn-017--- | 1900 | 8/6 | Rome Romans | New York State League | Rome, NY | |
| Quinn | quinn-033--- | 1900 | 7/9 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Bobby Quinn | quinn-005rob | 1900 | 4/29-8/14 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Bobby Quinn | quinn-005rob | 1900 | 8/28-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Frank Quinn | quinn-006fra | 1900 | 5/1-7/15 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Harry Quinn | quinn-002har | 1900 | 5/5-6/8 | Anderson | Indiana State League | Anderson, IN | |
| Jack Quinn | quinn-004joh | 1900 | 5/11-6/17 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Joe Quinn | quinn-003jos | 1900 | 5/6-6/19 | 22 g. | St. Louis | National League | St. Louis, MO |
| Joe Quinn | quinn-003jos | 1900 | 6/23-9/19 | 74 g. | Cincinnati | National League | Cincinnati, OH |
| Moises Quintero | quinte000moi | 1900 | Almendarista | Cuban League | , | ||
| Fred Quitman | quitma001fra | 1900 | +4/22+ | Chicago Auburn Parks | Independent | Chicago, IL | |
| Fred Quitman | quitma001fra | 1900 | +6/23+ | Chicago Palmers | Independent | Chicago, IL | |
| S. Rabbitt | rabbit001s-- | 1900 | 5/8-5/21 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Teddy Radcliffe | radcli001c-- | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Teddy Radcliffe | radcli001c-- | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| William Radcliffe | radcli001wil | 1900 | 5/16-5/29 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| William Radcliffe | radcli001wil | 1900 | Chester | Independent | Chester, PA | ||
| William Radcliffe | radcli001wil | 1900 | 7/3-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Jack Rafter | rafter001joh | 1900 | Albany Senators | New York State League | Albany, NY | ||
| Joe Raidy | raidy-001jos | 1900 | 8/10-9/7 | Worcester Farmers | Eastern League | Worcester, MA | |
| John Ramey | ramey-002joh | 1900 | 5/5-5/12 | Pueblo Indians | Western League | Pueblo, CO | |
| Hank Ramsey | ramsey001hen | 1900 | 5/11-5/? | Troy Washerwomen | New York State League | Troy, NY | |
| Charles Rapp | rapp--001cha | 1900 | +8/14+ | South Bend | Independent | South Bend, IN | |
| Louis Rapp | rapp--001lou | 1900 | 5/7-7/10+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Rathbun | rathbu001--- | 1900 | +7/29+ | Grand Rapids | Independent | Grand Rapids, MI | |
| Tommy Raub | raub--001tho | 1900 | 5/12-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| Harley Rawson | rawson001har | 1900 | , | ||||
| John Ray | ray---006joh | 1900 | 5/5-6/8 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| John Ray | ray---006joh | 1900 | 6/- | Umpire | Central League | , | |
| Fred Raymer | raymer001fre | 1900 | 4/29 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Fred Raymer | raymer001fre | 1900 | 5/5-5/30 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Fred Raymer | raymer001fre | 1900 | 57 g. | Pueblo Indians | Western League | Pueblo, CO | |
| Fred Raymer | raymer001fre | 1900 | Rock Rapids | Independent | Rock Rapids, IA | ||
| Fred Raymer | raymer001fre | 1900 | Pueblo Indians | Western League | Pueblo, CO | ||
| Fred Raymer | raymer001fre | 1900 | -9/23 | 10 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Montie Rea | rea---000mon | 1900 | 7/6-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Reagan/Regan | reagan015--- | 1900 | Manchester NH? | Independent | Manchester, NH | ||
| Reagan/Regan | reagan015--- | 1900 | 7/30 | Albany Senators | New York State League | Albany, NY | |
| George Ream | ream--001geo | 1900 | 5/17-9/1 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Denny Reardon | reardo001d-- | 1900 | 5/11-7/20 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Denny Reardon | reardo001d-- | 1900 | 8/14-8/18 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| John Rebsamen | rebsam001joh | 1900 | 107 g. | Omaha Omahogs | Western League | Omaha, NE | |
| John Rebsamen | rebsam001joh | 1900 | Des Moines Hawkeyes | Western League | Des Moines, IA | ||
| John Rebsamen | rebsam001joh | 1900 | Rock Island | Rock Island, IL | |||
| George Reed | reed--003geo | 1900 | 60 g. | Bloomington Blues | Central League | Bloomington, IL | |
| George Reese | reese-002geo | 1900 | , | ||||
| George Regan | regan-001geo | 1900 | , | ||||
| Joe Regan | regan-001joe | 1900 | 5/10-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Bill Reid | reid--002wil | 1900 | 5/10-7/2 | London Tecumsehs | International League | London, ON | |
| Bill Reid | reid--002wil | 1900 | 7/10-8/4 | London Tecumsehs | International League | London, ON | |
| Richmond Reid | reid--002ric | 1900 | Concord | Independent | Concord, NC | ||
| Bill Reidy | reidy-001wil | 1900 | 4/28-9/16 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Reilly | reilly012--- | 1900 | 6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Charlie Reilly | reilly003cha | 1900 | 68 g. | Denver Grizzlies | Western League | Denver, CO | |
| Josh Reilly | reilly002wil | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Tom Reilly | reilly004tho | 1900 | Meriden Silverites | Connecticut State League | Meriden, CT | ||
| Reinacher | reinac001--- | 1900 | 4/26-5/8 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Reinacher | reinac001--- | 1900 | Harlem-Equitables | Independent | Harlem, NY | ||
| Reinacher | reinac001--- | 1900 | West NY Field Club | Independent | West, NY | ||
| Doc Reisling | reisli001fra | 1900 | +6/26-9/6 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| George Reitz | reitz-001geo | 1900 | Sioux Falls | Independent | Sioux Falls, SD | ||
| George Reitz | reitz-001geo | 1900 | 6/2-6/8 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| George Reitz | reitz-001geo | 1900 | 6/13- | 5 g. | Pueblo Indians | Western League | Pueblo, CO |
| George Reitz | reitz-001geo | 1900 | Marquette SD | Independent | Marquette, SD | ||
| Henry Reitz | reitz-001hen | 1900 | 4/22-5/23 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Henry Reitz | reitz-001hen | 1900 | 8 g. | San Francisco Brewers | California League | San Francisco, CA | |
| George Rettger | rettge002geo | 1900 | 4/26-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Sam Reust | reust-001sam | 1900 | 39 g. | Decatur Commodores | Central League | Decatur, IL | |
| Sam Reust | reust-001sam | 1900 | 9/5-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Reynolds | reynol002--- | 1900 | Utica Reds | New York State League | Utica, NY | ||
| Hal Reynolds | reynol002h-- | 1900 | Iowa State U. | College | , | ||
| Jesse Reynolds | reynol001jes | 1900 | Richmond IN | Independent | Richmond, IN | ||
| Billy Rhines | rhines001wil | 1900 | , | ||||
| Rice | rice--017--- | 1900 | Kokomo | Indiana State League | Kokomo, IN | ||
| Billy Rice | rice--002w-- | 1900 | 1 g. | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Charles Rice | rice--001cha | 1900 | no g. | Minneapolis Millers | American League | Minneapolis, MN | |
| Laurence Rice | rice--001law | 1900 | Elmi-FatherMathew | Independent | Elmira, NY | ||
| Laurence Rice | rice--001law | 1900 | Mercerberg Acad. | High School | , | ||
| Bill Richardson | richar006wil | 1900 | 4/30-5/5 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Bill Richardson | richar006wil | 1900 | 5/11-5/22 | Hampton Crabs | Virginia League | Hampton, VA | |
| George Richardson | richar001geo | 1900 | Chicago Unions | Black Baseball | Chicago, IL | ||
| S. W. Richardson | 1900 | Hamline Univ. | College | , | |||
| S. W. Richardson | 1900 | Aberdeen | Independent | Aberdeen, SD | |||
| Richmond | richmo003--- | 1900 | 6/16-6/25 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| John Richter | richte001joh | 1900 | 4/27-5/8 | Montreal Royals | Eastern League | Montreal, QC | |
| John Richter | richte001joh | 1900 | 5/11-5/17 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| John Richter | richte001joh | 1900 | 5/23-6/15 | Worcester Farmers | Eastern League | Worcester, MA | |
| John Richter | richte001joh | 1900 | 6/22-6/25 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| John Richter | richte001joh | 1900 | 7/4-7/26 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Joe Rickert | ricker001jos | 1900 | 4/26-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Rieman | rieman002--- | 1900 | 7/15 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| George Rieman | rieman001geo | 1900 | 5/12-9/3 | Troy Washerwomen | New York State League | Troy, NY | |
| Joseph Rieman | rieman001jos | 1900 | 4/28-5/30 | Dayton Veterans | Interstate League | Dayton, OH | |
| Joseph Rieman | rieman001jos | 1900 | 6/4-8/4 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Joseph Rieman | rieman001jos | 1900 | 8/5 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Joseph Rieman | rieman001jos | 1900 | 8/16-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Riker | riker-001--- | 1900 | 5/20 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Riley | riley-006--- | 1900 | 5/20 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Charles Riley | riley-001cha | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Daniel Riley | riley-002dan | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| James Riley | riley-006jam | 1900 | 5/13 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Frank Rinn | rinn--002fra | 1900 | Lancaster Actives | Independent | Lancaster, PA | ||
| Frank Rinn | rinn--002fra | 1900 | 7/2-9/22 | Umpire | Eastern League | , | |
| Claude Ritchey | ritche001cla | 1900 | 123 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Ritchie | ritchi008--- | 1900 | 4 g. | Helena Senators | Montana State League | Helena, MT | |
| Ritchie | ritchi008--- | 1900 | 2 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Lew Ritter | ritter002lew | 1900 | 4/28-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Rivers | 1900 | 6/25-7/23 | Raleigh Senators | North Carolina Association | Raleigh, NC | ||
| John Roach | roach-003joh | 1900 | 4/30-6/9 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| John Roach | roach-003joh | 1900 | 7/5 | Montreal Royals | Eastern League | Montreal, QC | |
| John Roach | roach-003j-- | 1900 | 19 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| John Roach | roach-003j-- | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| John Roach | roach-003j-- | 1900 | 6 g. | Sedalia | Independent | Sedalia, MO | |
| Mike Roach | roach-001mik | 1900 | 4/28-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Skel Roach | roach-001rud | 1900 | 24 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Skel Roach | roach-001rud | 1900 | Omaha Omahogs | Western League | Omaha, NE | ||
| Clay Robb | robb--001cla | 1900 | 5/12-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Vince Robbins | robbin001vin | 1900 | 7/2 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Robertson | robert111--- | 1900 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | ||
| Edward Robertson | robert007edw | 1900 | Cornell University | College | , | ||
| Frank Robertson | robert005fra | 1900-02 | Yale Univ | College | , | ||
| Frank Robertson | robert005fra | 1900 | Messena NY | Independent | Messena, NY | ||
| Frank Robertson | robert005fra | 1900 | 8/21 | Ogdensburg | Northern New York League | Ogdensburg, NY | |
| Fred Robertson | 1900 | Yale Univ. | College | , | |||
| Fred Robertson | 1900 | Paul Smith’s | Independent | , | |||
| J. Robinson | robins010j-- | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| James Robinson | robins017jam | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| James Robinson | robins017jam | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| James? Robinson | 1900 | 8/20-9/3 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Rabbit Robinson | robins003wil | 1900 | 5/10-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Rabbit Robinson | robins003wil | 1900 | 8/24-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Wilbert Robinson | robins001wil | 1900 | 5/12-10/5 | 60 g. | St. Louis | National League | St. Louis, MO |
| J.D. Roche | roche-000jd- | 1900 | 5/11-9/8 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| George Rochelle | 1900 | no g. | Norfolk Phenoms | Virginia League | Norfolk, VA | ||
| Gus Rochelle | rochel001gus | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Carl Rock | rock--001car | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| Fred Roderick | roderi001f-- | 1900 | 5/11 | New London Whalers | Connecticut State League | New London, CT | |
| Fred Roderick | roderi001f-- | 1900 | Winsted-TAB | Independent | Winsted, CT | ||
| Rodman | rodman001--- | 1900 | 6/25 | Pueblo Indians | Western League | Pueblo, CO | |
| Rodner | rodner001--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Felo Rodriguez | rodrig011fel | 1900 | Cubano | Cuban League | , | ||
| Joe Roe | roe---001jos | 1900 | Sedalia | Independent | Sedalia, MO | ||
| Rogers | 1900 | Genuine Cuban Giants | Independent | Genuine, | |||
| Terry Rogers | rogers001ter | 1900 | 5/10-9/8 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Rohan | rohan-002--- | 1900 | 6/11 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| George Rohe | rohe--001geo | 1900 | 22 g. | Danville Champions | Central League | Danville, IL | |
| Roland | 1900 | 1 g. | Visalia | San Joaquin | Visalia, CA | ||
| Ferdinand Rollander | rollan001--- | 1900-07 | Manilla/Presidio | Army | , | ||
| Pat Rollins | rollin001hen | 1900 | 90 g. | Bloomington Blues | Central League | Bloomington, IL | |
| Jose Romero | romero006jos | 1900 | Habana | Cuban League | , | ||
| M. Romey | 1900 | Denver Grizzlies | Western League | Denver, CO | |||
| Salvador Rosado | rosado000sal | 1900 | San Francisco | Cuban League | , | ||
| Rosie Rosebraugh | rosebr001ros | 1900 | 4/29-5/30 | Dayton Veterans | Interstate League | Dayton, OH | |
| Rosie Rosebraugh | rosebr001ros | 1900 | 6/9-8/3 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Rosie Rosebraugh | rosebr001ros | 1900 | 8/10-9/15 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| A. Rosenbach | rosenb001a-- | 1900 | 5/7-6/11 | Elmira | Atlantic League | Elmira, NY | |
| Art Ross | ross--001art | 1900 | 5/11-9/8 | Rome Romans | New York State League | Rome, NY | |
| Art Ross | ross--001art | 1900 | 9/9-9/19 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Andy Roth | roth--001and | 1900 | 5/11-7/11 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Frank Roth | roth--001fra | 1900 | 5/10-7/31 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Frank Roth | roth--001fra | 1900 | +8/14+ | Muskegon Reds | Independent | Muskegon, MI | |
| Bobby Rothermel | rother001bob | 1900 | 4/28-8/15 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Bobby Rothermel | rother001bob | 1900 | no g. | Bloomington | Three I League | Bloomington, IL | |
| C. Rothermel | rother001c-- | 1900 | 5/10-5/24 | Norwich Witches | Connecticut State League | Norwich, CT | |
| C. Rothermel | rother001c-- | 1900 | Pottsville PA | Independent | Pottsville, PA | ||
| Wilson Rothermel | rother002wil | 1900 | Dickinson Col. | College | , | ||
| Adam Rothfuss | rothfu001ada | 1900 | 5/11-9/8 | Troy Washerwomen | New York State League | Troy, NY | |
| Jack Rothfuss | rothfu001jac | 1900 | 4/30-7/10 | Toronto Canucks | Eastern League | Toronto, ON | |
| Jack Rothfuss | rothfu001jac | 1900 | Albany Senators | New York State League | Albany, NY | ||
| Jack Rothfuss | rothfu001jac | 1900 | 8/21-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Billy Rourke | rourke001wil | 1900 | 5/5-9/4 | Omaha Omahogs | Western League | Omaha, NE | |
| Elmer Roussey | rousse002elm | 1900 | Baltimore Atlantics | Baltimore City League | Baltimore, MD | ||
| Routson | routso001--- | 1900 | 7/2 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Carlos Royer | royer-000car | 1900 | Cubano | Cuban League | , | ||
| James Royster | royste000jam | 1900 | 5/1+ | Wake Forest U. | College | , | |
| James Royster | royste000jam | 1900 | 6/25-7/3+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Frank Rudderham | rudder001fra | 1900 | +5/13-9/8 | Rome Romans | New York State League | Rome, NY | |
| Fred Ruehr | ruehr-001--- | 1900 | 5/7-5/31 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Ruhlin/Ruhland | ruhlan001--- | 1900 | 6/21-7/11 | Hampton Crabs | Virginia League | Hampton, VA | |
| Lee Rundell | rundel001g-- | 1900 | Intn & GN RR | Independent | , | ||
| Louis Runkel | runkle001lou | 1900 | Lebanon PA | Lebanon, PA | |||
| Amos Rusie | rusie-001amo | 1900 | Umpire | Muncie City League | , | ||
| William Russ | russ--002wil | 1900 | 5/15 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Clyde Russell | russel001cly | 1900 | +5/11-6/8 | Anderson | Indiana State League | Anderson, IN | |
| Clyde Russell | russel001cly | 1900 | no g. | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Cy Russell | russel002fra | 1900 | 3 g. | Bakersfield | San Joaquin | Bakersfield, CA | |
| Paul Russell | russel002pau | 1900 | 5/8-5/10 | Scranton Miners | Atlantic League | Scranton, PA | |
| Ralph Russell | 1900 | U. of Michigan | College | , | |||
| Ralph Russell | 1900 | Jamestown NY | Independent | Jamestown, NY | |||
| Robert Russell | russel006rob | 1900 | Potsdam | Northern New York League | Potsdam, NY | ||
| Ryan | ryan--002--- | 1900 | Syra.-Shamrocks | Independent | Syracuse, NY | ||
| Ryan | ryan--002--- | 1900 | 9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Ryan | ryan--021--- | 1900 | +5/26- | Rome Romans | New York State League | Rome, NY | |
| Cyclone Ryan | ryan--001cyc | 1900 | +5/21-7/11 | Umpire | New York State League | , | |
| Cyclone Ryan | ryan--001cyc | 1900 | Ilion | Independent | Ilion, NY | ||
| Denny Ryan | ryan--001den | 1900 | 5/18-6/6 | New London Whalers | Connecticut State League | New London, CT | |
| Denny Ryan | ryan--001den | 1900 | Dubois | Independent | Dubois, PA | ||
| Jack Ryan | ryan--004joh | 1900 | 4/19-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Jimmy Ryan | ryan--003jam | 1900 | 4/19-9/18 | 105 g. | Chicago | National League | Chicago, IL |
| Paddy Ryan | ryan--001pat | 1900 | 33 g. | Helena Senators | Montana State League | Helena, MT | |
| F. Sackett | sacket001f-- | 1900 | 8/5-9/3 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| F. Sackett | sacket001f-- | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| Harry Sage | sage--001har | 1900 | Umpire | Western League | , | ||
| Solly Salisbury | salisb001wil | 1900 | 4/1- | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Solly Salisbury | salisb001wil | 1900 | 6 g. | Stockton Wasps | California League | Stockton, CA | |
| Solly Salisbury | salisb001wil | 1900 | -9/22 | 34 g. | Helena Senators | Montana State League | Helena, MT |
| Guy Sample | sample001guy | 1900 | 4/29-5/13 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Guy Sample | sample001guy | 1900 | 53 g. | Bloomington Blues | Central League | Bloomington, IL | |
| John Sanders | sander001sho | 1900 | 5/10-6/26 | Chatham Reds | International League | Chatham, ON | |
| War Sanders | sander001war | 1900 | 5/12-5/15 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| War Sanders | sander001war | 1900 | 9 g. | Decatur Commodores | Central League | Decatur, IL | |
| Sanford | sanfor001--- | 1900 | 4/30-5/15 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Chuck Santary | 1900 | Pittsburg | Pittsburg, KS | ||||
| William Sarsfield | sarsfi002--- | 1900 | Syracuse Univ. | College | , | ||
| William Sarsfield | sarsfi002--- | 1900 | 8/22-9/8 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| James Sayer | sayer-001jam | 1900 | 4/30-5/18 | Elmira | Atlantic League | Elmira, NY | |
| Del Sayers | sayers001del | 1900 | +5/30+ | Ohio State U. | College | , | |
| Del Sayers | sayers001del | 1900 | 6/23 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Del Sayers | sayers001del | 1900 | no g. | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Jack Scannell | scanne001joh | 1900 | 5/10-9/8 | Derby Angels | Connecticut State League | Derby, CT | |
| Germany Schaefer | schaef001her | 1900 | 4/19-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Fred Schaetzke | 1900 | 5/13-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | ||
| Fred Schatzke | schatz001fre | 1900 | 47 g. | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Bob Schaub | schaub001rob | 1900 | 4/28-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Ted Scheffler | scheff001ted | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Ted Scheffler | scheff001ted | 1900 | 6/27-9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Frank Scheibeck | scheib001fra | 1900 | 4/26-9/21 | Montreal Royals | Eastern League | Montreal, QC | |
| Herman Schencil | 1900 | Chester | Independent | Chester, PA | |||
| Bert Schils | schils001alb | 1900 | 4/28-5/9 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Bert Schils | schils001alb | 1900 | 5/22-9/23 | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Larry Schlafly | schlaf001har | 1900 | -10/14 | Canton | Independent | Canton, OH | |
| Schlagel | schlag001--- | 1900 | 8/26 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Frank Schlorf | schlor001fra | 1900 | +5/15- | Anderson | Indiana State League | Anderson, IN | |
| Frank Schlorf | schlor001fra | 1900 | 4 g. | Helena Senators | Montana State League | Helena, MT | |
| Claude Schmeer | schmee001cla | 1900 | 4/1- | 24 g. | Oakland Oaks | California League | Oakland, CA |
| Claude Schmeer | schmee001cla | 1900 | 36 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Henry Schmidt | schmid004hen | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Henry Schmidt | schmid004hen | 1900 | 24 g. | Denver Grizzlies | Western League | Denver, CO | |
| Crazy Schmit | schmit001fre | 1900 | 4/29-5/12 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Crazy Schmit | schmit001fre | 1900 | +5/26- | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Eddie Schnable | schnab001edd | 1900 | 5/22 | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Fred Schock | schock001fre | 1900 | U. of Washington | College | , | ||
| Fred Schock | schock001fre | 1900 | Everett WA | Independent | Everett, WA | ||
| Sox Schofield | schofi001sox | 1900 | 6 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Sox Schofield | schofi001sox | 1900 | 2 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Sox Schofield | schofi001sox | 1900 | Los Angeles-Pacific | Southern California League | Los Angeles, CA | ||
| Joe Schrall | schral001jos | 1900 | 4/19-4/26 | Minneapolis Millers | American League | Minneapolis, MN | |
| Joe Schrall | schral001jos | 1900 | 108 g. | St. Joseph Saints | Western League | St. Joseph, MO | |
| Ossee Schrecongost | schrec001oss | 1900 | 4/28-9/18 | Buffalo Bisons | American League | Buffalo, NY | |
| Pop Schriver | schriv001wil | 1900 | 4/25-10/13 | 37 g. | Pittsburgh | National League | Pittsburgh, PA |
| Schuch | schuch001--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Jack Schuster | schust001--- | 1900 | 5/22- | 9 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Jack Schuster | schust001--- | 1900 | 5 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Schwab | schwab001--- | 1900 | 4/28 | Dayton Veterans | Interstate League | Dayton, OH | |
| Charles Schwartz | schwar001cha | 1900 | San Francisco Brewers | California League | San Francisco, CA | ||
| Charles Schwartz | schwar001cha | 1900 | 4/1-12/2 | San Francisco Brewers | California League | San Francisco, CA | |
| Waldemar Schweyer | schwey000wal | 1900 | Almendarista | Cuban League | , | ||
| Ed Scott | scott-001edw | 1900 | 4/19-10/14 | 42 g. | Cincinnati | National League | Cincinnati, OH |
| Joseph Scott | scott-004jos | 1900 | Kankakee IL | Independent | Kankakee, IL | ||
| Ray Scott | scott-003ray | 1900 | 5/6-5/8 | Pueblo Indians | Western League | Pueblo, CO | |
| Joseph Scully | scully001jos | 1900 | 2 g. | Omaha Omahogs | Western League | Omaha, NE | |
| Jimmy Seagraves | seagra001cha | 1900 | 6/4- | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Jimmy Seagraves | seagra001cha | 1900 | -6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Jimmy Seagraves | seagra001cha | 1900 | Allentown Keystones | Independent | Allentown, PA | ||
| William Searles | searle001wil | 1900 | 16 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| William Searles | searle001wil | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Sears | sears-001--- | 1900 | 1 g. | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Sears | sears-001--- | 1900 | 2 g. | Butte Smoke Eaters | Montana State League | Grand Forks, ND | |
| Sears | sears-001--- | 1900 | Great Falls Indians | Montana State League | Great Falls, MT | ||
| Frank Sears | sears-001fra | 1900 | 6/26-8/30 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Jimmy Sebring | sebrin001jam | 1900 | Wmpt. store | Independent | , | ||
| Doc Sechrist | sechri001doc | 1900 | 5/1-5/8 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Doc Sechrist | sechri001doc | 1900 | 5/15-9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| E. Seiner | 1900 | no g. | Detroit Tigers | American League | Detroit, MI | ||
| Davy Seisler | seisle001dav | 1900 | 78 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Kip Selbach | selbac001alb | 1900 | 4/19-10/13 | 141 g. | New York | National League | New York, NY |
| William Selden | seldon001wil | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Frank Selee | selee-001fra | 1900 | Boston | National League | Boston, MA | ||
| Sellers | seller004--- | 1900 | 7/11-9/5 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Charles Selna | selna-001cha | 1900 | 4/1- | 5 g. | Stockton Wasps | California League | Stockton, CA |
| Charles Selna | selna-001cha | 1900 | 1 g. | Bakersfield | San Joaquin | Bakersfield, CA | |
| Paul Sentell | sentel001leo | 1900 | Morgan City LA | Independent | Morgan City, LA | ||
| Perry Sessions | sessio001per | 1900 | St. Cloud MN? | Independent | St. Cloud, MN | ||
| Perry Sessions | sessio001per | 1900 | Racine WI | Independent | Racine, WI | ||
| William Setley | setley001wil | 1900 | 5/22-5/24 | Great Falls Indians | Montana State League | Great Falls, MT | |
| Settles | settle002--- | 1900 | 4 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Socks Seybold | seybol001ral | 1900 | 4/20-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Cy Seymour | seymou001jam | 1900 | 4/20-6/7 | 23 g. | New York | National League | New York, NY |
| Cy Seymour | seymou001jam | 1900 | 6/18-6/24 | Chicago White Stockings | American League | Chicago, IL | |
| Cy Seymour | seymou001jam | 1900 | 9/10-9/27 | 23 g. | New York | National League | New York, NY |
| Joe Shackleton | shackl001jos | 1900 | 5/7-5/15 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Charlie Shaffer | shaffe001cha | 1900 | , | ||||
| Tim Shanahan | shanah001tim | 1900 | 4/1- | 39 g. | Sacramento Gilt Edges | California League | Sacramento, CA |
| Dan Shannon | shanno004dan | 1900 | 4/19-9/ | Buffalo Bisons | American League | Buffalo, NY | |
| Frank Shannon | shanno002fra | 1900 | 4/28-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Spike Shannon | shanno003wil | 1900 | Grove City Col. | College | , | ||
| Spike Shannon | shanno003wil | 1900 | 4/28-5/7 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Spike Shannon | shanno003wil | 1900 | 5/10- | Jersey City City | Atlantic League | Jersey City, NJ | |
| Spike Shannon | shanno003wil | 1900 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | ||
| Spike Shannon | shanno003wil | 1900 | -6/9 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Spike Shannon | shanno003wil | 1900 | 6/11-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Bud Sharpe | sharpe001bay | 1900-03 | Penn State U. | College | , | ||
| Jack Sharrott | sharro001jac | 1900 | 4/26-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Bill Sharsig | sharsi001bil | 1900 | 4/30-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Al Shaw | shaw--001alf | 1900 | 4/19-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Clifton Shaw | shaw--002cli | 1900 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | ||
| Danny Shay | shay--001dan | 1900 | 4/28-7/16 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Danny Shay | shay--001dan | 1900 | 7/22-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Danny Shea | shea--001dan | 1900 | Gridley | Northern California League | Gridley, CA | ||
| Gerry Shea | shea--001ger | 1900-05 | Creighton | College | , | ||
| Jim Shea | 1900 | Elmi.-FatherMathew | Independent | Elmira, NY | |||
| Nap Shea | shea--001joh | 1900 | 5/11-9/8 | Rome Romans | New York State League | Rome, NY | |
| John Shearon | shearo002joh | 1900 | 4/19-8/10 | Buffalo Bisons | American League | Buffalo, NY | |
| John Shearon | shearo002joh | 1900 | 8/16-9/14 | Chicago White Stockings | American League | Chicago, IL | |
| Jimmy Sheckard | shecka001sam | 1900 | 4/19-10/13 | 85 g. | Brooklyn | National League | Brooklyn, NY |
| Dan Sheehan | sheeha001dan | 1900 | 5/10-7/2 | Hamilton Hams | International League | Hamilton, ON | |
| Dan Sheehan | sheeha001dan | 1900 | 7/10-8/4 | Hamilton Hams | International League | Hamilton, ON | |
| Dan Sheehan | sheeha001dan | 1900 | 8/30-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Jack Sheehan | sheeha005joh | 1900 | 5/12-7/4 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Jack Sheehan | sheeha005joh | 1900 | Ilion | Independent | Ilion, NY | ||
| Tommy Sheehan | sheeha003tho | 1900 | 4/26-7/19 | Worcester Farmers | Eastern League | Worcester, MA | |
| Tommy Sheehan | sheeha003tho | 1900 | Meriden Silverites | Connecticut State League | Meriden, CT | ||
| Tommy Sheehan | sheeha003tho | 1900 | 8/2 | 1 g. | New York | National League | New York, NY |
| Tommy Sheehan | sheeha003tho | 1900 | -12/2 | 25 g. | Sacramento Gilt Edges | California League | Sacramento, CA |
| George Shelafo | shelaf001--- | 1900 | +7/30+ | Flandreau | Independent | Flandreau, SD | |
| Ben Shelton | shelto001ben | 1900 | -9/22 | 35 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Shepherd | shephe001--- | 1900 | +5/6 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Shepherd | shephe001--- | 1900 | +5/9-6/3+ | Muncie | Indiana State League | Muncie, IN | |
| Jack Sheridan | sherid001jac | 1900 | 4/19-9/18 | Umpire | Amateur | , | |
| John Sherman | sherma001joh | 1900 | +7/16-7/23+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| John Sherman | sherma001joh | 1900 | Statesville | North Carolina Association | Statesville, NC | ||
| Sherser | sherse001--- | 1900 | 5/3 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Bill Shettsline | shetts001bil | 1900 | Philadelphia | National League | Philadelphia, PA | ||
| Herman Shincel | shince001her | 1900 | 4/30-5/31 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Billy Shindle | shindl001wil | 1900 | 4/26-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Tim Shinnick | shinni002tim | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| Shinskey | shinsk001--- | 1900 | 6/9 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Fred Shires | shires001fre | 1900 | 4/28-5/30 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Lynn Shirk | shirk-001lyn | 1900 | preseason | Denver Grizzlies | Western League | Denver, CO | |
| George Shoch | shoch-001geo | 1900 | 4/30-5/31 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| George Shoch | shoch-001geo | 1900 | 6/18-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Ed Shortell | shorte001edw | 1900 | 4/30-5/3 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Frank Shugart | shugar001fra | 1900 | 4/21-9/16 | Chicago White Stockings | American League | Chicago, IL | |
| Johnny Siegle | siegle001joh | 1900 | 5/23-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Ed Siever | siever001edw | 1900 | 5/14-5/30 | London Tecumsehs | International League | London, ON | |
| Ed Siever | siever001edw | 1900 | 6/9-7/2 | Detroit Tigers | American League | Detroit, MI | |
| Ed Siever | siever001edw | 1900 | 8/12-9/18 | Detroit Tigers | American League | Detroit, MI | |
| Silva | silva-001--- | 1900 | 3 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Adolfo Silva | silva-000ado | 1900 | Cubano | Cuban League | , | ||
| Patrocinio Silverio | silver000pat | 1900 | San Francisco | Cuban League | , | ||
| Sleepy Simmons | simmon001sle | 1900 | 5/28-6/18 | Denver Grizzlies | Western League | Denver, CO | |
| Hank Simon | simon-001hen | 1900 | 5/11-9/8 | Utica Reds | New York State League | Utica, NY | |
| C. Simons | simons001c-- | 1900 | 4 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| D. Simons | simons001d-- | 1900 | 3 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Jack Simons | simons001joh | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Jack Simons | simons001joh | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| R. Simons | simons001r-- | 1900 | 3 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Ben Simonton | simont001ben | 1900 | 5/4-6/8 | New Castle Quakers | Interstate League | New Castle, PA | |
| Simpson | 1900 | 14 g. | Hanford | San Joaquin | Hanford, CA | ||
| Carl Sitton | sitton001car | 1900-04 | +3/26/04+ | Clemson Univ. | College | , | |
| John Skopec | skopec001joh | 1900 | 4/29-9/12 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Slagle | slagle003--- | 1900 | +5/15- | Schenectady Electricians | New York State League | Schenectady, NY | |
| Slagle | slagle003--- | 1900 | Cortland Wagonmakers | New York State League | Cortland, NY | ||
| Jimmy Slagle | slagle001jam | 1900 | 4/19-10/13 | 141 g. | Philadelphia | National League | Philadelphia, PA |
| Walt Slagle | slagle001wal | 1900 | +5/14-5/21+ | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Walt Slagle | slagle001wal | 1900 | Ashtabula | Independent | Ashtabula, OH | ||
| Ed Slater | slater001hen | 1900 | no g. | Detroit Tigers | American League | Detroit, MI | |
| Jack Slattery | slatte001joh | 1900 | Fordham Col. | College | , | ||
| Jack Slattery | slatte001joh | 1900 | 7/30-8/3 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Slein | slein-001--- | 1900 | +5/21- | Albany Senators | New York State League | Albany, NY | |
| Slujp | slujp-001--- | 1900 | +5/15- | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Smiley | smiley003--- | 1900 | 7 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Bill Smink | smink-001wil | 1900 | 4/26-6/23 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Bill Smink | smink-001wil | 1900 | 7/1-9/8 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Smith | smith-232--- | 1900 | 6/5-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Smith | smith-011--- | 1900 | 6/10 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Smith | smith-109--- | 1900 | -6/11 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Smith | smith-012--- | 1900 | 9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Aleck Smith | smith-001ale | 1900 | 4/26-5/5 | 7 g. | Brooklyn | National League | Brooklyn, NY |
| Big Bill Smith | smith-000big | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Big Bill Smith | smith-000big | 1900 | Genuine Cuban Giants | Independent | Genuine, | ||
| Billy Smith | smith-011wil | 1900 | 5/11-6/28 | Albany Senators | New York State League | Albany, NY | |
| Billy Smith | smith-057wil | 1900 | 4/28-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Bull Smith | smith-001lew | 1900-03 | U. West Virginia | College | , | ||
| C.E. Smith | smith-009c-- | 1900 | 5/15-5/21+ | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Clarence Smith | smith-003cha | 1900 | 5/1-6/12 | New Castle Quakers | Interstate League | New Castle, PA | |
| Clarence Smith | smith-003cha | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Cornelius Smith | smith-006cor | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Dick Smith | smith-022ric | 1900 | 4/29-9/12 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Ed Smith | smith-001rhe | 1900 | 5/5-6/8 | Kokomo | Indiana State League | Kokomo, IN | |
| Eddie Smith | smith-003edd | 1900 | 2 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Elmer Smith | smith-004elm | 1900 | 4/19-5/30 | 29 g. | Cincinnati | National League | Cincinnati, OH |
| Elmer Smith | smith-004elm | 1900 | 6/9-10/4 | 85 g. | New York | National League | New York, NY |
| Elmer Smith | smith-010elm | 1900 | Titusville PA | Independent | Titusville, PA | ||
| Frank Smith | smith-008fra | 1900 | Erie | Independent | Erie, PA | ||
| Frank Smith | smith-020fra | 1900 | 5/11-6/6 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| George Smith | smith-012geo | 1900 | 4/26-9/10 | Rochester Bronchos | Eastern League | Rochester, NY | |
| George Smith | smith-024geo | 1900 | 4/30-5/17 | Elmira | Atlantic League | Elmira, NY | |
| Germany Smith | smith-013geo | 1900 | 4/19-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Harry Smith | smith-018har | 1900 | 4/21-9/15 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Hugh Smith | smith-004hug | 1900 | Umpire | California League | , | ||
| James Smith | smith-048jam | 1900 | +5/24-6/9 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Joe Smith | smith-007jos | 1900 | Pottsville PA | Independent | Pottsville, PA | ||
| Joe Smith | smith-007jos | 1900 | Pottsville PA | Independent | Pottsville, PA | ||
| Jud Smith | smith-001jud | 1900 | 4/28-5/11 | Worcester Farmers | Eastern League | Worcester, MA | |
| Jud Smith | smith-001jud | 1900 | 5/14-5/30 | Buffalo Bisons | American League | Buffalo, NY | |
| Jud Smith | smith-001jud | 1900 | 6/1-9/19 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Melville Smith | smith-001mel | 1900 | Purdue College | College | , | ||
| Melville Smith | smith-001mel | 1900 | no g. | Milwaukee Brewers | American League | Milwaukee, WI | |
| Phenomenal Smith | smith-013joh | 1900 | 4/30-7/5 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Stub Smith | smith-001stu | 1900 | 4/30-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Tom Smith | smith-006tom | 1900 | 5/14-5/22 | Worcester Farmers | Eastern League | Worcester, MA | |
| William Smith | 1900 | Umpire | International League | , | |||
| William Smith | smith-089wil | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Homer Smoot | smoot-001hom | 1900 | 4/30-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Homer Smoot | smoot-001hom | 1900 | 6/18-7/4 | Worcester Farmers | Eastern League | Worcester, MA | |
| Homer Smoot | smoot-001hom | 1900 | 7/8-7/17 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Homer Smoot | smoot-001hom | 1900 | 7/18-9/12 | Worcester Farmers | Eastern League | Worcester, MA | |
| Burns Smythe | smythe001alf | 1900 | Oberlin Col. | College | , | ||
| Burns Smythe | smythe001alf | 1900 | 7/18-8/28 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Joe Snooks | snooks001jos | 1900 | no g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Joe Snooks | snooks001jos | 1900 | 15 g. | Pueblo Indians | Western League | Pueblo, CO | |
| Pop Snyder | snyder001pop | 1900 | Umpire | Connecticut State League | , | ||
| Pop Snyder | snyder001pop | 1900 | 41 g. | MLB Umpire | National League | , | |
| Scott Snyder | snyder001sco | 1900 | +6/10+ | Madison SD | Independent | Madison, SD | |
| Louis Sockalexis | sockal001chi | 1900 | 5/26-5/ | Windsor LocksCT | Independent | Windsor Locks, CT | |
| Louis Sockalexis | sockal001chi | 1900 | Hart.-Colt Co. | Independent | Hartford, CT | ||
| Byron Somers | somers000byr | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Charlie Somers | somers000cha | 1900 | Cleveland Lake Shores | American League | Cleveland, OH | ||
| Andy Sommerville | sommer001and | 1900 | 6/28-7/23+ | Wilmington | North Carolina Association | Wilmington, NC | |
| Sox Sorber | sorber001wal | 1900 | 5/11-7/12 | Troy Washerwomen | New York State League | Troy, NY | |
| Sox Sorber | sorber001wal | 1900 | 9/11-9/18 | Albany Senators | New York State League | Albany, NY | |
| Quinton Sorrell | 1900 | Auburn University | College | , | |||
| Holly Souders | souder001har | 1900 | 4/27-9/18 | Montreal Royals | Eastern League | Montreal, QC | |
| Bill Sparger | sparge001wil | 1900 | 5/26-6/14 | Denver Grizzlies | Western League | Denver, CO | |
| Tully Sparks | sparks001tho | 1900 | 4/24-9/17 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Speaks | speaks002--- | 1900 | 55 g. | Bloomington Blues | Central League | Bloomington, IL | |
| George Speer | speer-001geo | 1900 | 4/19-9/15 | Buffalo Bisons | American League | Buffalo, NY | |
| Dit Spencer | spence001d-- | 1900 | , | ||||
| Wirt Spencer | spence001wir | 1900 | , | ||||
| Harry Spies | spies-001hen | 1900 | 4/24-8/27 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Harry Spies | spies-001hen | 1900 | 8/29-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Jack Spratt | spratt001wil | 1900 | 4/30-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Jim St. Vrain | stvrai001jam | 1900 | 5/22- | 16 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| James Stafford | staffo001gen | 1900 | 4/26-9/22 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Robert Stafford | staffo003rob | 1900 | 6/25-8/19 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Chick Stahl | stahl-001cha | 1900 | 4/19-10/13 | 136 g. | Boston | National League | Boston, MA |
| George Stallings | stalli002geo | 1900 | 4/23-6/15 | Detroit Tigers | American League | Detroit, MI | |
| Joe Stanley | stanle003jos | 1900 | 6/1-6/13 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Matt Stanley | stanle001mat | 1900 | 4/1-12/2 | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Tom Stanton | stanto002tho | 1900 | 10/14 | 1 g. | St. Louis | National League | St. Louis, MO |
| William Staples | staple001wil | 1900 | 6 g. | Bloomington Blues | Central League | Bloomington, IL | |
| William Stark | stark-003wil | 1900 | 5/3 | Elmira | Atlantic League | Elmira, NY | |
| George Starnagle | starna001geo | 1900 | +6/29+ | Helena Senators | Montana State League | Sioux Falls, SD | |
| Harry Stauffer | stauff001hen | 1900 | 5/15 | Albany Senators | New York State League | Albany, NY | |
| Harry Stauffer | stauff001hen | 1900 | 7/1-7/4 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Stearns | 1900 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |||
| Charles Stecher | steche001cha | 1900 | 5/12- | Troy Washerwomen | New York State League | Troy, NY | |
| Fred Steele | steele001fre | 1900 | 34 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Farmer Steelman | steelm001mor | 1900 | 5/4-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Farmer Steelman | steelm001mor | 1900 | 10/11 | 1 g. | Brooklyn | National League | Brooklyn, NY |
| Joe Steen | steen-001jos | 1900 | Duquesne College | College | , | ||
| Gene Steere | steere001gen | 1900 | New Bedford | Independent | New Bedford, MA | ||
| Michael Steffani | steffa001mic | 1900 | 4/1-6/ | 17 g. | Oakland Oaks | California League | Oakland, CA |
| Michael Steffani | steffa001mic | 1900 | -9/23 | 27 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Henry Stein | 1900 | StL-JLHudsons | Independent | St. Louis, MO | |||
| Henry Stein | 1900 | St.L.-Alton Blues | Independent | St. Louis, MO | |||
| Harry Steinfeldt | steinf001har | 1900 | 4/19-10/14 | 134 g. | Cincinnati | National League | Cincinnati, OH |
| Stephens | stephe003--- | 1900 | 1 g. | Danville Champions | Central League | Danville, IL | |
| Reuben Stephenson | stephe001dum | 1900 | 5/7-5/9 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Sterns | sterns000--- | 1900 | 4/4- | U. Virginia | College | , | |
| Sterns | sterns000--- | 1900 | 6/28-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Jay Stetler | stetle001per | 1900 | Wmpt Store | Independent | , | ||
| Stevens | steven063--- | 1900 | +6/30+ | Wilmington | North Carolina Association | Wilmington, NC | |
| Ace Stewart | stewar001ace | 1900 | 5/15 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Ace Stewart | stewar001ace | 1900 | 1 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Ace Stewart | stewar001ace | 1900 | 6/1-9/18 | Kansas City Blues | American League | Kansas City, MO | |
| Delehanty Stewart | stewar000del | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Joe Stidham | stidha000joe | 1900 | 7/13-7/17+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Archie Stimmel | stimme001arc | 1900 | 4/30-6/9 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Archie Stimmel | stimme001arc | 1900 | 7/3-7/6 | 2 g. | Cincinnati | National League | Cincinnati, OH |
| Archie Stimmel | stimme001arc | 1900 | 7/11-9/18 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Walter Stolworthy | stolwo000tom | 1900 | +7/25+ | Bellows Falls | Independent | Bellows Falls, NH | |
| Harry Stoney | stoney001har | 1900 | Superior NB | Independent | Superior, NE | ||
| Story/Storey | story-001--- | 1900 | 2 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Tom Stouch | stouch001tom | 1900 | 4/30-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Fred Stout | stout-001fre | 1900 | 1 g. | Decatur Commodores | Central League | Decatur, IL | |
| Sammy Strang | strang001sam | 1900 | 5/5-9/4 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Sammy Strang | strang001sam | 1900 | 9/12-10/13 | 27 g. | Chicago | National League | Chicago, IL |
| Scott Stratton | stratt001sco | 1900 | 4/30-6/11 | Wilkes-Barre Coal Barons | Atlantic League | Wilkes-Barre, PA | |
| Scott Stratton | stratt001sco | 1900 | 6/18-9/22 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Julie Streib | streib001jul | 1900 | 72 g. | Stockton Wasps | California League | Stockton, CA | |
| Oscar Streit | streit001osc | 1900 | 4/30 | New Castle Quakers | Interstate League | New Castle, PA | |
| Oscar Streit | streit001osc | 1900 | 5/13-8/20 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Oscar Streit | streit001osc | 1900 | 8/24-9/15 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Cub Stricker | strick001cub | 1900 | Phil.-Crescents | Independent | Philadelphia, PA | ||
| Elmer Stricklett | strick001elm | 1900 | 5/2-6/9 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Elmer Stricklett | strick001elm | 1900 | 6/11-8/11 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Frederick Stripp | stripp001fre | 1900 | +4/5-6/2 | Kalamazoo Col. | College | , | |
| Charles Strobel | strobe001cha | 1900 | 4/28-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Billy Stroh | stroh-001wil | 1900 | 5/10-5/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Billy Stroh | stroh-001wil | 1900 | -8/2 | Rome Romans | New York State League | Rome, NY | |
| George Stroh | stroh-001geo | 1900 | 24 g. | Utica Reds | New York State League | Utica, NY | |
| George Stroh | stroh-001geo | 1900 | -7/21 | Rome Romans | New York State League | Rome, NY | |
| Con Strothers | stroth001joh | 1900 | 5/14,6/18-19 | Umpire | Interstate League | , | |
| Alf Strowger | strowg001alf | 1900 | 5/10-6/14 | Hamilton Hams | International League | Hamilton, ON | |
| Stuart | 1900 | Cuban X Giants | Black Baseball League | Cuban, | |||
| Stuffers | 1900 | NYSt | , | ||||
| Stultz | stultz002--- | 1900 | +5/21-6/8 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Henry Stultz | stultz001hen | 1900 | 4/1-12/2 | Sacramento Gilt Edges | California League | Sacramento, CA | |
| Ed Stutsman | stutsm001e-- | 1900 | Muskegon | Independent | Muskegon, MI | ||
| Ed Stutsman | stutsm001e-- | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Willie Sudhoff | sudhof001joh | 1900 | 4/25-10/14 | 35 g. | St. Louis | National League | St. Louis, MO |
| Joe Sugden | sugden001jos | 1900 | 4/21-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| George Suggs | suggs-001geo | 1900 | Kinston NC | Independent | Kinston, NC | ||
| Sullivan | sulliv098--- | 1900 | 5/11-5/20 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Sullivan | sulliv084--- | 1900 | Cortland Wagonmakers | New York State League | Cortland, NY | ||
| Billy Sullivan | sulliv006wil | 1900 | 4/19-10/13 | 72 g. | Boston | National League | Boston, MA |
| Chip Sullivan | sulliv003eug | 1900 | 5/15-8/9 | Derby Angels | Connecticut State League | Derby, CT | |
| George Sullivan | sulliv005geo | 1900 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | ||
| George Sullivan | sulliv005geo | 1900 | +7/4+ | Kingston ON | Independent | Kingston, ON | |
| Jack Sullivan | sulliv023joh | 1900 | 5/9-6/9 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Jack Sullivan | sulliv023joh | 1900 | 8/20-8/24 | Derby Angels | Connecticut State League | Derby, CT | |
| Jim Sullivan | sulliv006jam | 1900 | 5/26-11/29 | San Francisco Brewers | California League | San Francisco, CA | |
| John Sullivan | 1900 | 8/9 | Umpire | Connecticut State League | , | ||
| John Sullivan | sulliv004joh | 1900 | 4/20-4/30 | Kansas City Blues | American League | Kansas City, MO | |
| John Sullivan | sulliv004joh | 1900 | 6/10-9/4 | Denver Grizzlies | Western League | Denver, CO | |
| M.J. Sullivan | sulliv001m-- | 1900 | 8/7-8/10 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| M.J. Sullivan | sulliv000mj- | 1900 | Wallingford | Independent | Wallingford, CT | ||
| Mike Sullivan | sulliv005mic | 1900 | 4/30-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Suter Sullivan | sulliv002sut | 1900 | 4/19-5/18 | Detroit Tigers | American League | Detroit, MI | |
| Suter Sullivan | sulliv002sut | 1900 | 5/24-8/7 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Ollie Summers | summer001oli | 1900 | 5/4-5/10 | New London Whalers | Connecticut State League | New London, CT | |
| Ollie Summers | summer001oli | 1900 | 5/11-5/18 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Ollie Summers | summer001oli | 1900 | 6/5-6/7 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Ollie Summers | summer001oli | 1900 | +7/17+ | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Ollie Summers | summer001oli | 1900 | Statesville | North Carolina Association | Statesville, NC | ||
| Bill Sump | sump--001wil | 1900 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | ||
| William Sutch | sutch-001wil | 1900 | 4/30-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| William Sutch | sutch-001wil | 1900 | 6/14-7/5 | Hampton Crabs | Virginia League | Hampton, VA | |
| William Sutch | sutch-001wil | 1900 | 7/17-8/3 | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| William Sutch | sutch-001wil | 1900 | +8/7-8/23+ | Selma | Independent | Selma, AL | |
| William Sutch | sutch-001wil | 1900 | +9/13+ | Altoona Monarchs | Independent | Altoona, PA | |
| Al. Suterfield | 1900 | Nash.-Stars | Independent | Nashville, TN | |||
| Jack Sutthoff | suttho001joh | 1900 | 4/28-6/4 | Toronto Canucks | Eastern League | Toronto, ON | |
| Jack Sutthoff | suttho001joh | 1900 | 6/7-6/29 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Jack Sutthoff | suttho001joh | 1900 | 7/6-7/12 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Jack Sutthoff | suttho001joh | 1900 | 7/16-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Arthur Swaim | swaim-001art | 1900 | 47 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Cy Swaim | swaim-001cy- | 1900 | 4/28-9/15 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Harry Swalm | swalm-001har | 1900 | 4/30-5/9 | Dayton Veterans | Interstate League | Dayton, OH | |
| Harry Swalm | swalm-001har | 1900 | 13 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Harry Swalm | swalm-001har | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Ginger Swarts | 1900 | 14 g. | Fresno | San Joaquin | Fresno, CA | ||
| Robert Swearingen | sweari002rob | 1900 | +8/19+ | Sedalia | Independent | Sedalia, MO | |
| Norcum Sweeney | sweene038--- | 1900 | +5/18-6/2+ | Wilm-Naval Res. | Independent | , | |
| Norcum Sweeney | sweene038--- | 1900 | +7/30-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Sweet | sweet-004--- | 1900 | 7/2 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Charlie Swindells | swinde001cha | 1900 | 5/22-8/14 | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Charlie Swindells | swinde001cha | 1900 | 8/19 | Oakland Oaks | California League | Oakland, CA | |
| Arthur Switzer | switze001art | 1900 | Schenectady Electricians | New York State League | Schenectady, NY | ||
| Len Swormstedt | sworms001leo | 1900 | 5/13-6/ | Albany Senators | New York State League | Albany, NY | |
| Earl Tabor | tabor-001ear | 1900 | 11 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Dangerfield Talbert | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | |||
| Bob Talbot | talbot001rob | 1900 | 5/11-9/8 | Albany Senators | New York State League | Albany, NY | |
| Tamber | tamber001--- | 1900 | Anaconda Serpents | Montana State League | Anaconda, MT | ||
| James Tamsett | tamset001jam | 1900 | -8/25 | 96 g. | Rome Romans | New York State League | Rome, NY |
| James Tamsett | tamset001jam | 1900 | 8/28-9/18 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Jesse Tannehill | tanneh001jes | 1900 | 4/21-10/13 | 34 g. | Pittsburgh | National League | Pittsburgh, PA |
| Lee Tannehill | tanneh002lee | 1900 | 4/30-6/13 | Richmond Blue Birds | Virginia League | Richmond, VA | |
| Robert Tarleton | tarlet001rob | 1900-02 | Morgan City LA | Independent | Morgan City, LA | ||
| Harry Tate | tate--001har | 1900 | 4/30-5/30 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| John Tate | 1900 | +7/26+ | Charleroi Elks | Independent | Charleroi, PA | ||
| Taylor | taylor057--- | 1900 | +5/9-5/11+ | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Taylor | taylor016--- | 1900 | 5/26-5/27 | Pueblo Indians | Western League | Pueblo, CO | |
| Taylor | taylor037--- | 1900 | 8/29 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Taylor | taylor028--- | 1900 | 9/11 | New Castle Quakers | Interstate League | New Castle, PA | |
| Billy Taylor | taylor002bil | 1900 | 4/28-9/16 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| George Taylor | taylor007geo | 1900 | Chicago Columbia Giants | Black Baseball | Chicago, IL | ||
| Jack Taylor | taylor014joh | 1900 | 4/24-10/8 | 28 g. | Chicago | National League | Chicago, IL |
| Luther Taylor | taylor001lut | 1900 | 5/12-7/21 | Albany Senators | New York State League | Albany, NY | |
| Luther Taylor | taylor001lut | 1900 | 8/27-10/13 | 11 g. | New York | National League | New York, NY |
| Luther Taylor | taylor001lut | 1900 | San Diego | Southern California League | San Diego, CA | ||
| Robert Taylor | taylor015rob | 1900 | 7/5-9/6 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Roy Taylor | taylor005r-- | 1900 | 5/17-5/30 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Wally Taylor | taylor001wal | 1900 | 4/28-6/27 | Toronto Canucks | Eastern League | Toronto, ON | |
| Wally Taylor | taylor001wal | 1900 | 6/28-7/8 | Montreal Royals | Eastern League | Montreal, QC | |
| Wally Taylor | taylor001wal | 1900 | 7/20-8/22 | Syracuse Stars | Eastern League | Syracuse, NY | |
| George Tebeau | tebeau002geo | 1900 | 5/6-5/8 | Denver Grizzlies | Western League | Denver, CO | |
| Patsy Tebeau | tebeau001pat | 1900 | 6/12 | 1 g. | St. Louis | National League | St. Louis, MO |
| Fred Tenney | tenney001fre | 1900 | 4/19-10/13 | 112 g. | Boston | National League | Boston, MA |
| Adonis Terry | terry-001ado | 1900 | 39 g. | MLB Umpire | National League | , | |
| Grant Thatcher | thatch001uly | 1900 | 5/11-9/3 | Troy Washerwomen | New York State League | Troy, NY | |
| Warren Thatcher | thatch001w-- | 1900 | 5/16 | Hamilton Hams | International League | Hamilton, ON | |
| Nicholas Thayer | thayer001nic | 1900 | 6 g. | Anaconda Serpents | Montana State League | Anaconda, MT | |
| Joseph Theisen | theise001jos | 1900 | 5/9-9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Otto Thiel | thiel-001ott | 1900 | 4/20-5/6 | Kansas City Blues | American League | Kansas City, MO | |
| Otto Thiel | thiel-001ott | 1900 | 5/10- | 90 g. | Des Moines Hawkeyes | Western League | Des Moines, IA |
| Henry Thielman | thielm001hen | 1900 | , | ||||
| Jake Thielman | thielm001joh | 1900 | 5/22-9/23 | Butte Smoke Eaters | Montana State League | Butte, MT | |
| Thomas | thomas071--- | 1900 | 5/21 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Thomas | thomas026--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Thomas | 1900 | 1 g. | Bakersfield | San Joaquin | Bakersfield, CA | ||
| Thomas | 1900 | 7 g. | Visalia | San Joaquin | Visalia, CA | ||
| Frosty Thomas | thomas001for | 1900 | Buchanan Co. MO | High School | , MO | ||
| Joe Thomas | thomas001tho | 1900 | Marysville | Northern California League | Marysville, CA | ||
| R.A. Thomas | thomas000ra- | 1900 | 7/2-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Ralph Thomas | thomas004ral | 1900 | 5/10-7/6 | New London Whalers | Connecticut State League | New London, CT | |
| Ralph Thomas | thomas004ral | 1900 | 7/14-7/19 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Ralph Thomas | thomas004ral | 1900 | Derby Angels | Connecticut State League | Derby, CT | ||
| Roy Thomas | thomas002roy | 1900 | 4/19-10/13 | 140 g. | Philadelphia | National League | Philadelphia, PA |
| Thomas Thomas | thomas007tho | 1900 | +5/6-5/24+ | Anderson | Indiana State League | Anderson, IN | |
| Thomas Thomas | thomas007tho | 1900 | 6/18-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Tom Thomas | thomas005tho | 1900 | 5/16-6/18 | 5 g. | St. Louis | National League | St. Louis, MO |
| Tom Thomas | thomas005tho | 1900 | 7/22-7/30 | Kansas City Blues | American League | Kansas City, MO | |
| Tom Thomas | thomas005tho | 1900 | 9/3-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Thompson | 1900 | 5/15-6/5 | Norwich Witches | Connecticut State League | Norwich, CT | ||
| Thompson | thomps002--- | 1900 | 46 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| Thompson | thomps002--- | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Thompson | thomps003--- | 1900 | 1 g. | Decatur Commodores | Central League | Decatur, IL | |
| Thompson | thomps004--- | 1900 | 5/24-7/4 | Chatham Reds | International League | Chatham, ON | |
| Thompson | thomps004--- | 1900 | 7/21-8/2 | London Tecumsehs | International League | London, ON | |
| Thompson | thomps005--- | 1900 | 6/22-7/2 | Port Huron Tunnelites | International League | Port Huron, MI | |
| Andy Thompson | thomps006and | 1900 | 5/1-5/9 | Elmira | Atlantic League | Elmira, NY | |
| Billy Thompson | thomps003bil | 1900 | Cuban Giants | Black Baseball | , | ||
| John Thompson | thomps015joh | 1900 | 7/24-8/19 | Omaha Omahogs | Western League | Omaha, NE | |
| W.S. Thompson | thomps002w-- | 1900 | Amherst College | College | , | ||
| W.S. Thompson | thomps002w-- | 1900 | 7/7 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| William Thompson | 1900 | Genuine Cuban Giants | Independent | Genuine, | |||
| Pat Thornton | thornt004joh | 1900 | 6/18-6/21 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Pat Thornton | thornt004joh | 1900 | 6/22-7/10 | Umpire | Virginia League | , | |
| Hal Thruman | 1900 | +6/7+ | Univ. Missouri | College | , | ||
| Hal Thruman | 1900 | Univ. Missouri | College | , | |||
| Billy Thurman | thurma001bil | 1900 | 3 g. | Azusa | Southern California League | Azusa, CA | |
| Ned Thurston | 1900 | North Adams | Independent | North Adams, MA | |||
| Ned Thurston | 1900 | Hinsdale | Independent | Hinsdale, NH | |||
| Pat Tibald | tibald001pet | 1900 | 5/11-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| George Tieman | tieman001geo | 1900-02 | Fort Wayne Shamrocks | Independent | Fort Wayne, IN | ||
| Mike Tiernan | tierna001mik | 1900 | 5/10-5/31 | Derby Angels | Connecticut State League | Derby, CT | |
| Mark Tierney | tierne004mar | 1900 | 5/2-5/16 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Mark Tierney | tierne004mar | 1900 | 5/23-6/11 | Petersburg Farmers | Virginia League | Petersburg, VA | |
| Mark Tierney | tierne004mar | 1900 | 6/12 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Mark Tierney | tierne004mar | 1900 | 6/14-7/9+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Jack Tighe | tighe-001joh | 1900 | 5/10-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Tilton | 1900 | 1 g. | Hanford | San Joaquin | Hanford, CA | ||
| Joe Tinker | tinker001jos | 1900 | 32 g. | Denver Grizzlies | Western League | Denver, CO | |
| Joe Tinker | tinker001jos | 1900 | 23 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Joe Tinker | tinker001jos | 1900 | -9/23 | 30 g. | Helena Senators | Montana State League | Helena, MT |
| Toben | 1900 | Reading Browns | Independent | Reading, PA | |||
| Tobeyon | tobeyo001--- | 1900 | 8/29 | Rome Romans | New York State League | Rome, NY | |
| Charles Todd | 1900 | Georgia Tech | College | , | |||
| Jack Toft | toft--001jam | 1900 | 4/30-6/9 | Scranton Miners | Atlantic League | Scranton, PA | |
| Jack Toft | toft--001jam | 1900 | 6/20-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Jimmy Toman | toman-001jam | 1900 | 104 g. | Omaha Omahogs | Western League | Omaha, NE | |
| Doc Tonkin | tonkin001har | 1900-07 | U. of Maryland | College | , | ||
| Cy Torrence | torren001osc | 1900 | 38 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Cy Torrence | torren001osc | 1900 | Danville Champions | Central League | Danville, IL | ||
| Cy Townsend | townse002cha | 1900 | +5/16-9/8 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Happy Townsend | townse001joh | 1900 | Chester | Independent | Chester, PA | ||
| Happy Townsend | townse001joh | 1900 | 7/2-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Tracy | tracy-005--- | 1900 | 9/8 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Charles Traeger | traege002cha | 1900 | no g. | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Bill Traffley | traffl001bil | 1900 | Umpire | Western League | , | ||
| Wix Treadway | treadw001win | 1900 | -9/11 | 9 g. | Helena Senators | Montana State League | Helena, MT |
| Bert Treanor | treano001ber | 1900 | 7 g. | San Diego | Southern California League | San Diego, CA | |
| Vere Treichler | treich001--- | 1900 | +7/31+ | Lititz PA | Independent | Lititz, PA | |
| Vere Treichler | treich001--- | 1900 | Franklin & Marshall | College | , | ||
| J. Trenberth | trenbe001j-- | 1900 | 1 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Solly Tripp | tripp-001sol | 1900 | 4 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Trobough | 1900 | Tobias NE HS | High School | , | |||
| Mike Trost | trost-001mik | 1900 | 5/5-5/30 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Mike Trost | trost-001mik | 1900 | 6/5-6/23 | Umpire | Virginia League | , | |
| Albert Troup | 1900 | Masten Park HS | High School | , | |||
| Harry Truby | truby-002har | 1900 | 4/28-5/3 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Harry Truby | truby-002har | 1900 | 5/13-9/16 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Fred Tucker | tucker001f-- | 1900 | Waverly NY | Independent | Waverly, NY | ||
| Tommy Tucker | tucker003tho | 1900 | 4/28-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Ike Tufts | 1900 | 6 g. | Fresno | San Joaquin | Fresno, CA | ||
| Ray Tufts | 1900 | 12 g. | Fresno | San Joaquin | Fresno, CA | ||
| Herman Tull | tull--001h-- | 1900 | 5/11-7/28 | Oswego Grays/Elmira Pioneers | New York State League | Oswego, NY | |
| Herman Tull | tull--001h-- | 1900 | 8/1-9/1 | Oswego Grays/Elmira Pioneers | New York State League | Elmira, NY | |
| Arthur Turner | turner000art | 1900 | Trinity (Duke U) | College | , | ||
| Arthur Turner | turner000art | 1900 | 6/25-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| Daniel Turner | turner003dan | 1900 | 4/28-9/16 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Jack Turner | turner004jac | 1900 | +8/13+ | Grand Forks | Independent | Grand Forks, ND | |
| Terry Turner | turner001ter | 1900 | Greenville | Independent | Greenville, PA | ||
| Thomas Turner | turner006tho | 1900 | 4/28-9/2 | Wheeling Stogies | Interstate League | Wheeling, WV | |
| Tuck Turner | turner002tuc | 1900 | 4/26-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Lee Tutt | tutt--001--- | 1900 | 5/22- | 20 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Art Twineham | twineh002art | 1900 | Des Moines Hawkeyes | Western League | Des Moines, IA | ||
| Uhler | uhler-000--- | 1900 | Chicago Unions | Black Baseball | Chicago, IL | ||
| Fred Underwood | underw002fre | 1900 | 41 g. | St. Joseph Saints | Western League | St. Joseph, MO | |
| Bob Unglaub | unglau002rob | 1900 | Univ. of Maryland | College | , | ||
| Bob Unglaub | unglau002rob | 1900 | 5/9-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Bob Unglaub | unglau002rob | 1900 | 9/10-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| Tommy Uniac | uniac-001tho | 1900 | Thayer Academy | High School | , | ||
| Tommy Uniac | uniac-001tho | 1900 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | ||
| Bill Urquhart | urquha001wil | 1900 | 4/26-9/23 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Lon Ury | ury---001lou | 1900 | Galena KS | Galena, KS | |||
| Jerome Utley | utley-001jer | 1900-03 | U. of Michigan | College | , | ||
| Bob Vail | vail--001rob | 1900 | Wmpt Store | Independent | , | ||
| Arturo Valdes | valdes000art | 1900 | Almendarista | Cuban League | , | ||
| Rogelio Valdes | valdes002rog | 1900 | San Francisco | Cuban League | , | ||
| Simon Valdes | valdes000sim | 1900 | Cubano | Cuban League | , | ||
| Charles Van Anin | vanarm001cha | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Deacon Van Buren | vanbur001edw | 1900 | 4/28-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Van Burssman | 1900 | 1 g. | Bloomington Blues | Central League | Bloomington, IL | ||
| Van Burssman | vanbur001--- | 1900 | Bloomington Blues | Central League | Bloomington, IL | ||
| Dow Van Dine | vandin001dow | 1900 | Pittsburg | Independent | Pittsburg, KS | ||
| Bill Van Dyke | vandyk001bil | 1900 | 5/5-5/11 | Umpire | Western League | , | |
| Colbert Van Giesen | vangie001col | 1900 | 4/30-6/5 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| George Van Haltren | vanhal001geo | 1900 | 4/19-10/13 | 141 g. | New York | National League | New York, NY |
| George Van Haltren | vanhal001geo | 1900 | Umpire | California League | , | ||
| Charley Van Horn | vanhor002cha | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Charley Van Horn | vanhor002cha | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Charley Van Horn | vanhor002cha | 1900 | 1 g. | San Diego | Southern California League | San Diego, CA | |
| Charley Van Horn | vanhor002cha | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Ike Van Zandt | vanzan001cha | 1900 | 6/6-6/23 | New London Whalers | Connecticut State League | New London, CT | |
| Joe VanderWeg | vander005--- | 1900 | +8/27+ | Grand Rapids All-Stars | Independent | Grand Rapids, MI | |
| Dike Varney | varney001law | 1900-01 | Dartmouth Col. | College | , | ||
| Cal Vasbinder | vasbin001mos | 1900 | +5/11-5/15+ | Kokomo | Indiana State League | Kokomo, IN | |
| Cal Vasbinder | vasbin001mos | 1900 | Cadiz | Independent | Cadiz, OH | ||
| Farmer Vaughn | vaughn001far | 1900 | , | ||||
| Phil Veach | 1900 | 26 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | ||
| Phil Veatch | veach-001phi | 1900 | Memphis | Independent | Memphis, TN | ||
| Phil Veatch | veach-001phi | 1900 | 6/11- | 26 g. | Terre Haute Hottentots | Central League | Terre Haute, IN |
| Bucky Veil | veil--001fre | 1900-02 | Bucknell Univ. | College | , | ||
| Bucky Veil | veil--001fre | 1900 | 5/17- | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Joseph Veitch | veitch001jos | 1900 | 5/23-5/29 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Phil Vetter | vetter001phi | 1900 | Loui.-Reccius | Independent | Louisville, KY | ||
| Lee Viau | viau--001lee | 1900 | 4/30-5/24 | Newark Colts | Atlantic League | Newark, NJ | |
| Lee Viau | viau--001lee | 1900 | -9/8 | 27 g. | Binghamton Crickets | New York State League | Binghamton, NY |
| Philip Viau | viau--001phi | 1900 | Fall River | New England League | Fall River, MA | ||
| Rube Vickers | vicker001har | 1900 | 6/9 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Rube Vickers | vicker001har | 1900 | 7/28 | New Castle Quakers | Interstate League | New Castle, PA | |
| Vickery | vicker004--- | 1900 | Buffalo Bisons | American League | Buffalo, NY | ||
| F. Vickery | 1900 | St. Joseph Saints | Western League | St. Paul, MN | |||
| Tom Vickery | vicker001tom | 1900 | 5/10-5/16 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Julio Vidal | vidal-000jul | 1900 | Cubano | Cuban League | , | ||
| Sammy Vigneux | vignea001sam | 1900 | 4/30- | Jersey City City | Atlantic League | Jersey City, NJ | |
| Sammy Vigneux | vignea001sam | 1900 | 25 g. | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Sammy Vigneux | vignea001sam | 1900 | -6/9 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Sammy Vigneux | vignea001sam | 1900 | 6/14-9/8 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| George Villeman | villem001geo | 1900 | 5/11-9/3 | Utica Reds | New York State League | Utica, NY | |
| Rony Viox | viox--001hen | 1900 | no g. | St. Joseph Saints | Western League | St. Joseph, MO | |
| Rony Viox | viox--001hen | 1900 | 4/20-7/15 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Harry Vitter | vitter001har | 1900 | Morgan City LA | Independent | Morgan City, LA | ||
| Roland Vitter | vitter001rol | 1900 | Morgan City LA | Independent | Morgan City, LA | ||
| James Vizard | vizard001jam | 1900 | 32 g. | Denver Grizzlies | Western League | Denver, CO | |
| Oscar Vogeding | 1900 | +8/11-9/1+ | Westville NJ | Independent | Westville, NJ | ||
| Jim Vollendorf | vollen001ado | 1900 | 4/30-5/3 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Jim Vollendorf | vollen001ado | 1900 | 5/10-9/7 | New Haven Blues | Connecticut State League | New Haven, CT | |
| Voorhees | 1900 | Rome Romans | New York State League | Rome, NY | |||
| Cy Vorhees | vorhee001hen | 1900 | 4/30-5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Cy Vorhees | vorhee001hen | 1900 | Chester | Independent | Chester, PA | ||
| Cy Vorhees | vorhee001hen | 1900 | 7/2-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| William Vought | vought002wil | 1900 | 5/10-6/2 | Norwich Witches | Connecticut State League | Norwich, CT | |
| William Vought | vought002wil | 1900 | 6/9-6/23 | New London Whalers | Connecticut State League | New London, CT | |
| William Vought | vought002wil | 1900 | 7/20-7/29 | Rome Romans | New York State League | Rome, NY | |
| Les Wachtell | wachte000les | 1900 | 5/5-6/8 | Muncie | Indiana State League | Muncie, IN | |
| Rube Waddell | waddel001geo | 1900 | 4/19-7/5 | 30 g. | Pittsburgh | National League | Pittsburgh, PA |
| Rube Waddell | waddel001geo | 1900 | 7/26-8/31 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Rube Waddell | waddel001geo | 1900 | 9/3-10/11 | 30 g. | Pittsburgh | National League | Pittsburgh, PA |
| Ernie Wade | wade--002ern | 1900 | 8/24-8/27 | New London Whalers | Connecticut State League | New London, CT | |
| Jack Wadsworth | wadswo002jac | 1900 | 4/28-9/16 | New Castle Quakers | Interstate League | New Castle, PA | |
| Wagner | wagner022--- | 1900 | NYC-LouisvilleAC | Independent | New York, NY | ||
| Wagner | wagner009--- | 1900 | +5/9-6/8 | Wabash | Indiana State League | Wabash, IN | |
| Butts Wagner | wagner001but | 1900 | 4/19-7/22 | Kansas City Blues | American League | Kansas City, MO | |
| Honus Wagner | wagner004joh | 1900 | 4/19-10/13 | 135 g. | Pittsburgh | National League | Pittsburgh, PA |
| Johnny Wagner | wagner005joh | 1900 | 6/5-6/14 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Johnny Wagner | wagner005joh | 1900 | Jamestown NY | Independent | Jamestown, NY | ||
| Johnny Wagner | wagner005joh | 1900 | 7/10-7/19+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Bert Wakefield | wakefi000ber | 1900 | Chicago Unions | Black Baseball League | Chicago, IL | ||
| Irv Waldron | waldro001irv | 1900 | 4/21-9/18 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Walker | walker056--- | 1900 | 2 g. | Great Falls Indians | Montana State League | Great Falls, MT | |
| Tom Walker | walker006tho | 1900 | 4/27-7/2 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Tom Walker | walker006tho | 1900 | 7/12-9/4 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Tom Walker | walker006tho | 1900 | 9/10-9/18 | Rochester Bronchos | Eastern League | Rochester, NY | |
| Henry Wall | wall--001hen | 1900 | 1 g. | San Diego | Southern California League | San Diego, CA | |
| Joe Wall | wall--005jos | 1900 | 5/5-6/15 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| Joe Wall | wall--005jos | 1900 | +6/26-7/11 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Joe Wall | wall--005jos | 1900 | 8/4-8/9 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Bobby Wallace | wallac002rho | 1900 | 126 g. | St. Louis | National League | St. Louis, MO | |
| Gardner Wallace | wallac001gar | 1900 | 5/26-5/29 | New London Whalers | Connecticut State League | New London, CT | |
| Waller | waller001--- | 1900 | 7/11,9/3 | Omaha Omahogs | Western League | Omaha, NE | |
| Walsh | walsh-003--- | 1900 | 5/27 | London Tecumsehs | International League | London, ON | |
| Walsh | walsh-040--- | 1900 | 5/5 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Walsh | walsh-063--- | 1900 | 8/6-8/11 | Mansfield Haymakers | Interstate League | Mansfield, OH | |
| Ed Walsh | walsh-002edw | 1900-03 | St. John's(Fordham) | College | , | ||
| William Walsh | walsh-007wil | 1900 | 5/11-5/22 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Walters | walter015--- | 1900 | no g. | Toronto Canucks | Eastern League | Toronto, ON | |
| Walters | walter015--- | 1900 | 4/30-5/24 | Newark Colts | Atlantic League | Newark, NJ | |
| Jack Walters | walter001joh | 1900 | 4/26-9/19 | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| Jack Walters | walter001joh | 1900 | no g. | Providence Clamdiggers/Grays | Eastern League | Providence, RI | |
| John Walters | walter006joh | 1900 | Sheboygan WI | Independent | Sheboygan, WI | ||
| John Walters | walter006joh | 1900 | 8/8-8/22 | Cleveland Lake Shores | American League | Cleveland, OH | |
| John Walters | walter006joh | 1900 | no g. | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Roxey Walters | walter001lou | 1900 | 95 g. | Danville Champions | Central League | Danville, IL | |
| Roxey Walters | walter001lou | 1900 | +9/6+ | Fox Lake WI | Independent | Fox Lake, WI | |
| Waltman | waltma001--- | 1900 | +5/16+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Ward | ward--067--- | 1900 | +6/27+ | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Ward | ward--066--- | 1900 | +7/3-7/7+ | Wilmington | North Carolina Association | Wilmington, NC | |
| Piggy Ward | ward--002fra | 1900 | 4/26-5/2 | Worcester Farmers | Eastern League | Worcester, MA | |
| Piggy Ward | ward--002fra | 1900 | 5/11-7/9 | Hartford Indians/Wooden Nutmegs | Eastern League | Hartford, CT | |
| Piggy Ward | ward--002fra | 1900 | 7/23-9/8 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Ware | ware--006--- | 1900 | 7/6 | Hampton Crabs | Virginia League | Hampton, VA | |
| Clyde Wares | wares-001cly | 1900 | KalaCity | , | |||
| Al Warner | warner002al- | 1900 | 7/24-8/19 | Umpire | Western League | , | |
| Al Warner | warner002al- | 1900 | -8/26 | 2 g. | MLB Umpire | National League | , |
| Bobby Warner | warner002rob | 1900 | +7/30+ | Sioux Falls | Independent | Sioux Falls, SD | |
| Jack Warner | warner002joh | 1900 | 34 g. | New York | National League | New York, NY | |
| Mum Warrender | warren002fra | 1900 | 77 g. | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Mum Warrender | warren002fra | 1900 | Schenectady Electricians | New York State League | Schenectady, NY | ||
| Libe Washburn | washbu001lib | 1900 | Brown University | College | , | ||
| Libe Washburn | washbu001lib | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Buck Washer | washer001wil | 1900 | Bucktel Colllege | College | , | ||
| Bill Watkins | watkin002bil | 1900 | 4/19-9/8 | Indianapolis Hoosiers | American League | Indianapolis, IN | |
| Charles Watkins | watkin002cha | 1900 | U. of Michigan | College | , | ||
| Charles Watkins | watkin002cha | 1900 | 6/17-9/15 | Dayton Veterans | Interstate League | Dayton, OH | |
| John Watkins | 1900 | Genuine Cuban Giants | Independent | Genuine, | |||
| Scott Watson | 1900-03 | Stoneham HS | High School | , | |||
| William Wayne | wayne-001wil | 1900 | 6/3-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Clarence Weakley | weakle001cla | 1900 | 5/30+ | Kokomo | Indiana State League | Kokomo, IN | |
| Dick Weand | weand-001geo | 1900 | Norristown | Independent | Norristown, PA | ||
| Buck Weaver | weaver002buc | 1900 | 4/30-7/10+ | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Farmer Weaver | weaver001far | 1900 | 4/26-5/11 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Farmer Weaver | weaver001far | 1900 | 5/19-6/25 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Farmer Weaver | weaver001far | 1900 | 7/11- | 25 g. | Denver Grizzlies | Western League | Denver, CO |
| Farmer Weaver | weaver001far | 1900 | 27 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| John Weaver | weaver003joh | 1900 | Richmond IN | Independent | Richmond, IN | ||
| John Weaver | weaver003joh | 1900 | 5/30-6/15 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Kid Weaver | weaver001kid | 1900 | 5/19-6/18 | Newport News Shipbuilders | Virginia League | Newport News, VA | |
| Charlie Weber | weber-003cha | 1900 | , | ||||
| Edward Webster | webste001edw | 1900 | 5/6-5/20 | Denver Grizzlies | Western League | Denver, CO | |
| Pete Weckbecker | weckbe001pet | 1900 | 4/30-5/22 | Portsmouth Boers | Virginia League | Portsmouth, VA | |
| Pete Weckbecker | weckbe001pet | 1900 | 6/4-6/11 | Umpire | Virginia League | , | |
| Al Weddige | weddig001alb | 1900 | Greenville | Independent | Greenville, PA | ||
| Billy Wedlake | wedlak001--- | 1900 | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | ||
| Fred Weed | weed--001fre | 1900 | 7 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Fred Weed | weed--001fre | 1900 | 3 g. | Oakland Oaks | California League | Oakland, CA | |
| Fred Weed | weed--001fre | 1900 | Maryville | Northern California League | Marysville, CA | ||
| Genser Weidensaul | weiden001yen | 1900 | 7/9-7/11 | Norfolk Phenoms | Virginia League | Norfolk, VA | |
| Genser Weidensaul | weiden001yen | 1900 | +7/20+ | Durham Bulls | North Carolina Association | Durham, NC | |
| Curt Weigand | weigan001cur | 1900 | Chester Athletics | Independent | Chester, PA | ||
| Frank Weikart | weiker001fra | 1900 | 91 g. | Decatur Commodores | Central League | Decatur, IL | |
| Jake Weimer | weimer001jac | 1900 | 5/5-9/4 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Louis Weisbecker | weisbe001lou | 1900 | 4/30-5/5 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Louis Weisbecker | weisbe001lou | 1900 | 5/10-9/8 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Welch | welch-064--- | 1900 | Cuban Giants | Black Baseball | , | ||
| Jake Wells | wells-001jak | 1900 | 6/1-6/6 | President | Virginia League | , | |
| Fred Wenig | wenig-001fre | 1900 | no g. | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Fred Wenig | wenig-001fre | 1900 | 13 g. | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Jack Wente | wente-001jac | 1900 | Syra.-Pastimes | Independent | Syracuse, NY | ||
| Perry Werden | werden001per | 1900 | 4/19-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Charles Werner | werner001j-- | 1900 | Fleischman’s | Independent | Cincinnati, OH | ||
| Frank West | west--002fra | 1900 | 4/30-6/14 | Allentown Peanuts | Atlantic League | Allentown, PA | |
| Gus Weyhing | weyhin001aug | 1900 | 5/8-7/25 | 7 g. | St. Louis | National League | St. Louis, MO |
| Gus Weyhing | weyhin001aug | 1900 | 8/7-9/18 | 8 g. | Brooklyn | National League | Brooklyn, NY |
| Jimmy Whalen | whalen003wil | 1900 | 4/1- | 47 g. | Stockton Wasps | California League | Stockton, CA |
| Babe Whaling | whalin001f-- | 1900 | 3 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Bill Whaling | whalin001bil | 1900 | 3 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Tom Whealon | whealo001tho | 1900 | Arkansas City | Independent | Arkansas City, AR | ||
| Ed Wheeler | wheele003edw | 1900 | 4/19-4/20 | Detroit Tigers | American League | Detroit, MI | |
| Ed Wheeler | wheele003edw | 1900 | 4/28-9/16 | Dayton Veterans | Interstate League | Dayton, OH | |
| George Wheeler | wheele002geo | 1900 | 4/22-6/3 | Milwaukee Brewers | American League | Milwaukee, WI | |
| George Wheeler | wheele002geo | 1900 | -9/8 | 33 g. | Rome Romans | New York State League | Rome, NY |
| John Wheeler | wheele002joh | 1900 | Salem | Salem, | |||
| Bobby Wheelock | wheelo001bob | 1900 | 5/10-5/21 | New London Whalers | Connecticut State League | New London, CT | |
| Whisner | 1900 | Ashtabula | Semi-professional | Ashtabula, OH | |||
| Lew Whistler | whistl002lew | 1900 | +5/23-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Whitaker | whitak005--- | 1900 | +5/8+ | U. Maryland | College | , | |
| Whitaker | whitak005--- | 1900 | +7/4+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| White | white-003--- | 1900 | 7/2 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Doc White | white-001guy | 1900 | Georgetown Col. | College | , | ||
| H. White | white-001h-- | 1900 | 2 g. | San Francisco Brewers | California League | San Francisco, CA | |
| H. White | white-001h-- | 1900 | 1 g. | Bakersfield | San Joaquin | Bakersfield, CA | |
| Jack White | white-012joh | 1900 | 4/20-5/26 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Jack White | white-012joh | 1900 | 6/1-9/23 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Mollie White | white-002m-- | 1900 | Stockton Wasps | California League | Stockton, CA | ||
| Mollie White | white-002m-- | 1900 | 4 g. | Fresno | San Joaquin | Fresno, CA | |
| Roy White | white-004roy | 1900 | Richmond Col. | College | , | ||
| Roy White | white-004roy | 1900 | Piedmont SC | Independent | Piedmont, SC | ||
| Roy White | white-004roy | 1900 | 7/19-8/3 | Charlotte Presbyterians | North Carolina Association | Charlotte, NC | |
| Sol White | white-001kin | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | ||
| Ed. Whiteman | whitma004--- | 1900 | +5/17+ | Logansport/Elwood Wanderers | Indiana State League | Elwood, IN | |
| Jesse Whiting | whitin002jes | 1900 | 4/30-5/31 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Herbert Whitney | whitle001her | 1900 | 5/22- | 10 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Al Whitridge | whitri001alb | 1900 | +5/10-5/26+ | Wabash | Indiana State League | Wabash, IN | |
| Al Whitridge | whitri001alb | 1900 | 7/1-9/4 | Pueblo Indians | Western League | Pueblo, CO | |
| Raymond Whitted | whitte001ray | 1900 | 5/6-6/2 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Buck Whittemore | whitte000buc | 1900 | Brown University | College | , | ||
| Buck Whittemore | whitte000buc | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Bob Wicker | wicker001rob | 1900 | 5/3-9/9 | Dayton Veterans | Interstate League | Dayton, OH | |
| C.W. Wickizer | wickhe001c-- | 1900 | , | ||||
| C.W. Wickizer | wickhe001c-- | 1900 | Nevada MO | Independent | Nevada, MO | ||
| Jimmy Wiggs | wiggs-001jam | 1900 | no g. | Minneapolis Millers | American League | Minneapolis, MN | |
| Jimmy Wiggs | wiggs-001jam | 1900 | 6/7-6/26 | London Tecumsehs | International League | London, ON | |
| Wilcox | wilcox019--- | 1900 | +5/8+ | U. of No Carolina | College | , | |
| Wilcox | wilcox019--- | 1900 | 6/25-7/12 | Wilmington | North Carolina Association | Wilmington, NC | |
| Wilder | wilder006--- | 1900 | 6/9 | Pueblo Indians | Western League | Pueblo, CO | |
| Wilder | 1900 | Wesleyan Col | College | , | |||
| Wid Wilder | wilder000wid | 1900 | 6/29-9/6 | Malone | Northern New York League | Malone, NY | |
| Horace Wilds | wilds-001hor | 1900 | 3 g. | Azusa | Southern California League | Azusa, CA | |
| Jack Wiley | wiley-001joh | 1900 | -7/16 | 41 g. | Albany Senators | New York State League | Albany, NY |
| Harry Wilhelm | wilhel002har | 1900 | 5/12-5/14 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Harry Wilhelm | wilhel002har | 1900 | +5/28-9/8 | Troy Washerwomen | New York State League | Troy, NY | |
| Bob Wilkins | wilkin000bob | 1900 | +3/23-4/29+ | Trinity College | College | , | |
| Bob Wilkins | wilkin000bob | 1900 | Wm. Bingham | School | , | ||
| Bob Wilkins | wilkin000bob | 1900 | 6/25-8/4 | Durham Bulls | North Carolina Association | Durham, NC | |
| George Wilkinson | wilkin003geo | 1900 | 80 g. | Decatur Commodores | Central League | Decatur, IL | |
| Jack Wilkinson | wilkin004jac | 1900 | Mattoon IL | Independent | Mattoon, IL | ||
| Williams | willia353--- | 1900 | Thayer Academy | High School | , | ||
| Williams | willia353--- | 1900 | 6/25-8/4 | Tarboro Tarheels | North Carolina Association | Tarboro, NC | |
| Williams | willia012--- | 1900 | +5/15-6/8 | Anderson | Indiana State League | Anderson, IN | |
| Williams | 1900 | Tufts College | College | , | |||
| Williams | 1900 | Attleboro | Independent | Attleboro, MA | |||
| Williams | willia006--- | 1900 | 8/11 | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| A. B. Williams | 1900 | no g. | Norwich Witches | Connecticut State League | Norwich, CT | ||
| Bill Williams | 1900 | Genuine Cuban Giants | Independent | Genuine, | |||
| Clare Williams | willia007cla | 1900 | +8/26+ | 29 g. | Butte Smoke Eaters | Montana State League | Butte, MT |
| Clare Williams | willia007cla | 1900 | Anaconda Serpents | Montana State League | Anaconda, MT | ||
| Clarence Williams | willia010cla | 1900 | Cuban X Giants | Black Baseball League | Cuban, | ||
| Clarence Williams | willia010cla | 1900 | Cuban Giants | Black Baseball | , | ||
| Dal Williams | willia012--- | 1900 | +5/15-6/8 | Anderson | Indiana State League | Anderson, IN | |
| Dal Williams | willia001lev | 1900 | 6/18-7/6 | New Castle Quakers | Interstate League | New Castle, PA | |
| Dal Williams | willia001lev | 1900 | 9/10-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Dave Williams | willia013dav | 1900 | 6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Gene Williams | willia002gen | 1900 | 2 g. | Azusa | Southern California League | Azusa, CA | |
| Jimmy Williams | willia025jam | 1900 | 4/19-10/13 | 106 g. | Pittsburgh | National League | Pittsburgh, PA |
| Pop Williams | willia008wal | 1900 | 4/30-9/22 | Toronto Canucks | Eastern League | Toronto, ON | |
| Robert Williams | willia028rob | 1900 | 1 g. | Stockton Wasps | California League | Stockton, CA | |
| Tom Williams | willia004tom | 1900 | 6/17-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Tom Williams | willia004tom | 1900 | 8/24-9/16 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Willis | 1900 | 14 g. | Visalia | San Joaquin | Visalia, CA | ||
| Delaware Willis | willis001del | 1900 | +5/5+ | Newark DE | Independent | Newark, DE | |
| Vic Willis | willis001vic | 1900 | 4/19-10/11 | 32 g. | Boston | National League | Boston, MA |
| Charles Wills | wills-001cha | 1900 | +6/8 | Wabash | Indiana State League | Wabash, IN | |
| Dave Wills | wills-001dav | 1900 | 6/28-8/4 | Wilmington | North Carolina Association | Wilmington, NC | |
| Walt Wilmot | wilmot001wal | 1900 | 4/19-9/18 | Minneapolis Millers | American League | Minneapolis, MN | |
| Robert Wilner | willne001rob | 1900 | Spokane AC | Independent | Spokane, WA | ||
| Wilson | wilson007--- | 1900 | 5/10-5/18 | Chatham Reds | International League | Chatham, ON | |
| Wilson | wilson029--- | 1900 | 4/28-5/9 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Wilson | wilson097--- | 1900 | 7/24 | Des Moines Hawkeyes | Western League | Des Moines, IA | |
| Baldy Wilson | 1900 | Phil.-Crescents | Independent | Philadelphia, PA | |||
| Bill Wilson | wilson003bil | 1900 | 5/5-8/29 | Omaha Omahogs | Western League | Omaha, NE | |
| Ed Wilson | 1900 | Cuban X Giants | Independent | Cuban, | |||
| Ed Wilson | wilson001ed- | 1900 | Cuban Giants | Black Baseball | , | ||
| F. Wilson | wilson004f-- | 1900 | 1 g. | Azusa | Southern California League | Azusa, CA | |
| Frank Wilson | wilson004fra | 1900 | Ut-Id | , | |||
| Gary Wilson | wilson010jam | 1900 | 5/9-6/14 | Meriden Silverites | Connecticut State League | Meriden, CT | |
| Gary Wilson | wilson010jam | 1900 | 6/15-6/22+ | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| George Wilson | wilson019geo | 1900 | Chicago Columbia Giants | Black Baseball League | Chicago, IL | ||
| Harry Wilson | wilson003hen | 1900 | 5/9-6/22+ | Bristol Bellmakers | Connecticut State League | Bristol, CT | |
| Harry Wilson | wilson003hen | 1900 | 6/26-7/16 | Waterbury Rough Riders | Connecticut State League | Waterbury, CT | |
| Harry Wilson | wilson003hen | 1900 | 7/20-8/8 | New London Whalers | Connecticut State League | New London, CT | |
| Harry Wilson | wilson003hen | 1900 | 8/10-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Harry Wilson | wilson008har | 1900 | Springfield/Jacksonville | Central League | Springfield, IL | ||
| Harry Wilson | wilson003hen | 1900 | New London Whalers | Connecticut State League | New London, CT | ||
| Howard Wilson | wilson001how | 1900 | 5/10-8/15+ | Norwich Witches | Connecticut State League | Norwich, CT | |
| Ken Wilson | wilson004ken | 1900 | Marion Glass Blowers | Indiana State League | Marion, IN | ||
| Parke Wilson | wilson001par | 1900 | 5/16-7/10 | Kansas City Blues | American League | Kansas City, MO | |
| Ray Wilson | wilson003ray | 1900 | Cuban X Giants | Black Baseball | , | ||
| W.J. Wilson | wilson005w-- | 1900 | 3 g. | Los Angeles | Southern California League | Los Angeles, CA | |
| Willie Wilson | wilson026wil | 1900 | 5/11-5/21+ | Albany Senators | New York State League | Albany, NY | |
| Willie Wilson | wilson026wil | 1900 | 6/18-7/2 | St. Joseph Saints | Western League | St. Joseph, MO | |
| Willie Wilson | wilson026wil | 1900 | 7/4-7/18 | Pueblo Indians | Western League | Pueblo, CO | |
| Zeke Wilson | wilson002zek | 1900 | 4/21-6/1 | Cleveland Lake Shores | American League | Cleveland, OH | |
| Lewis Wiltse | wiltse001lew | 1900 | 4/30-5/13 | Toledo Mud Hens | Interstate League | Toledo, OH | |
| Lewis Wiltse | wiltse001lew | 1900 | 5/22-9/19 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Lave Winham | winham001laf | 1900 | 7/17-8/4 | Statesville | North Carolina Association | Statesville, NC | |
| Dicey Winston | winsto006--- | 1900 | 7/10-7/11+ | Durham Bulls | North Carolina Association | Durham, NC | |
| George Winter | winter001geo | 1900 | Myerstown-All Collegiates | Amateur | Myerstown, | ||
| George Winter | winter001geo | 1900 | Manheim PA | Independent | Manheim, PA | ||
| George Winter | winter001geo | 1900 | Gettysburg | Independent | Gettysburg, PA | ||
| George Winters | winter002geo | 1900 | no g. | Montreal Royals | Eastern League | Montreal, QC | |
| George Winters | winter002geo | 1900 | Troy Washerwomen | New York State League | Troy, NY | ||
| Doc Wiseman | wisema001jul | 1900 | , | ||||
| George Witbeck | witbec001geo | 1900 | Union College | College | , | ||
| George Witbeck | witbec001geo | 1900 | Morovia | Independent | Morovia, NY | ||
| Bill Wittrock | whitro001bil | 1900 | 5/3-5/8 | Jersey City City | Atlantic League | Jersey City, NJ | |
| Bill Wittrock | whitro001bil | 1900 | 6/4-6/11 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Harrisburg, PA | |
| Bill Wittrock | whitro001bil | 1900 | 7/27-8/22 | Derby Angels | Connecticut State League | Derby, CT | |
| Boodie Wolf | wolf--001boo | 1900 | 5/11-6/24 | Grand Rapids Boers | International League | Grand Rapids, MI | |
| Boodie Wolf | wolf--001boo | 1900 | 6/27-7/4 | Saginaw Salt Eaters | International League | Saginaw, MI | |
| Denny Wolf | 1900 | Brunswick | Independent | Brunswick, GA | |||
| Wolfe | wolfe-002--- | 1900 | 10 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Barney Wolfe | wolfe-001wil | 1900 | 4/28-8/21 | Columbus Senators/Anderson Anders | Interstate League | Columbus, OH | |
| Barney Wolfe | wolfe-001wil | 1900 | 8/26-9/15 | Columbus Senators/Anderson Anders | Interstate League | Anderson, IN | |
| Maurice Wolfe | wolfe-001mau | 1900 | 7/11-9/5 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Orville Wolfe | 1900 | Newark OH | Independent | Newark, OH | |||
| Harry Wolverton | wolver001har | 1900 | 4/19-4/22 | 3 g. | Chicago | National League | Chicago, IL |
| Harry Wolverton | wolver001har | 1900 | 4/30-10/13 | 101 g. | Philadelphia | National League | Philadelphia, PA |
| Wood | wood--024--- | 1900 | 6/5-6/7 | Sioux City Cornhuskers | Western League | Sioux City, IA | |
| Wood | wood--009--- | 1900 | 7/9-7/10 | Hampton Crabs | Virginia League | Hampton, VA | |
| Bob Wood | wood--005rob | 1900 | 4/22-7/25 | 45 g. | Cincinnati | National League | Cincinnati, OH |
| Bob Wood | wood--005rob | 1900 | 8/16-9/18 | Chicago White Stockings | American League | Chicago, IL | |
| Carl Wood | wood--001car | 1900 | 5/22- | 34 g. | Helena Senators | Montana State League | Helena, MT |
| Mike Woodlock | woodlo001mic | 1900 | 5/11-9/8 | Utica Reds | New York State League | Utica, NY | |
| Elmer Woodmansee | woodma000elm | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Pete Woodruff | woodru002pet | 1900 | 5/10-9/8 | New London Whalers | Connecticut State League | New London, CT | |
| Sam Woodruff | woodru001orv | 1900 | 5/12-9/8 | Binghamton Crickets | New York State League | Binghamton, NY | |
| Woods | woods-022--- | 1900 | 1 g. | Los Angeles-Pacific | Southern California League | Los Angeles, CA | |
| Walt Woods | woods-002wal | 1900 | 4/27 | 1 g. | Pittsburgh | National League | Pittsburgh, PA |
| Walt Woods | woods-002wal | 1900 | 5/19-9/22 | Springfield Ponies/Maroons | Eastern League | Springfield, MA | |
| C.F. Woodworth | woodwo002c-- | 1900 | Tufts University | College | , | ||
| C.F. Woodworth | woodwo002c-- | 1900 | 5/12-9/8 | Norwich Witches | Connecticut State League | Norwich, CT | |
| Wooley | 1900 | 1 g. | SoCalif | , | |||
| Wooley | wooley001--- | 1900 | Los Angeles-Pacific | Southern California League | Los Angeles, CA | ||
| G.A. Woolford | woolfo001g-- | 1900 | 12 g. | Springfield/Jacksonville | Central League | Springfield, IL | |
| G.A. Woolford | woolfo001g-- | 1900 | Springfield/Jacksonville | Central League | Jacksonville, IL | ||
| Frank Wooliver | wooliv001fra | 1900 | Webb City | Independent | Webb City, MO | ||
| Lloyd Wooten | wooten000llo | 1900 | +8/9+ | Kingston NC | Independent | Kingston, NC | |
| Lloyd Wooten | wooten000llo | 1900 | +8/17+ | LaGrange NC | Independent | LaGrange, NC | |
| Tom Works | works-001tom | 1900 | 4 g. | San Diego | Southern California League | San Diego, CA | |
| Gene Wright | wright003eug | 1900 | 5/9-6/11 | Dayton Veterans | Interstate League | Dayton, OH | |
| Gene Wright | wright001cla | 1900 | -9/23 | 33 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Joe Wright | wright001joe | 1900 | 4/28-6/19 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | |
| Joe Wright | wright001joe | 1900 | 14 g. | Omaha Omahogs | Western League | Omaha, NE | |
| Lucky Wright | wright015wil | 1900 | Bowling Green | Independent | Bowling Green, OH | ||
| Pat Wright | wright003pat | 1900 | 4/28-8/25 | New Castle Quakers | Interstate League | New Castle, PA | |
| Pat Wright | wright003pat | 1900 | 9/5-9/16 | Marion Glass Blowers | Indiana State League | Marion, IN | |
| Pat Wright | wright003pat | 1900 | Youngstown Little Giants/Marion Glass Blowers | Interstate League | Youngstown, OH | ||
| Red Wright | wright001jos | 1900 | 88 g. | Danville Champions | Central League | Danville, IL | |
| Zeke Wrigley | wrigle001zek | 1900 | 4/26-8/16 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Zeke Wrigley | wrigle001zek | 1900 | 8/17-9/21 | Worcester Farmers | Eastern League | Worcester, MA | |
| W. Wyland | wyland000w-- | 1900 | Muncie | Indiana State League | Muncie, IN | ||
| Wynch | wynch-001--- | 1900 | 7/22 | Cortland Wagonmakers | New York State League | Cortland, NY | |
| Will Wynne | wynne-002bil | 1900 | +7/6-7/7+ | Raleigh Senators | North Carolina Association | Raleigh, NC | |
| Will Wynne | wynne-002bil | 1900 | +7/1+ | Umpire | North Carolina Association | , | |
| William Wynne | wynne-001wil | 1900 | +7/17+ | Rale.-Brownies | Independent | Raleigh, NC | |
| Ad Yale | yale--001wil | 1900 | 5/6-9/10 | Bridgeport Orators | Connecticut State League | Bridgeport, CT | |
| Hogan Yancey | yancey001hog | 1900 | Va. Military Inst. | College | , | ||
| Hogan Yancey | yancey001hog | 1900 | 6/25- | Statesville | North Carolina Association | Statesville, NC | |
| Hogan Yancey | yancey001hog | 1900 | +7/17+ | Yorkville SC | Independent | Yorkville, SC | |
| George Yeager | yeager001geo | 1900 | 4/26-5/26 | Milwaukee Brewers | American League | Milwaukee, WI | |
| Joe Yeager | yeager002jos | 1900 | 4/20 | 3 g. | Brooklyn | National League | Brooklyn, NY |
| Joe Yeager | yeager002jos | 1900 | 4/30-9/13 | Detroit Tigers | American League | Detroit, MI | |
| Joe Yeager | yeager002jos | 1900 | 10/3-10/12 | 3 g. | Brooklyn | National League | Brooklyn, NY |
| Stan Yerkes | yerkes001sta | 1900 | 5/29-6/6 | Omaha Omahogs | Western League | Omaha, NE | |
| Stan Yerkes | yerkes001sta | 1900 | 6/15-9/1 | Pueblo Indians | Western League | Pueblo, CO | |
| Joseph Yessler | 1900 | College | , | ||||
| Cecil Young | young-001cec | 1900-01 | U. of Alabama | College | , | ||
| Charles Young | young-002cha | 1900 | 5/12-8/28 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Cy Young | young-001den | 1900 | 4/19-10/7 | 41 g. | St. Louis | National League | St. Louis, MO |
| Elmer Young | young-001elm | 1900 | 4/30-5/31 | Reading Coal Heavers | Atlantic League | Reading, PA | |
| Elmer Young | young-001elm | 1900 | Norristown | Independent | Norristown, PA | ||
| Charles Younger | younge000cha | 1900 | Anderson | Indiana State League | Anderson, IN | ||
| Jack Zalusky | zalusk001joh | 1900-01 | U. of Minneasota | College | , | ||
| Dave Zearfoss | zearfo001dav | 1900 | 4/28-5/4 | Toronto Canucks | Eastern League | Toronto, ON | |
| Dave Zearfoss | zearfo001dav | 1900 | 5/10-5/26 | Newark Colts | Atlantic League | Newark, NJ | |
| Dave Zearfoss | zearfo001dav | 1900 | -9/23 | 64 g. | Great Falls Indians | Montana State League | Great Falls, MT |
| Zepley | zepley001--- | 1900 | 8/20 | Fort Wayne Indians | Interstate League | Fort Wayne, IN | |
| Zieber | zieber001--- | 1900 | +4/28+ | Reading Browns | Independent | Reading, PA | |
| Charlie Ziegler | ziegle001cha | 1900 | 4/30-5/26 | Philadelphia Athletics/Harrisburg Ponies | Atlantic League | Philadelphia, PA | |
| Charlie Ziegler | ziegle001cha | 1900 | 6/4-6/6 | 3 g. | Philadelphia | National League | Philadelphia, PA |
| Charlie Ziegler | ziegle001cha | 1900 | 6/19 | Syracuse Stars | Eastern League | Syracuse, NY | |
| Charlie Ziegler | ziegle001cha | 1900 | -8/21 | 58 g. | Albany Senators | New York State League | Albany, NY |
| Charles Zietz | zietz-001cha | 1900 | 5/5 | Denver Grizzlies | Western League | Denver, CO | |
| Charles Zietz | zietz-001cha | 1900 | 31 g. | St. Joseph Saints | Western League | St. Joseph, MO | |
| Charles Zimmer | zimmer001cha | 1900 | 4/19-10/11 | 82 g. | Pittsburgh | National League | Pittsburgh, PA |
| Bill Zink | zink--001wil | 1900 | 36 g. | Terre Haute Hottentots | Central League | Terre Haute, IN | |
| Bill Zink | zink--001wil | 1900 | 8/23-8/26 | Omaha Omahogs | Western League | Omaha, NE | |
| Eddie Zinram | zinram001edw | 1900 | Greenville | Independent | Greenville, PA | ||
| Charles Zinzer | zinzer001cha | 1900 | 5/11-9/8 | Schenectady Electricians | New York State League | Schenectady, NY | |
| Jose Zubillaga | zubill000jos | 1900 | Habana | Cuban League | , |