exactmatch =
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There are 3865 matches found
| Name | BBrefID | Year | Span | Games | Team | League | Location |
| Bert Abbey | abbey-001ber | 1888-91 | Univ. of Vermont | College | , | ||
| Charlie Abbey | abbey-001cha | 1888 | Beatrice | Independent | Beatrice, NE | ||
| Abbott | abbott001--- | 1888 | 9/3-9/5 | Albany Governors | International Association | Albany, NY | |
| Dan Abbott | abbott001dan | 1888 | no g. | Peoria Reds | Central Interstate League | Peoria, IL | |
| L.F. Abbott | abbott001f-- | 1888 | 4/28-6/5 | Danbury | Connecticut State League | Danbury, CT | |
| L.F. Abbott | abbott001f-- | 1888 | 6/-6/21 | Easton | Central League | Easton, PA | |
| C.A. Adams | adams-000ca- | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Arthur Agan | agan--001art | 1888 | 5/11-5/24 | Rochester Jingoes | International Association | Rochester, NY | |
| Arthur Agan | agan--001art | 1888 | 5/30-8/6 | Watertown | Eastern International League | Watertown, NY | |
| Arthur Agan | agan--001art | 1888 | 11 g. | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Tom Ahern | ahern-000tom | 1888 | 7 g. | Sacramento | California State League | Sacramento, CA | |
| Gus Alberts | albert001gus | 1888 | 5/8 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Gus Alberts | albert001gus | 1888 | 102 g. | Cleveland | American Association | Cleveland, OH | |
| Charles Alcott | alcott001cha | 1888 | 5/3-5/6 | 2 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Charles Alcott | alcott001cha | 1888 | 5/30 | Camden | PhilReg | Camden, NJ | |
| Charles Alcott | alcott001cha | 1888 | 6/2-8/7 | Mansfield | Tri-State League | Mansfield, OH | |
| Charles Alcott | alcott001cha | 1888 | 8/14-9/3 | London Tecumsehs | International Association | London, ON | |
| Charles Alcott | alcott001cha | 1888 | 9/18-9/19 | Albany Governors | International Association | Albany, NY | |
| B.G. Aldrich | aldric001b-- | 1888 | 4/23-8/28 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Dan Alexander | alexan001dan | 1888 | New Castle | Independent | New Castle, PA | ||
| Allen | allen-035--- | 1888 | 4/28-6/16 | Easton | Central League | Easton, PA | |
| Allen | 1888 | +6/4-6/13 | Watertown | Eastern International League | Watertown, NY | ||
| Allen | allen-103--- | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Bob Allen | allen-001bob | 1888 | 4/23-7/13 | Mansfield | Tri-State League | Mansfield, OH | |
| Edward Allen | allen-004edw | 1888 | 4/23-5/13 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Edward Allen | allen-004edw | 1888 | 6/12-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Frank Allen | 1888 | Hutchinson | Western League | Hutchinson, KS | |||
| James Allen | allen-015jam | 1888 | 7/6 | 1 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Myron Allen | allen-001myr | 1888 | -7/1 | 37 g. | Kansas City | American Association | Kansas City, MO |
| Myron Allen | allen-001myr | 1888 | 8/2-9/19 | Albany Governors | International Association | Albany, NY | |
| William Allen | allen-013wil | 1888 | 5/1-6/25 | Rockford | Central Interstate League | Rockford, IL | |
| William? Allen | 1888 | no g. | Oswego | Eastern International League | Oswego, NY | ||
| James Allison | alliso005jam | 1888 | no g. | Elmira | Central League | Elmira, NY | |
| David Allman | allman001dav | 1888 | Waterbury | Connecticut State League | Waterbury, CT | ||
| Alloway | allowa003--- | 1888 | 7/31-8/1 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Billy Alvord | alvord001bil | 1888 | 4/28-10/9 | 112 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| George Ammons | ammons001geo | 1888 | Vicksburg | Independent | Vicksburg, MS | ||
| Anderson | 1888 | Chester | Independent | Chester, PA | |||
| Varney Anderson | anders001var | 1888 | 5/4-8/3 | 17 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Varney Anderson | anders001var | 1888 | 8/17-8/18 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Varney Anderson | anders001var | 1888 | 9/1- | 14 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| Andrews | andrew054--- | 1888 | +6/8+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Ed Andrews | andrew001ed- | 1888 | 124 g. | Philadelphia | National League | Philadelphia, PA | |
| W.M. Andrews | andrew001w-- | 1888 | Moberly | Semi-Pro | Moberly, MO | ||
| Wally Andrews | andrew002wal | 1888 | 4/7-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Wally Andrews | andrew002wal | 1888 | -8/8 | 26 g. | Louisville | American Association | Louisville, KY |
| Wyman Andrus | andrus001wym | 1888 | 4/28-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| Louis Angevine | angevi001lou | 1888 | -7/8 | Rochester Danfords | Independent | Rochester, NY | |
| Louis Angevine | angevi001lou | 1888 | 7/13- | 9 g. | Penn Yan | Central New York League | Penn Yan, NY |
| H. Annear | 1888 | no g. | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | ||
| H. Annear | 1888 | 6/2-6/7 | Oswego | Eastern International League | Oswego, NY | ||
| Bill Annis | annis-001bil | 1888 | 4/30-10/7 | 121 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Cap Anson | anson-001cap | 1888 | 134 g. | Chicago | National League | Chicago, IL | |
| Joseph Anthony | anthon003jos | 1888 | 5/19-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Louis? Applegate | 1888 | 4/16- | Covington | Independent | Covington, KY | ||
| Arcan | 1888 | 6 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Joe Ardner | ardner001joe | 1888 | 5/1-10/9 | 82 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Frank Armstrong | armstr001fra | 1888 | Media Acad | Independent | Media, PA | ||
| Frank Arnold | arnold001fra | 1888 | 7/-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Charles Arthur | 1888 | no g. | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | ||
| Joseph Arthur | 1888 | no g. | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | ||
| Tug Arundel | arunde001tug | 1888 | 5/8-6/20 | 17 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Tug Arundel | arunde001tug | 1888 | - 9/27 | 17 g. | Washington | National League | Washington, DC |
| Atkinson | 1888 | Peterboro | Independent | Peterboro, ON | |||
| Atkinson | 1888 | +6/29-7/2+ | Kingston | Eastern International League | Kingston, ON | ||
| Al Atkinson | atkins001al- | 1888 | 4/28-9/1+ | Toronto Canucks | International Association | Toronto, ON | |
| William Avery | avery-002wil | 1888 | 5/10-6/14 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| William Avery | avery-002wil | 1888 | 7/18-7/21 | Chester Houston | PhilReg | Chester, PA | |
| Jake Aydelott | aydelo001jak | 1888 | +6/14+ | Marion | Indiana State League | Marion, IN | |
| Jake Aydelott | aydelo001jak | 1888 | South Bend | Indiana State League | South Bend, IN | ||
| George Backer | backer001geo | 1888 | 4/24-8/26 | Columbus Senators | Tri-State League | Columbus, OH | |
| Herman Bader | bader-001her | 1888 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | ||
| Herman Bader | bader-001her | 1888 | 7/4-7/19 | 14 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Bailey | bailey001--- | 1888 | 6/6-7/13 | Mansfield | Tri-State League | Mansfield, OH | |
| Timothy Bailey | bailey003tim | 1888 | KSSt | , | |||
| Billy Baker | baker-014wil | 1888 | Hamilton Hams | International Association | Hamilton, ON | ||
| Billy Baker | baker-014wil | 1888 | +6/1-7/30 | Belleville | Eastern International League | Belleville, NJ | |
| Billy Baker | baker-014wil | 1888 | +8/11-8/14 | Brockville | Eastern International League | Brockville, ON | |
| Lewis Baker | baker-001lew | 1888 | 4/28-8/14 | Allentown Peanuts | Central League | Allentown, PA | |
| Norm Baker | baker-001nor | 1888 | 4/28-9/28 | Newark Trunkmakers | Central League | Newark, NJ | |
| Norm Baker | baker-001nor | 1888 | 11 g. | Stockton | California League | Stockton, CA | |
| Pete Baker | baker-001pet | 1888 | Albany Governors | International Association | Albany, NY | ||
| Phil Baker | baker-002phi | 1888 | 4/28-8/25 | Troy Trojans | International Association | Troy, NY | |
| Jersey Bakley | bakely001jer | 1888 | - 8/20 | 61 g. | Cleveland | American Association | Cleveland, OH |
| Kid Baldwin | baldwi001kid | 1888 | 67 g. | Cincinnati | American Association | Cincinnati, OH | |
| Lady Baldwin | baldwi001lad | 1888 | 6 g. | Detroit | National League | Detroit, MI | |
| Leonard Baldwin | baldwi001leo | 1888 | 4/28-? | Binghamton Crickets | Central League | Binghamton, NY | |
| Mark Baldwin | baldwi001mar | 1888 | 30 g. | Chicago | National League | Chicago, IL | |
| Walter Baldwin | baldwi001wal | 1888 | 4/8-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Walter Baldwin | baldwi001wal | 1888 | 6/21-7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Frank Bancroft | bancro001fra | 1888 | New Bedford | Independent | New Bedford, MA | ||
| Jim Banning | bannin001jim | 1888 | 5/21-9/18 | Troy Trojans | International Association | Troy, NY | |
| Jim Banning | bannin001jim | 1888 | 9/27 | 1 g. | Washington | National League | Washington, DC |
| Barclay | 1888 | -9/16 | New Castle | IntSt | New Castle, PA | ||
| Bardeen | 1888 | 1 g. | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Sam Barkley | barkle001sam | 1888 | 116 g. | Kansas City | American Association | Kansas City, MO | |
| Barnes | 1888 | Chester | Independent | Chester, PA | |||
| Barnes | barnes040--- | 1888 | 7/26 | 1 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Bill Barnes | barnes001bil | 1888 | Indianapolis Shamrocks | Independent | Indianapolis, IN | ||
| Doug Barnes | barnes001dou | 1888 | 5/2- | 21 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN |
| Hugh Barnes | 1888 | Indianapolis Shamrocks | Independent | Indianapolis, IN | |||
| John Barnes | barnes003joh | 1888 | St. Paul Apostles | Western Association | St. Paul, MN | ||
| William Barnett | barnet001--- | 1888 | 7 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| William Barnett | barnet001--- | 1888 | 6/14-6/26+ | Elkhart | Indiana State League | Elkhart, IN | |
| Albert Barney | barney001alb | 1888 | 4/24-5/13 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Albert Barney | barney001alb | 1888 | Nashua | New England Interstate League | Nashua, NH | ||
| James Barnfather | barnfa001jam | 1888 | South Bend | Independent | South Bend, IN | ||
| Billy Barnie | barnie001bil | 1888 | Baltimore | American Association | Baltimore, MD | ||
| Bob Barr | barr--001bob | 1888 | 4/30-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Harry Barrett | 1888 | 6/30-9/15 | Penn Yan | Central New York League | Penn Yan, NY | ||
| Thomas Barrett | barret004tho | 1888 | 5/2-8/27 | Allentown Peanuts | Central League | Allentown, PA | |
| Tommy Barrett | barret019--- | 1888 | 8/24 | 1 g. | Chicago Maroons | Western Association | Chicago, IL |
| Romeo Barry | barry-001rom | 1888 | 6 g. | Sacramento | California State League | Sacramento, CA | |
| Dick Bartell | bartel001dic | 1888 | 11 g. | Chicago Spaldings | ChicComm | Chicago, IL | |
| Bartlett | 1888 | 5/30-6/9 | Waterbury | Connecticut State League | Waterbury, CT | ||
| Charlie Bartson | bartso001cha | 1888 | 5/1- | 30 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| Charlie Bartson | bartso001cha | 1888 | 8/16-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Charley Bassett | basset001cha | 1888 | 128 g. | Indianapolis | National League | Indianapolis, IN | |
| Charlie Bastian | bastia001cha | 1888 | 80 g. | Philadelphia | National League | Philadelphia, PA | |
| Bates | 1888 | Harvard Univ. | College | , | |||
| Bates | 1888 | Staten Island | Amat | Staten Island, NY | |||
| Bates | bates-033--- | 1888 | +7/4-8/2+ | South Bend | Indiana State League | South Bend, IN | |
| Bates | bates-034--- | 1888 | 8/2+ | South Bend | Indiana State League | South Bend, IN | |
| John Bates | bates-004joh | 1888 | 3/30-5/4 | Galveston Giants | Texas League | Galveston, TX | |
| John Bates | bates-004joh | 1888 | 12 g. | Rockford | Central Interstate League | Rockford, IL | |
| Sam Bates | bates-001sam | 1888 | 5/2- | 33 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN |
| Joe Battin | battin001joe | 1888 | 4/28-9/19+ | Syracuse Stars | International Association | Syracuse, NY | |
| Al Bauer | bauer-001al- | 1888 | 5/6;8/8-9/23 | Umpire | TriSt | , | |
| Harry Baumgardner | baumga002har | 1888 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | ||
| A. Baumgartner | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | |||
| George Bausewine | bausew003geo | 1888 | 4/23-8/14 | Canton Nadjys | Tri-State League | Canton, OH | |
| Frank Baxter | baxter001fra | 1888 | 6/20-8/13 | Chester Houston | PhilReg | Chester, PA | |
| James Baxter | baxter004jam | 1888 | Dover | New England Interstate League | Dover, DE | ||
| D. L. Baylor | bailor001dav | 1888 | Sedalia | Independent | Sedalia, KS | ||
| Dave Beadle | beadle001dav | 1888 | 4/28-5/5 | Elmira | Central League | Elmira, NY | |
| Dave Beadle | beadle001dav | 1888 | 5/30- | 25 g. | Decatur | Central Interstate League | Decatur, IL |
| Dave Beadle | beadle001dav | 1888 | Bloomington Reds | Central Interstate League | Bloomington, IL | ||
| Ollie Beard | beard-001oll | 1888 | 4/28-9/19 | Syracuse Stars | International Association | Syracuse, NY | |
| Ed Beatin | beatin001ed- | 1888 | -9/14 | 16 g. | Detroit | National League | Detroit, MI |
| Becannan | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Buck Becannon | becann001buc | 1888 | 4/28-8/15 | Easton | Central League | Easton, PA | |
| William Beck | beck--002wil | 1888 | 4/24-6/30 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Jake Beckley | beckle001jac | 1888 | 4/28-6/19 | 38 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Jake Beckley | beckle001jac | 1888 | 6/20- | 71 g. | Pittsburgh | National League | Pittsburgh, PA |
| Beebe | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Walter Beebe | beebe-001wal | 1888 | Bergen Point | Idep | Bergen Point, NJ | ||
| Walter Beebe | beebe-001wal | 1888 | 7/7 | Albany Governors | International Association | Albany, NY | |
| Ed Beecher | beeche001ed- | 1888 | 4/28-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Philip Begy | begy--001phi | 1888 | 7 g. | Penn Yan | Central New York League | Penn Yan, NY | |
| Philip Begy | begy--001phi | 1888 | +6/4-8/6 | Watertown | Eastern International League | Watertown, NY | |
| James Behan | behan-001jam | 1888 | 4/28-6/8 | Lynn Shoemakers | New England League | Lynn, MA | |
| James Behan | behan-001jam | 1888 | 6/18-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| James Behan | behan-001jam | 1888 | 7/12-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Steve Behel | behel-001ste | 1888 | 5/3- | 31 g. | Rockford | Central Interstate League | Rockford, IL |
| Frank Behne | behne-001fra | 1888 | +5/19+ | Lincoln Tree Planters | Western League | Lincoln, NE | |
| Frank Behne | behne-001fra | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | ||
| Beisack | beisac001--- | 1888 | +5/19- | Lincoln Tree Planters | Western League | Lincoln, NE | |
| Bell | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Jack Bellman | bellma001jac | 1888 | 17 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Bemis | bemis-002--- | 1888 | 7/20 | Salem Witches | New England League | Salem, MA | |
| Benedict | 1888 | 2 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Charlie Bennett | bennet005cha | 1888 | 74 g. | Detroit | National League | Detroit, MI | |
| Eddie Bennett | bennet001edd | 1888 | 3 g. | San Francisco Haverlys | California League | San Francisco, CA | |
| J. Bennett | bennet006j-- | 1888 | Frankfort | Indiana State League | Frankfort, IN | ||
| J.M. Bennett | bennet005j-- | 1888 | Minneapolis Millers | Western Association | Minneapolis, MN | ||
| S. Bennett | bennet000s-- | 1888 | +6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| W.F. Bent | bent--001w-- | 1888 | 25 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| George Bentel | bentel001geo | 1888 | 3/29- | 8 g. | Stockton | California League | Stockton, CA |
| Tun Berger | berger001tun | 1888 | 4/23-8/7 | Mansfield | Tri-State League | Mansfield, OH | |
| Martin Berkery | berker002mar | 1888 | Houston | Independent | Houston, TX | ||
| Bernard | bernar003--- | 1888 | 10/7 | 2 g. | Chicago Maroons | Western Association | Chicago, IL |
| Bob Berryhill | berryh001rob | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| Best | 1888 | Yonkers | HudRiv | Yonkers, | |||
| Daniel Bettus | bettus001dan | 1888 | 4/8-4/16 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| William Betz | betz--001wil | 1888 | Chester | Independent | Chester, PA | ||
| Bidwell | 1888 | 7 g. | Sacramento | California State League | Sacramento, CA | ||
| Charles Bierbauer | bierba001cha | 1888 | Erie Drummers | Independent | Erie, PA | ||
| Lou Bierbauer | bierba002lou | 1888 | 134 g. | Philadelphia | American Association | Philadelphia, PA | |
| Isaac Bingham | bingha001isa | 1888 | St. Paul Apostles | Western Association | St. Paul, MN | ||
| Isaac Bingham | bingha001isa | 1888 | 4/28-8/2 | Salem Witches | New England League | Salem, MA | |
| Isaac Bingham | bingha001isa | 1888 | 8/20-9/29 | Easton | Central League | Easton, PA | |
| Bird | bird--001--- | 1888 | 5/19-6/30 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Bishop | bishop020--- | 1888 | +7/26+ | Logansport | Indiana State League | Logansport, IN | |
| Biddy Bishop | bishop001bid | 1888 | 7/10-7/19 | Mansfield | Tri-State League | Mansfield, OH | |
| Bill Bishop | bishop002bil | 1888 | 4/28-8/1 | London Tecumsehs | International Association | London, ON | |
| Bill Bishop | bishop002bil | 1888 | 8/16-9/21 | Syracuse Stars | International Association | Syracuse, NY | |
| Frank Bishop | bishop001fra | 1888 | 5/2- | 35 g. | Dubuque | Central Interstate League | Dubuque, IA |
| Samuel Bittle | bittle001sam | 1888 | 4/28-6/26 | Easton | Central League | Easton, PA | |
| Samuel Bittle | bittle001sam | 1888 | +8/11-8/14 | Brockville | Eastern International League | Brockville, ON | |
| Red Bittmann | bittma001red | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Red Bittmann | bittma001red | 1888 | 7/19-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Bob Black | black-002bob | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Bob Black | black-002bob | 1888 | 7/28-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Wilmer Black | black-006wil | 1888 | 5/5-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | |
| George Blackstock | blacks001geo | 1888 | 4/23-6/19 | Canton Nadjys | Tri-State League | Canton, OH | |
| Austin Blair | blair-001aus | 1888 | Elkhart | Indiana State League | Elkhart, IN | ||
| Austin Blair | blair-001aus | 1888 | 8/31-9/4 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Bill Blair | blair-001bil | 1888 | Philadelphia Reserves | Independent | Philadelphia, PA | ||
| Bill Blair | blair-001bil | 1888 | 7/19-9/23 | 4 g. | Philadelphia | American Association | Philadelphia, PA |
| Bob Blakiston | blakis001bob | 1888 | 4/8- | 38 g. | Stockton | California League | Stockton, CA |
| C.L. Blanchard | blanch008--- | 1888 | 6/11- | Newton | Western League | Newton, KS | |
| C.L. Blanchard | blanch001c-- | 1888 | 7/4-7/18 | 10 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Harvey Blauvelt | blauve001hen | 1888 | 16 g. | Waterloo | Central New York League | Waterloo, NY | |
| Ned Bligh | bligh-001ned | 1888 | 4/7-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Ned Bligh | bligh-001ned | 1888 | 7/11-7/28 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Ned Bligh | bligh-001ned | 1888 | 3 g. | Cincinnati | American Association | Cincinnati, OH | |
| Joseph Bohannon | bohann001jos | 1888 | 4/15-6/4 | Dallas Hams | Texas League | Dallas, TX | |
| Charlie Bohn | bohn--001cha | 1888 | 4/11-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Charlie Bohn | bohn--001cha | 1888 | 7/25-8/14 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Charlie Bohn | bohn--001cha | 1888 | 8/22-9/1 | Mansfield | Tri-State League | Mansfield, OH | |
| Tommy Bond | bond--001tom | 1888 | 4/28-7/2 | Umpire | So | , | |
| Frank Bonner | bonner001fra | 1888 | Providence | Independent | Providence, RI | ||
| Booth | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| George Borchers | borche001geo | 1888 | 3/31-5/6 | Oakland Greenhood & Morans | California League | Oakland, CA | |
| George Borchers | borche001geo | 1888 | 5/18- | 10 g. | Chicago | National League | Chicago, IL |
| George Borchers | borche001geo | 1888 | Westonville | Independent | Westonville, CA | ||
| Arthur Boseker | boseke000art | 1888 | +6/19-6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Billy Bottenus | botten001wil | 1888 | 4/23-6/15 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Billy Bottenus | botten001wil | 1888 | Logansport | Indiana State League | Logansport, IN | ||
| Billy Bottenus | botten001wil | 1888 | 7/14-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Joe Bourbeau | 1888 | Rochester Danfords | Independent | Rochester, NY | |||
| Joe Bourbeau | 1888 | 10 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Harry Bourquin | bourqu001har | 1888 | 5/1- | 56 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| Harry Bourquin | bourqu001har | 1888 | 9/25-9/30 | 5 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| S.S. Bowen | bowen-001s-- | 1888 | 12 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| S.S. Bowen | bowen-001s-- | 1888 | Lafayette | Indiana State League | Lafayette, IN | ||
| Thomas Bowen | bowen-001tho | 1888 | 4/28-5/7 | Elmira | Central League | Elmira, NY | |
| Thomas Bowen | bowen-001tho | 1888 | 6/20-7/4 | Oswego | Eastern International League | Oswego, NY | |
| Thomas Bowen | bowen-001tho | 1888 | 25 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| Frank Bowerman | bowerm001fra | 1888 | +5/26+ | Logansport | Indiana State League | Logansport, IN | |
| Cooney Bowers | bowers001coo | 1888 | 6/2-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Otho Bowers | bowers001o-- | 1888 | 5/19-7/4 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Bill Bowman | bowman001bil | 1888 | 5/7- | 15 g. | Rockford | Central Interstate League | Rockford, IL |
| Bill Bowman | bowman001bil | 1888 | 8/2+ | South Bend | Indiana State League | South Bend, IN | |
| Ben Boyd | boyd--001ben | 1888 | 6/7-10/2 | Cuban Giants | Independent | Cuban, | |
| C.N. Boyd | boyd--001--- | 1888 | 9 g. | Danville Browns | Central Interstate League | Danville, IL | |
| C.N. Boyd | boyd--001--- | 1888 | Chicago Maroons | Western Association | Chicago, IL | ||
| Boyle | 1888 | Chester | Independent | Chester, PA | |||
| Henry Boyle | boyle-001hen | 1888 | 37 g. | Indianapolis | National League | Indianapolis, IN | |
| Jack Boyle | boyle-001jac | 1888 | 71 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Jim Boyle | 1888 | 3 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| F. Bracken | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | |||
| George Brackett | bracke001geo | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Charles Bradley | bradle003cha | 1888 | 4/8-6/8 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Charles Bradley | bradle003cha | 1888 | 7/11-8/6 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| George Bradley | bradle002geo | 1888 | 4/7-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| George Bradley | bradle002geo | 1888 | 7/11-7/22 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| George Bradley | bradle002geo | 1888 | 8/8 | 1 g. | Baltimore | American Association | Baltimore, MD |
| Michael Bradley | bradle004mic | 1888 | 5/1-10/9 | 118 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Brady | brady-003--- | 1888 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | ||
| Charles Brady | brady-002cha | 1888 | 4/28-6/9 | Portland | New England League | Portland, ME | |
| Charles Brady | brady-002cha | 1888 | 2 g. | Nashua | New England Interstate League | Nashua, NH | |
| Charles Brady | brady-002cha | 1888 | 6/14-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| Jackson Brady | brady-002jac | 1888 | Umpire | Cent | , | ||
| Jackson Brady | brady-002jac | 1888 | Umpire | Int | , | ||
| Steve Brady | brady-002ste | 1888 | 4/28-9/26+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Thomas Braham | braham001tho | 1888 | Buffalo Travelers | Independent | Buffalo, NY | ||
| Thomas Braham | braham001tho | 1888 | Buffalo West Ends | Independent | Buffalo, NY | ||
| Brairton | 1888 | 4 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Howard Brandenburg | brande001how | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| Howard Brandenburg | brande001how | 1888 | +7/4-7/23+ | South Bend | Indiana State League | South Bend, IN | |
| Billy Bray | bray--002wil | 1888 | Grand Forks | Independent | Grand Forks, ND | ||
| Edwin Breckenridge | brecke002edw | 1888 | 20 g. | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Edwin Breckenridge | brecke002edw | 1888 | +5/26-7/27+ | Logansport | Indiana State League | Logansport, IN | |
| Edwin Breckenridge | brecke002edw | 1888 | 9/2-9/9 | Canton Nadjys | Tri-State League | Canton, OH | |
| Billy Brennan | brenna001w-- | 1888 | 5/30-7/4 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Billy Brennan | brenna001w-- | 1888 | 5/19-7/7 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Jack Brennan | brenna002jac | 1888 | 4/7-6/28 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Jack Brennan | brenna002jac | 1888 | - 10/4 | 34 g. | Kansas City | American Association | Kansas City, MO |
| James Brennan | brenna007jam | 1888 | 7/24-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| John Brennan | 1888 | 8/21-9/19+ | Umpire | Int | , | ||
| Brennon | brenno001--- | 1888 | 6/7-6/9 | Easton | Central League | Easton, PA | |
| O. S. Brenton | 1888 | no g. | Decatur | Central Interstate League | Decatur, IL | ||
| John Briel | briel-001joh | 1888 | 5/19-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| John Briel | briel-001joh | 1888 | 8/17-9/5 | Allentown Peanuts | Central League | Allentown, PA | |
| Charlie Briggs | briggs002cha | 1888 | 5/4- | 43 g. | Davenport | Central Interstate League | Davenport, IA |
| Charlie Briggs | briggs002cha | 1888 | 8/6-9/3 | Canton Nadjys | Tri-State League | Canton, OH | |
| Grant Briggs | briggs001gra | 1888 | 4/28-9/6 | Worcester Grays | New England League | Worcester, MA | |
| Bright | bright001--- | 1888 | 5/28-6/9 | Camden | PhilReg | Camden, NJ | |
| George Bright | bright001geo | 1888 | 4/20-5/5 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| George Bright | bright001geo | 1888 | 5/7-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| George Bright | bright001geo | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| George Bright | bright001geo | 1888 | 7/14-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| John Bright | 1888 | Ansonia Cuban Giants | CtSt | Ansonia, | |||
| Brill | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Frank Brill | brill-001fra | 1888 | 5/19-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| John Brill | 1888 | 7/11 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| John Brill | 1888 | 7/21-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | ||
| W.H. Brimblecomb | brimbl001w-- | 1888 | 5/1- | 27 g. | Danville Browns | Central Interstate League | Danville, IL |
| Fatty Briody | briody001fat | 1888 | 13 g. | Kansas City | American Association | Kansas City, MO | |
| Broadway | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Joseph Broderick | broder001jos | 1888 | +5/29+ | Lafayette | Indiana State League | Lafayette, IN | |
| Joseph Broderick | broder001jos | 1888 | 4 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Steve Brodie | brodie001wal | 1888 | 4/26-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| William Brooke | 1888 | 5/5-6/19 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| Henry Brooks | brooks002hen | 1888 | 5/5-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | |
| J. Brooks | 1888 | 5/5-7/7 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| W. Brooks | 1888 | 7/18-8/7 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Brophy | 1888 | 1 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Timothy Brosnan | brosna001tim | 1888 | 4/30-8/17 | 81 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Timothy Brosnan | brosna001tim | 1888 | 8/19-10/1 | 38 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Cal Broughton | brough001cal | 1888 | 4/21 | 1 g. | Detroit | National League | Detroit, MI |
| Cal Broughton | brough001cal | 1888 | 5/19-8/14 | 52 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Cal Broughton | brough001cal | 1888 | 8/16-10/4 | 43 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Dan Brouthers | brouth001den | 1888 | 129 g. | Detroit | National League | Detroit, MI | |
| Jim Brouthers | brouth001jam | 1888 | 4/23-5/11 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Jim Brouthers | brouth001jam | 1888 | +6/4-8/6 | Watertown | Eastern International League | Watertown, NY | |
| Brown | 1888 | 7/12 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Brown | 1888 | Chester | Independent | Chester, PA | |||
| Marshall Brown | brown-007mar | 1888 | 5/2-7/17 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Thomas Brown | 1888 | 7/17-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | ||
| Tom Brown | brown-012tho | 1888 | 107 g. | Boston | National League | Boston, MA | |
| Tom Brown | 1888 | Oswego | Eastern International League | Oswego, NY | |||
| William Brown | brown-027wil | 1888 | 20 g. | New York | National League | New York, NY | |
| William Brown | 1888 | Charleston Seagulls | Southern League | Charleston, SC | |||
| William Browner | browne003wil | 1888 | Santa Fe | NMSt | Santa Fe, NM | ||
| William Browner | browne003wil | 1888 | Las Cruces | NMSt | Las Cruces, | ||
| Pete Browning | browni001pet | 1888 | 99 g. | Louisville | American Association | Louisville, KY | |
| Brush | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Will Bryan | bryan-004wil | 1888 | Hutchinson | Western League | Hutchinson, KS | ||
| Will Bryan | bryan-004wil | 1888 | 7/13 | 1 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| George Bryant | bryant002geo | 1888 | 5/4-5/14 | Salem Witches | New England League | Salem, MA | |
| Tod Brynan | brynan001tod | 1888 | Chicago Reserves | Independent | Chicago, IL | ||
| Tod Brynan | brynan001tod | 1888 | 6/22- | 3 g. | Chicago | National League | Chicago, IL |
| Tod Brynan | brynan001tod | 1888 | 7/21-8/14 | 7 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Tod Brynan | brynan001tod | 1888 | 8/17-8/18 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| John Buchan | buchan003joh | 1888 | Las Vegas | Independent | Las Vegas, NV | ||
| Al Buckenberger | bucken001al- | 1888 | 5/15-5/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Dick Buckley | buckle001dic | 1888 | 4/20- | 71 g. | Indianapolis | National League | Indianapolis, IN |
| Tom Buckley | buckle001tom | 1888 | 3/29- | 66 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Charlie Buffinton | buffin001cha | 1888 | 46 g. | Philadelphia | National League | Philadelphia, PA | |
| Buick | buick-000--- | 1888 | 4 g. | San Francisco Emersons | California State League | San Francisco, CA | |
| Henry Buker | buker-001hen | 1888 | 8 g. | Chicago | ChicComm | Chicago, IL | |
| Bullen | bullen000--- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| George Burbridge | burbri002geo | 1888 | 4/28 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Ernie Burch | burch-001ern | 1888 | 4/28-6/20 | 39 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Roxy Burchard | burcha001g-- | 1888 | +6/19-6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Roxy Burchard | burcha001g-- | 1888 | 6/30-9/5 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Roxy Burchard | burcha001g-- | 1888 | Lafayette | Indiana State League | Lafayette, IN | ||
| Fred Burden | 1888 | 5/21-7/5 | Umpire | NE | , | ||
| Bill Burdick | burdic001bil | 1888 | 5/1-7/2 | 16 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Bill Burdick | burdic001bil | 1888 | 7/23- | 21 g. | Indianapolis | National League | Indianapolis, IN |
| Jack Burdock | burdoc001jac | 1888 | 22 g. | Boston | National League | Boston, MA | |
| Jack Burdock | burdoc001jac | 1888 | 70 g. | Brooklyn | American Association | Brooklyn, NY | |
| Jack Burdock | burdoc001jac | 1888 | New Haven | Independent | New Haven, CT | ||
| Burke | burke-054--- | 1888 | 9/19 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Burke | 1888 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |||
| Burke | 1888 | 4/30-8/16 | Easton | Central League | Easton, PA | ||
| Alex Burke | burke-000ale | 1888 | -7/9 | Rochester Ninth Ward Stars | Independent | Rochester, NY | |
| Alex Burke | burke-000ale | 1888 | 7/10- | 2 g. | Seneca Falls | Central New York League | Seneca Falls, NY |
| Dan Burke | burke-001dan | 1888 | 8/23-9/29 | Scranton Miners | Central League | Scranton, PA | |
| Eddie Burke | burke-002edd | 1888 | 4/28-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| John Burke | burke-008joh | 1888 | 4/28-8/3 | Salem Witches | New England League | Salem, MA | |
| John Burke | burke-008joh | 1888 | 8/18-9/29 | Easton | Central League | Easton, PA | |
| John Burke | burke-009joh | 1888 | 4/28-6/2 | Manchester Maroons | New England League | Manchester, NH | |
| John Burke | burke-009joh | 1888 | 7/4-7/22 | Lowell Chippies | New England League | Lowell, MA | |
| S. Burke | 1888 | 18 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| William Burke | burke-007wil | 1888 | +5/26- | 4 g. | Stockton | California League | Stockton, CA |
| Jesse Burkett | burket001jes | 1888 | 4/28-9/28 | Scranton Miners | Central League | Scranton, PA | |
| L. E. Burkett | 1888 | Troy Trojans | International Association | Troy, NY | |||
| Robert Burks | burks-001rob | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Robert Burks | burks-001rob | 1888 | 7/18-8/17 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Hercules Burnett | burnet003her | 1888 | 6/26 | 1 g. | Louisville | American Association | Louisville, KY |
| C.W. Burney | burney001c-- | 1888 | 4/7-4/30 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Walter Burnham | burnha002wal | 1888 | 4/27-9/10 | Worcester Grays | New England League | Worcester, MA | |
| Burns | 1888 | 3 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Burns | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Burns | burns-002--- | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | ||
| Bobby Burns | burns-002oli | 1888 | Nashua | New England Interstate League | Nashua, NH | ||
| Dick Burns | burns-001dic | 1888 | 4/28-9/29 | Scranton Miners | Central League | Scranton, PA | |
| F.R. Burns | burns-001f-- | 1888 | 4/7-4/8 | Dallas Hams | Texas League | Dallas, TX | |
| Henry Burns | burns-002hen | 1888 | 4/30-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| Jim Burns | burns-001jim | 1888 | 4/30-9/23 | 107 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Jim Burns | burns-001jim | 1888 | 9/25- | 15 g. | Kansas City | American Association | Kansas City, MO |
| John Burns | burns-015joh | 1888 | 5/8- | Hutchinson | Western League | Hutchinson, KS | |
| Thomas Burns | burns-001oys | 1888 | 79 g. | Baltimore | American Association | Baltimore, MD | |
| Thomas Burns | burns-001oys | 1888 | 52 g. | Brooklyn | American Association | Brooklyn, NY | |
| Tom Burns | burns-001tom | 1888 | 134 g. | Chicago | National League | Chicago, IL | |
| Doc Bushong | bushon001doc | 1888 | 69 g. | Brooklyn | American Association | Brooklyn, NY | |
| Steve Butler | butler002ste | 1888 | Joliet | Independent | Joliet, IL | ||
| Charlie Cady | cady--001cha | 1888 | 9 g. | Chicago Spaldings | ChicComm | Chicago, IL | |
| Charlie Cady | cady--001cha | 1888 | 7/16-8/9 | 11 g. | Chicago Maroons | Western Association | Chicago, IL |
| Frank Cahill | cahill006joh | 1888 | 4/25 - 7/21 | 47 g. | Bloomington Reds | Central Interstate League | Bloomington, IL |
| John Cahill | cahill001j-- | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| John Cahill | cahill008joh | 1888 | 7/14-8/8 | Columbus Senators | Tri-State League | Columbus, OH | |
| John Cahill | cahill006joh | 1888 | 26 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| John Cahill | cahill008joh | 1888 | 5/3-5/10 | Decatur | Central Interstate League | Decatur, IL | |
| John Cahill | cahill008joh | 1888 | 5/12-9/1 | Peoria Reds | Central Interstate League | Peoria, IL | |
| Tom Cahill | cahill001tom | 1888 | 7/12-7/28 | Worcester Grays | New England League | Worcester, MA | |
| David Cain | cain--001dav | 1888 | 4/28-7/27 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| David Cain | cain--001dav | 1888 | 8/1-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| David Cain | cain--001dav | 1888 | 8/10-8/14 | Hazleton Pugilists | Central League | Hazleton, PA | |
| George Cain | cain--002geo | 1888 | 5/19-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| George Cain | cain--002geo | 1888 | 8/21-9/14+ | London Tecumsehs | International Association | London, ON | |
| George Cain | cain--002geo | 1888 | Ashland | Central Pennsylvania League | Ashland, PA | ||
| John Cake | cake--001jos | 1888 | Lafayette Col. | College | , | ||
| John Cake | cake--001jos | 1888 | Philadelphia Young Americans | Independent | Philadelphia, PA | ||
| Charles Calhoun | calhou002cha | 1888 | 4/23-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Jack Calihan | 1888 | 5 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Tom Calihan | callah001tho | 1888 | 4/28-6/26 | Rochester Jingoes | International Association | Rochester, NY | |
| Tom Calihan | callah001tho | 1888 | 8/23-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| Will Calihan | caliha001wil | 1888 | 4/28-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Abe Callahan | callah001abe | 1888 | 2 g. | San Francisco | California State League | San Francisco, CA | |
| Ed Callahan | callah001ed- | 1888 | -6/ | Umpire | Cent | , | |
| Joe Callahan | 1888 | Umpire | Canad | , | |||
| Joe Callahan | 1888 | 5/7-6/5 | Umpire | NE | , | ||
| William Callendar | callen001wil | 1888 | 5/8- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| William Callendar | callen001wil | 1888 | Decatur Reds | Independent | Decatur, IL | ||
| Lew Camp | camp--001lew | 1888 | 9/25-9/30 | 3 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| John Campana | campan001joh | 1888 | Spring training | Omaha Omahogs/Lambs | Western Association | Omaha, NE | |
| John Campana | campan001joh | 1888 | 4/28-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| John Campana | campan001joh | 1888 | 9/15-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Count Campau | campau001cha | 1888 | 5/1-6/28 | 42 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Count Campau | campau001cha | 1888 | 7/7- | 70 g. | Detroit | National League | Detroit, MI |
| Frank Campbell | 1888 | Harvard Univ. | College | , | |||
| Grant Campbell | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| Harry Campbell | campbe003j-- | 1888 | 5/22- | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Harry Campbell | campbe003j-- | 1888 | 6/4-6/ | Decatur | Central Interstate League | Decatur, IL | |
| J. Campbell | campbe004j-- | 1888 | +5/29+ | Lafayette | Indiana State League | Lafayette, IN | |
| Joe Campbell | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| Peter Campbell | campbe001pet | 1888 | 5/19-7/30 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Peter L.? Campbell | 1888 | 8/9-8/14 | Norristown | PhilReg | Norristown, PA | ||
| Rich Campbell | 1888 | Umpire | IntSt | , | |||
| Rich Campbell | 1888 | Umpire | Cent | , | |||
| William Campion | campio002wil | 1888 | 4/28-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| Jim Canavan | canava001jim | 1888 | 3 g. | Rockford | Central Interstate League | Rockford, IL | |
| Jim Canavan | canava001jim | 1888 | 5/14- | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| Jim Canavan | canava001jim | 1888 | 7/20-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Billie Cannon | cannon005wil | 1888 | 5/19-6/16 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Hugh Cannon | cannon001hug | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| James Cantillon | cantil001jam | 1888 | 5/3- | Rockford | Central Interstate League | Rockford, IL | |
| James Cantillon | cantil001jam | 1888 | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | ||
| James Cantillon | cantil001jam | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Joe Cantillon | cantil001jos | 1888 | 5/3- | Rockford | Central Interstate League | Rockford, IL | |
| Joe Cantillon | cantil001jos | 1888 | Dubuque | Central Interstate League | Dubuque, IA | ||
| Joe Cantillon | cantil001jos | 1888 | Eau Claire | Independent | Eau Claire, WI | ||
| Bart Cantz | cantz-001bar | 1888 | 5/1-6/20 | 33 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Bart Cantz | cantz-001bar | 1888 | 7/25- | 37 g. | Baltimore | American Association | Baltimore, MD |
| Alexander Cardno | 1888 | Grand Forks | Independent | Grand Forks, ND | |||
| Daisy Carey | 1888 | 5/30-6/9 | Oswego | Eastern International League | Oswego, NY | ||
| Roger Carey | carey-001rog | 1888 | 4/28-9/29 | Scranton Miners | Central League | Scranton, PA | |
| Ed Carfrey | carfre001ed- | 1888 | 5/5-8/13 | Chester Houston | PhilReg | Chester, PA | |
| Fred Carl | carl--001fre | 1888 | 4/7-7/4 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Fred Carl | carl--001fre | 1888 | Charleston Seagulls | Southern League | Charleston, SC | ||
| John Carlin | carlin002joh | 1888 | 5/8-6/2 | Elmira | Central League | Elmira, NY | |
| George Carman | carman001geo | 1888 | 5/19-7/ | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Carney | 1888 | 7 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Jack Carney | carney002joh | 1888 | 4/28-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| William Carney | 1888 | Derby | Connecticut State League | Derby, CT | |||
| Carpenter | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Dave Carpenter | carpen002dav | 1888 | Elkhart | Indiana State League | Elkhart, IN | ||
| Hick Carpenter | carpen001hic | 1888 | 136 g. | Cincinnati | American Association | Cincinnati, OH | |
| Carr | 1888 | 42 g. | Charleston Seagulls | Southern League | Charleston, SC | ||
| James Carr | 1888 | 6/15-6/21 | Umpire | So | , | ||
| Carrigan | carrig011--- | 1888 | 4/28-5/29 | Easton | Central League | Easton, PA | |
| Carrigan | carrig009--- | 1888 | 6/6-7/4 | Allentown Peanuts | Central League | Allentown, PA | |
| Carroll | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Cliff Carroll | carrol002cli | 1888 | 5 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Cliff Carroll | carrol002cli | 1888 | 6/16-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Frank Carroll | carrol004fra | 1888 | 4/7- | 32 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Fred Carroll | carrol001fre | 1888 | 97 g. | Pittsburgh | National League | Pittsburgh, PA | |
| J. Carroll | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | |||
| J. P. Carroll | 1888 | Stockton | California League | Stockton, CA | |||
| J.W. Carroll | carrol002j-- | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| John Carroll | carrol001scr | 1888 | 4/28-10/4 | 122 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| John Carroll | carrol006joh | 1888 | Philadelphia Highland | Amat | Philadelphia, PA | ||
| Kid Carsey | carsey001wil | 1888 | Bergen Point | Independent | Bergen Point, NJ | ||
| Kid Carsey | carsey001wil | 1888 | New York Monitors | Independent | New York, NY | ||
| Carter | 1888 | 5/16-5/30 | Chester Houston | PhilReg | Chester, PA | ||
| Carter | carter003--- | 1888 | 6/28-8/6 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Carter | carter020--- | 1888 | 8/11 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Ed Cartwright | cartwr001ed- | 1888 | 5/1-10/9 | 110 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Bob Caruthers | caruth001bob | 1888 | 94 g. | Brooklyn | American Association | Brooklyn, NY | |
| Cary | cary--004--- | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| Cary | cary--004--- | 1888 | +7/4+ | South Bend | Indiana State League | South Bend, IN | |
| Cary | cary--004--- | 1888 | +7/14-7/21+ | Elkhart | Indiana State League | Elkhart, IN | |
| D. Casey | casey-000d-- | 1888 | +5/9-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Dan Casey | casey-002dan | 1888 | 33 g. | Philadelphia | National League | Philadelphia, PA | |
| Dennis Casey | casey-002den | 1888 | 4/28-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| James Casey | casey-003jam | 1888 | +5/19- | Lincoln Tree Planters | Western League | Lincoln, NE | |
| M. H. Casey | 1888 | Derby | Connecticut State League | Derby, CT | |||
| W. Casey | 1888 | Toronto Canucks | International Association | Toronto, ON | |||
| Will Casey | 1888 | Hoosic Falls | Independent | Hoosic Falls, NY | |||
| Ed Cassian | cassia001ed- | 1888 | Spring training | Omaha Omahogs/Lambs | Western Association | Omaha, NE | |
| Happy Cate | cate--000hap | 1888 | 5 g. | San Francisco Emersons | California State League | San Francisco, CA | |
| Cates | cates-002--- | 1888 | 6/16-7/4 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Cates | cates-005--- | 1888 | Marion | Indiana State League | Marion, IN | ||
| Harry Cato | 1888 | Cuban Giants | Independent | Cuban, | |||
| John Cattanach | cattan001joh | 1888 | 3 g. | San Francisco | California State League | San Francisco, CA | |
| Sandy Cavan | 1888 | 7/ - | 15 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| Cavanaugh | 1888 | 2 g. | Sacramento | California State League | Sacramento, CA | ||
| Cavanaugh | cavana015--- | 1888 | 6/12 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Cavanaugh | cavana021--- | 1888 | +6/14+ | Marion | Indiana State League | Marion, IN | |
| John Cavanaugh | cavana005joh | 1888 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | ||
| Caveney | cavene000--- | 1888 | 6 g. | San Francisco | California State League | San Francisco, CA | |
| Benjamin Chadwick | chadwi001ben | 1888 | 5/2-8/22 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Ice Box Chamberlain | chambe001ice | 1888 | 26 g. | Louisville | American Association | Louisville, KY | |
| Ice Box Chamberlain | chambe001ice | 1888 | 14 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Champion | champi002--- | 1888 | 6/2-6/7 | Mansfield | Tri-State League | Mansfield, OH | |
| Charles Champlin | 1888 | Mackinaw City | Mackinaw, MI | ||||
| Frank Champlin | champl001fra | 1888 | 5/19-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Jack Chapman | chapma002jac | 1888 | 4/28-9/29 | Buffalo Bisons | International Association | Buffalo, NY | |
| John Chapman | chapma005joh | 1888 | 5/8-8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| John Chapman | chapma005joh | 1888 | 8/9-9/27 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Charles | 1888 | Chester | Independent | Chester, PA | |||
| Charles Chase | chase-002cha | 1888 | 1 g. | Stockton | California League | Stockton, CA | |
| Alex Chatelle | 1888 | 2 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Alex Chatelle | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | ||
| O.I. Cheney | cheney001o-- | 1888 | 5/13-6/19 | Umpire | CIntSt | , | |
| O.I. Cheney | cheney001o-- | 1888 | -6/ | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Cupid Childs | childs001cla | 1888 | 4/23- | 2 g. | Philadelphia | National League | Philadelphia, PA |
| Cupid Childs | childs001cla | 1888 | 6/9-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Cupid Childs | childs001cla | 1888 | 9/8-9/19+ | Syracuse Stars | International Association | Syracuse, NY | |
| Robert Childs | childs002rob | 1888 | 4/11-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Robert Childs | childs002rob | 1888 | 7/21-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Robert Childs | childs002rob | 1888 | 9/2-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| William Chouquette | chouqu001wil | 1888 | Emporia | Independent | Emporia, KS | ||
| William Chouquette | chouqu001wil | 1888 | Las Vegas | NMSt | Las Vegas, NV | ||
| H.B. Chrisman | chrism001h-- | 1888 | 4/26-5/19 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| H.B. Chrisman | chrism001h-- | 1888 | 6/1-7/3 | Columbus Senators | Tri-State League | Columbus, OH | |
| H.B. Chrisman | chrism001h-- | 1888 | 7/13-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Frank Christian | 1888 | 2 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| John Clapp | clapp-001joh | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | |
| Daniel Clare | clare-001dan | 1888 | 4/28-9/7 | Worcester Grays | New England League | Worcester, MA | |
| William Clare | clare-001wil | 1888 | 5/19-6/8 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| William Clare | clare-001wil | 1888 | 6/20-6/27 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| William Clare | clare-001wil | 1888 | Ashland | Central Pennsylvania League | Ashland, PA | ||
| Clark | 1888 | 5/12 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| Clark | 1888 | 5/5-6/20 | Camden | PhilReg | Camden, NJ | ||
| Clark | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| Bob Clark | clark-001bob | 1888 | 45 g. | Brooklyn | American Association | Brooklyn, NY | |
| J. Clark | 1888 | 5/12-6/20 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| L. Clark | 1888 | 6/9-6/16 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Spider Clark | clark-001spi | 1888 | 4/28-9/6 | Manchester Maroons | New England League | Manchester, NH | |
| Spider Clark | clark-001spi | 1888 | 9/15-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Dad Clarke | clarke001dad | 1888 | 4/23- | 2 g. | Chicago | National League | Chicago, IL |
| Dad Clarke | clarke001dad | 1888 | 5/24-10/6 | 36 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| William Clarke | clarke004wil | 1888 | NM | , | |||
| Dad Clarkson | clarks001dad | 1888 | 5/3 | 1 g. | Chicago Maroons | Western Association | Chicago, IL |
| Dad Clarkson | clarks001dad | 1888 | 5/23-6/30 | Lima Lushers | Tri-State League | Lima, OH | |
| Dad Clarkson | clarks001dad | 1888 | Cambridge | Amat | Cambridge, MA | ||
| John Clarkson | clarks001joh | 1888 | 55 g. | Boston | National League | Boston, MA | |
| Edward Clayton | clayto001edw | 1888 | 5/2 | Elmira | Central League | Elmira, NY | |
| Fred Clement | clemen001ed- | 1888 | 5/26-5/30 | Norristown | PhilReg | Norristown, PA | |
| Jack Clements | clemen001jac | 1888 | 86 g. | Philadelphia | National League | Philadelphia, PA | |
| Elmer Cleveland | clevel001elm | 1888 | 9 g. | New York | National League | New York, NY | |
| Elmer Cleveland | clevel001elm | 1888 | 30 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Dennis Clifford | cliffo001den | 1888 | 5/18-5/23 | Worcester Grays | New England League | Worcester, MA | |
| Monk Cline | cline-001mon | 1888 | 4/7-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Monk Cline | cline-001mon | 1888 | 73 g. | Kansas City | American Association | Kansas City, MO | |
| Clinton | 1888 | 5/30-8/4 | Norristown | PhilReg | Norristown, PA | ||
| Jim Clinton | clinto001jim | 1888 | 4/28-6/21 | Manchester Maroons | New England League | Manchester, NH | |
| Cloonin | 1888 | 4 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Herbert Clough | clough001her | 1888 | 7/8-9/10 | Manchester Maroons | New England League | Manchester, NH | |
| Clyde | 1888 | 5/12 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| T.J. Coakley | coakle001t-- | 1888 | 22 g. | Penn Yan | Central New York League | Penn Yan, NY | |
| George Cobb | cobb--003geo | 1888 | Charles City | Independent | Charles City, IA | ||
| Thomas? Cockman | 1888 | +6/1-7/30 | Belleville | Eastern International League | Belleville, NJ | ||
| Thomas? Cockman | 1888 | +8/6-8/14 | Brockville | Eastern International League | Brockville, ON | ||
| Charles Coffle | 1888 | no g. | Ashland | Central Pennsylvania League | Ashland, PA | ||
| Cole | cole--001--- | 1888 | Elmira | Central League | Elmira, NY | ||
| Archie Cole | cole--001arc | 1888 | Sexton Hose | Independent | Sexton, | ||
| Archie Cole | cole--001arc | 1888 | 4/28-9/10 | Elmira | Central League | Elmira, NY | |
| John Coleman | colema002joh | 1888 | 116 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Albert Collet | collet001alb | 1888 | 2 g. | San Francisco | California State League | San Francisco, CA | |
| Collins | collin080--- | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Collins | collin010--- | 1888 | 5/2-5/12 | Scranton Miners | Central League | Scranton, PA | |
| Collins | collin070--- | 1888 | 7/25-7/31 | Easton | Central League | Easton, PA | |
| Bill Collins | collin001bil | 1888 | 6/20-6/23 | Lynn Shoemakers | New England League | Lynn, MA | |
| Chub Collins | collin001chu | 1888 | 4/28-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Chub Collins | collin001chu | 1888 | 4/28-9/18 | Rochester Jingoes | International Association | Rochester, NY | |
| Frank Collins | 1888 | 5/5-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Fred Collins | collin004fre | 1888 | New York Gorhams | Independent | New York, NY | ||
| Hub Collins | collin001hub | 1888 | 116 g. | Louisville | American Association | Louisville, KY | |
| Hub Collins | collin001hub | 1888 | 12 g. | Brooklyn | American Association | Brooklyn, NY | |
| Hugh Collins | collin001hug | 1888 | 4/30-8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| Joseph Collins | collin001jos | 1888 | Philadelphia Highland | Amat | Philadelphia, PA | ||
| Joseph Collins | collin001jos | 1888 | 6/6 | Philadelphia Germantown | PhilReg | Philadelphia, PA | |
| Charlie Comiskey | comisk001cha | 1888 | 137 g. | St. Louis Browns | American Association | St. Louis, MO | |
| James Conahan | conaha001jam | 1888 | 5/5-8/13 | Chester Houston | PhilReg | Chester, PA | |
| Conklin | conkli002--- | 1888 | 6/13 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Conley | 1888 | 2 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Alphonse Conley | conley002alp | 1888 | 5/2- | Decatur | Central Interstate League | Decatur, IL | |
| Alphonse Conley | conley002alp | 1888 | 20 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Conlin | conlin001--- | 1888 | 8/31 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Joseph Conn | 1888 | 5/5-8/14 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Peter Connell | connel001pet | 1888 | 4/23-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Peter Connell | connel001pet | 1888 | 9/7-9/12 | London Tecumsehs | International Association | London, ON | |
| Connelly | connel014--- | 1888 | 1 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Connolly | 1888 | 7/12 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Connor | connor032--- | 1888 | 7/6-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Jim Connor | connor001jim | 1888 | Porstmouth | Independent | Porstmouth, NH | ||
| Roger Connor | connor001rog | 1888 | 134 g. | New York | National League | New York, NY | |
| Connors | connor047--- | 1888 | +5/9-6/9 | Elkhart | Indiana State League | Elkhart, IN | |
| Denny Connors | connor001den | 1888 | 4/28-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| J.H. Connors | connor003j-- | 1888 | 4/27-5/6 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Jerry Connors | connor001jer | 1888 | Cleveland Stars | Independent | Cleveland, OH | ||
| Conway | conway020--- | 1888 | 1 g. | Rockford | Central Interstate League | Rockford, IL | |
| Conway | conway005--- | 1888 | Bloomington Reds | Central Interstate League | Bloomington, IL | ||
| Conway | conway016--- | 1888 | 9/24 | Buffalo Bisons | International Association | Buffalo, NY | |
| Bill Conway | conway001bil | 1888 | 4/8-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Dick Conway | conway001dic | 1888 | 7 g. | Boston | National League | Boston, MA | |
| Jim Conway | conway001jim | 1888 | 5/5-9/22 | 31 g. | Kansas City Blues | Western Association | Kansas City, MO |
| L.E. Conway | conway000le- | 1888 | Lafayette | Indiana State League | Lafayette, IN | ||
| L.E. Conway | conway000le- | 1888 | +7/4-8/2+ | South Bend | Indiana State League | South Bend, IN | |
| Pete Conway | conway001pet | 1888 | 45 g. | Detroit | National League | Detroit, MI | |
| John Coogan | coogan001joh | 1888 | 4/28-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Cook | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Bert Cook | 1888 | Negaunee | UppPenin | Negaunee, | |||
| Lewis Cook | cook--002lew | 1888 | 4/24-8/31 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Michael Cook | cook--004mic | 1888 | 5/5-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | |
| Michael Cook | cook--004mic | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Paul Cook | cook--003pau | 1888 | 57 g. | Louisville | American Association | Louisville, KY | |
| William Cook | cook--005wil | 1888 | 5/8-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Coon | 1888 | Burlington | Independent | Burlington, NJ | |||
| Jerry Cooney | 1888 | 2 g. | San Francisco Emersons | California State League | San Francisco, CA | ||
| Jimmy Cooney | cooney002jim | 1888 | 5/10-10/7 | 109 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| William Cooney | cooney002wil | 1888 | 4/7- | 42 g. | San Francisco Pioneers | California League | San Francisco, CA |
| William Cooney | cooney002wil | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| Coons | coons-001--- | 1888 | 4/22 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Cooper | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| L. Copeland | copela000l-- | 1888 | +5/23-5/26+ | Logansport | Indiana State League | Logansport, IN | |
| Jack Corbett | corbet001jac | 1888 | 5/27-6/12 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Jack Corbett | corbet001jac | 1888 | 7/2-7/25 | Lima Lushers | Tri-State League | Lima, OH | |
| Jack Corbett | corbet001jac | 1888 | 8/8-10/4 | 48 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Corcoran | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Corcoran | 1888 | 6/19-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| David Corcoran | corcor001dav | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| David Corcoran | corcor001dav | 1888 | 8/1-9/7 | Worcester Grays | New England League | Worcester, MA | |
| Jack Corcoran | corcor001jac | 1888 | 5/3-9/29 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Larry Corcoran | corcor001lar | 1888 | 5/10-7/24 | London Tecumsehs | International Association | London, ON | |
| Tommy Corcoran | corcor002tho | 1888 | 4/28-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| William Corcoran | corcor001wil | 1888 | 5/15-7/26 | Allentown Peanuts | Central League | Allentown, PA | |
| William Corcoran | corcor001wil | 1888 | 7/31-8/14 | Elmira | Central League | Elmira, NY | |
| Phil Coridan | corida001phi | 1888 | +5/9-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Bill Corkery | 1888 | 3 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Frank Corkhill | corkhi001fra | 1888 | 5/8- | Hutchinson | Western League | Hutchinson, KS | |
| Frank Corkhill | corkhi001fra | 1888 | 9/13 | 1 g. | Chicago Maroons | Western Association | Chicago, IL |
| John Corkhill | corkhi001pop | 1888 | 118 g. | Cincinnati | American Association | Cincinnati, OH | |
| John Corkhill | corkhi001pop | 1888 | 19 g. | Brooklyn | American Association | Brooklyn, NY | |
| P. Corrigan | 1888 | Lafayette | Indiana State League | Lafayette, IN | |||
| Cotton | 1888 | 5/5-8/14 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| David Coughlin | coughl001dav | 1888 | 5/30-6/21 | Manchester Maroons | New England League | Manchester, NH | |
| David Coughlin | coughl001dav | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| David Coughlin | coughl001dav | 1888 | 7/22-8/16 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Roscoe Coughlin | coughl001ros | 1888 | 1 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Roscoe Coughlin | coughl001ros | 1888 | 12 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| Roscoe Coughlin | coughl001ros | 1888 | 6/2-7/14 | 8 g. | Chicago Maroons | Western Association | Chicago, IL |
| Roscoe Coughlin | coughl001ros | 1888 | 8/2-8/27 | Albany Governors | International Association | Albany, NY | |
| Courduff | 1888 | 6/25 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Cox | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| John Cox | cox---008joh | 1888 | 5/30-7/14 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | |
| John Cox | cox---008joh | 1888 | 7/23-8/14 | Norristown | PhilReg | Norristown, PA | |
| Coyne | coyne-003--- | 1888 | 5/8-5/9 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Craig | 1888 | 5/9-5/23 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| R.H. Craig | craig-002r-- | 1888 | 3/30-4/1 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| R.H. Craig | craig-002r-- | 1888 | Umpire | Tx | , | ||
| Edward Cramer | cramer001dic | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | ||
| Edward Cramer | cramer002edw | 1888 | 8/2-8/4 | Elmira | Central League | Elmira, NY | |
| Ed Crane | crane-001ed- | 1888 | -7/19 | 12 g. | New York | National League | New York, NY |
| Sam Crane | crane-002sam | 1888 | 4/28-9/29 | Scranton Miners | Central League | Scranton, PA | |
| Fred Craves | craves001fre | 1888 | +7/31+ | Saginaw City | Independent | Saginaw City, MI | |
| Crawford | 1888 | 9/15 | 1 g. | Chicago Maroons | Western Association | Chicago, IL | |
| Dave Creamer | creame002dav | 1888 | 4/7 | Stockton | California League | Stockton, CA | |
| Dave Creamer | creame002dav | 1888 | 4/29- | 20 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Creclan | 1888 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |||
| Joseph Creegan | creega001jos | 1888 | 6 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| Joseph Creegan | creega001jos | 1888 | 6/5-9/29 | Elmira | Central League | Elmira, NY | |
| Mark Creegan | creega001mar | 1888 | 5 g. | San Francisco | California State League | San Francisco, CA | |
| Creelan | creela001--- | 1888 | 7/14 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Gus Creely | creely001gus | 1888 | +5/12- | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| H. Creighton | creigh001h-- | 1888 | 5/12- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| L. M. Cretors | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | |||
| James Crinnan | crinna001jam | 1888 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | ||
| Jack Croghan | crogan001joh | 1888 | 5/1-6/2 | 21 g. | Chicago Maroons | Western Association | Chicago, IL |
| Jack Croghan | crogan001joh | 1888 | 6/11-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Curtis Crolius | croliu001cur | 1888 | 5/19-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Daniel Cronin | cronin003dan | 1888 | Keene | semi-pro | Keene, NH | ||
| Jack Crooks | crooks001jac | 1888 | 4/28-6/20 | 39 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Jack Crooks | crooks001jac | 1888 | 6/23-10/7 | 83 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Frederick Crosby | 1888 | 2 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Clarence Cross | cross-001cla | 1888 | 4/7-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| Clarence Cross | cross-001cla | 1888 | 7/10 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Clarence Cross | cross-001cla | 1888 | 7/15-7/18 | Houston Babies | Texas-Southern League | Houston, TX | |
| Clarence Cross | cross-001cla | 1888 | 7/25-8/7 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Joe Cross | cross-001jos | 1888 | Cleveland | s-pro | Cleveland, OH | ||
| Joe Cross | cross-001jos | 1888 | 9/5 | 1 g. | Louisville | American Association | Louisville, KY |
| Lave Cross | cross-001laf | 1888 | 46 g. | Louisville | American Association | Louisville, KY | |
| William Crossley | crossl001wil | 1888 | 5/3- | 42 g. | Davenport | Central Interstate League | Davenport, IA |
| William Crossley | crossl001wil | 1888 | 8/8-9/27 | 17 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Doug Crothers | crothe001dou | 1888 | 4/7-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| Doug Crothers | crothe001dou | 1888 | 7/10-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Joe Crotty | crotty001joe | 1888 | Memphis Grays | Southern League | Memphis, TN | ||
| Joe Crotty | crotty001joe | 1888 | 6/15-7/13 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Billy Crowell | crowel001bil | 1888 | 18 g. | Cleveland | American Association | Cleveland, OH | |
| Billy Crowell | crowel001bil | 1888 | 1 g. | Louisville | American Association | Louisville, KY | |
| Bill Crowley | crowle001bil | 1888 | 4/28-6/2 | London Tecumsehs | International Association | London, ON | |
| Bill Crowley | crowle001bil | 1888 | 7/4-8/14 | Toledo Maumees | Tri-State League | Toledo, OH | |
| John Crowley | crowle002joh | 1888 | 5/7-5/21 | Portland | New England League | Portland, ME | |
| John Crowley | crowle002joh | 1888 | Gardner | Independent | Gardner, ME | ||
| Jim Cudworth | cudwor001jim | 1888 | 4/28-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| John Cuff | cuff--001joh | 1888 | 4/30-9/28 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Eddie Cull | cull--001edw | 1888 | 3 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| M. S. Cummings | 1888 | Saratoga | Independent | Saratoga, NY | |||
| Cunningham | cunnin024--- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| Bert Cunningham | cunnin001ell | 1888 | 51 g. | Baltimore | American Association | Baltimore, MD | |
| John Curran | 1888 | +5/12+ | Leavenworth Soldiers | Western League | Leavenworth, KS | ||
| P. Curran | 1888 | +5/12+ | Leavenworth Soldiers | Western League | Leavenworth, KS | ||
| James Curry | curry-002jam | 1888 | 4/25-6/24 | Columbus Senators | Tri-State League | Columbus, OH | |
| James Curry | curry-002jam | 1888 | 7/10-8/8 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| James Curry | curry-002jam | 1888 | 8/19-8/26 | Umpire | TriSt | , | |
| Wes Curry | curry-001wes | 1888 | 4/28-9/15+ | Umpire | Int | , | |
| Curtin | curtin003--- | 1888 | Rochester Sachs-Prudens | Independent | Rochester, NY | ||
| Curtin | curtin003--- | 1888 | 6/30-7/4 | Auburn Yankees | Central New York League | Auburn, NY | |
| Jim Curtiss | curtis001jim | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Jim Curtiss | curtis001jim | 1888 | 7/6-7/21 | 12 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Jim Curtiss | curtis001jim | 1888 | 3 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| Cushman | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Charlie Cushman | cushma001cha | 1888 | 4/28-9/29 | Toronto Canucks | International Association | Toronto, ON | |
| Ed Cushman | cushma001ed- | 1888 | 5/2-9/23 | 34 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Andy Cusick | cusick001and | 1888 | 4/28-7/7 | 49 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Jim Cusisk | cusisk001jim | 1888 | 3 g. | San Francisco | California State League | San Francisco, CA | |
| Ned Cuthbert | cuthbe001ned | 1888 | MLB Umpire | American Association | , | ||
| Dailey | dailey001--- | 1888 | 6/20-6/30 | Albany Governors | International Association | Albany, NY | |
| John Dailey | dailey001joh | 1888 | Umpire | Tx | , | ||
| Vince Dailey | dailey001vin | 1888 | 4/23-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Vince Dailey | dailey001vin | 1888 | 9/10-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| Daily | 1888 | 5/5-8/13 | Chester Houston | PhilReg | Chester, PA | ||
| Con Daily | daily-001con | 1888 | 57 g. | Indianapolis | National League | Indianapolis, IN | |
| Ed Daily | daily-001ed- | 1888 | 110 g. | Washington | National League | Washington, DC | |
| Hugh Daily | daily-001hug | 1888 | Norfolk | S-P | Norfolk, VA | ||
| William Dale | dale--001wil | 1888 | 4/23-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| Daley | daley-005--- | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| Daley | daley-001--- | 1888 | 5/31 | Binghamton Crickets | Central League | Binghamton, NY | |
| Bill Daley | daley-001bil | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Jack Dallas | dallas001jac | 1888 | NMSt | , | |||
| James Dallas | dallas001jam | 1888 | Chicago Maroons | Western Association | Chicago, IL | ||
| Abner Dalrymple | dalrym001abn | 1888 | 57 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Andrew Dalton | dalton001and | 1888 | Green Bay | MiSt | Green Bay, WI | ||
| Daly | daly--001--- | 1888 | 5/5-5/19 | Elmira | Central League | Elmira, NY | |
| Harry? Daly | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| Harry? Daly | 1888 | 5/5-7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Sun Daly | daly--001sun | 1888 | 7/20-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Sun Daly | daly--001sun | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| T. Daly | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | |||
| Tom Daly | daly--002tho | 1888 | 65 g. | Chicago | National League | Chicago, IL | |
| Law Daniels | daniel002law | 1888 | 61 g. | Kansas City | American Association | Kansas City, MO | |
| Pete Daniels | daniel003pet | 1888 | 4 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Darby | 1888 | 6/27 | Chester Houston | PhilReg | Chester, PA | ||
| Dell Darling | darlin001del | 1888 | 20 g. | Chicago | National League | Chicago, IL | |
| William Darnbrough | darnbr001wil | 1888 | 11 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| John Darrah | darrah001joh | 1888 | 4/24-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| Erwin Darrow | darrow001ira | 1888 | 4/23-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| Mordecai Davidson | davids001mor | 1888 | g. | Louisville | American Association | Louisville, KY | |
| George Davies | davies001geo | 1888-91 | U. of Wisconsin | College | , | ||
| Davin | davin-001--- | 1888 | 9/13 | Easton | Central League | Easton, PA | |
| David Davin | davin-001dav | 1888 | 4/28-6/7 | 20 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| David Davin | davin-001dav | 1888 | 7/19-9/5 | Manchester Maroons | New England League | Manchester, NH | |
| Davis | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Ambrose Davis | davis-001amb | 1888 | New York Gorhams | Independent | New York, NY | ||
| C. Davis | 1888 | 6/2-7/18 | Norristown | PhilReg | Norristown, PA | ||
| Daisy Davis | davis-001dai | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| Daisy Davis | davis-001dai | 1888 | Gardner | Independent | Gardner, ME | ||
| Jumbo Davis | davis-001jum | 1888 | 121 g. | Kansas City | American Association | Kansas City, MO | |
| W. Davis | 1888 | 5/26-7/14 | Norristown | PhilReg | Norristown, PA | ||
| Frank Day | day---001fra | 1888 | Detroit Cass | Independent | Detroit, MI | ||
| Frank Day | day---001fra | 1888 | 5/11-6/4 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Frank Day | day---001fra | 1888 | 6/25-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| H.H. Dayton | dayton000hh- | 1888 | +5/23+ | Logansport | Indiana State League | Logansport, IN | |
| W.H. Dayton | dayton001w-- | 1888 | 5/2 | Lowell Chippies | New England League | Lowell, MA | |
| W.H. Dayton | dayton001w-- | 1888 | Nashua | New England Interstate League | Nashua, NH | ||
| Pat Dealy | dealy-001pat | 1888 | 4/28-9/5 | Troy Trojans | International Association | Troy, NY | |
| Dean | dean--001--- | 1888 | 8/12 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| John Deasley | deasle001joh | 1888 | 5/5-5/12 | Camden | PhilReg | Camden, NJ | |
| John Deasley | deasle001joh | 1888 | 5/17-7/18 | Easton | Central League | Easton, PA | |
| John Deasley | deasle001joh | 1888 | 7/23-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Pat Deasley | deasle001pat | 1888 | 34 g. | Washington | National League | Washington, DC | |
| George Decker | decker003geo | 1888 | Los Angeles | Independent | Los Angeles, CA | ||
| George Decker | decker003geo | 1888 | Aspen | Colorado State League | Aspen, CO | ||
| Harry Decker | decker001har | 1888 | 4/28-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| Stewart Decker | 1888 | -6/12 | 39 g. | MLB Umpire | National League | , | |
| Stewart Decker | 1888 | 9/1-9/18+ | Umpire | Int | , | ||
| Decry | decry-001--- | 1888 | 7/3 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Jim Dee | dee---001jim | 1888 | 4/28-6/12 | Albany Governors | International Association | Albany, NY | |
| Jim Dee | dee---001jim | 1888 | 7/4-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Jim Dee | dee---001jim | 1888 | 7/12-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Jim Dee | dee---001jim | 1888 | 12 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| James Deegan | deegan001jam | 1888 | 46 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| James Deegan | deegan001jam | 1888 | 9/2-9/30 | 12 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Deevin | deevin001--- | 1888 | 8/1 | Easton | Central League | Easton, PA | |
| Ed Delahanty | delaha001edw | 1888 | 4/26-5/21 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Ed Delahanty | delaha001edw | 1888 | 5/22- | 74 g. | Philadelphia | National League | Philadelphia, PA |
| Bill Delaney | delane001bil | 1888 | 4/23-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| C. Delaney | delane002c-- | 1888 | 6/2-6/3 | Canton Nadjys | Tri-State League | Canton, OH | |
| Daniel Delaney | delane001dan | 1888 | 5/30-6/16 | Belleville | Eastern International League | Belleville, NJ | |
| F. Delmas | delmas001f-- | 1888 | 1 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| F. Delmas | delmas001f-- | 1888 | 7 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| F. Delmas | delmas001f-- | 1888 | 3 g. | San Francisco | California State League | San Francisco, CA | |
| Fred Demarais | demara001fre | 1888 | 4/30-7/20 | Lynn Shoemakers | New England League | Lynn, MA | |
| Fred Demarais | demara001fre | 1888 | 7/31-8/4 | Worcester Grays | New England League | Worcester, MA | |
| Fred Demarais | demara001fre | 1888 | Royalston | Independent | Royalston, MA | ||
| Jack Demorest | demore001jac | 1888 | Milford | Independent | Milford, DE | ||
| Dennis | 1888 | Burlington | Independent | Burlington, NJ | |||
| Howard Denny | denny-001how | 1888 | Bloomington Reds | Interstate League | Bloomington, IL | ||
| Jerry Denny | denny-001jer | 1888 | 126 g. | Indianapolis | National League | Indianapolis, IN | |
| Mike DePangher | depang001mik | 1888 | 3/29- | 5 g. | Stockton | California League | Stockton, CA |
| John Depinet | depine000joh | 1888 | Erie Drummers | Independent | Erie, PA | ||
| Deppler | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Deraight | 1888 | 9 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Gene Derby | derby-001gen | 1888 | 5/1-7/31 | Worcester Grays | New England League | Worcester, MA | |
| George Derby | derby-002geo | 1888 | Saginaw | Independent | Saginaw, MI | ||
| Jess Derrick | derric001jes | 1888 | 5/11 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Jess Derrick | derric001jes | 1888 | Albuquerque | NMSt | Albuquerque, NM | ||
| Henry Devaull | devaul001hen | 1888 | 3 g. | San Francisco | California State League | San Francisco, CA | |
| William Deveney | devinn001pun | 1888 | 5/5-8/13 | Chester Houston | PhilReg | Chester, PA | |
| Devine | 1888 | 5/30 | Oswego | Eastern International League | Oswego, NY | ||
| Joseph Devine | devine003jos | 1888 | 5/21 | Columbus Senators | Tri-State League | Columbus, OH | |
| Joseph Devine | devine003jos | 1888 | 6/16-6/22 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Devlin | 1888 | Chester | Independent | Chester, PA | |||
| Charles Devlin | devlin001cha | 1888 | 5/19-6/30 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Charles Devlin | devlin001cha | 1888 | Lincoln Tree Planters | Western League | Lincoln, NE | ||
| Charles Devlin | devlin001cha | 1888 | 6/21,10/3 | MLB Umpire | American Association | , | |
| Jim Devlin | devlin002jim | 1888 | 11 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Devore | devore002--- | 1888 | 5/2-6/ | 21 g. | Decatur | Central Interstate League | Decatur, IL |
| Charlie Dewald | dewald001cha | 1888 | Cleveland | Independent | Cleveland, OH | ||
| Diamond | 1888 | 7/18-7/21 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Buttercup Dickerson | dicker001but | 1888 | 4/28-9/15+ | London Tecumsehs | International Association | London, ON | |
| William Diebel | deibel001wil | 1888 | St. Louis Peach Pies | Amat | St. Louis, MO | ||
| Andy Dillon | dillon001and | 1888 | 4/23-7/7 | Lima Lushers | Tri-State League | Lima, OH | |
| Andy Dillon | dillon001and | 1888 | 7/27 | Belleville | Eastern International League | Belleville, NJ | |
| Andy Dillon | dillon001and | 1888 | +8/11-8/14 | Brockville | Eastern International League | Brockville, ON | |
| James Dillon | dillon002jam | 1888 | 4/26-7/19 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| James Dillon | dillon002jam | 1888 | 7/24-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| William Dilworth | dilwor001wil | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| Frank Diven | diven-001fra | 1888 | 5/30-6/2 | Easton | Central League | Easton, PA | |
| John Dix | dix---001joh | 1888 | 6/6-7/5 | Chester Houston | PhilReg | Chester, PA | |
| Eddie Dixon | dixon-002edw | 1888 | 4/28-6/4 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Dobson | dobson008--- | 1888 | +7/4-7/23+ | South Bend | Indiana State League | South Bend, IN | |
| Marcellus Dochterman | dochte001mar | 1888 | 5/3 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Fred Doe | doe---002fre | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| Robert Doehlman | doehlm000rob | 1888 | Frankfort | Indiana State League | Frankfort, IN | ||
| Doherty | dohert010--- | 1888 | 5/2- | 39 g. | Dubuque | Central Interstate League | Dubuque, IA |
| Doherty | dohert016--- | 1888 | Peoria Reds | Central Interstate League | Peoria, IL | ||
| F. Dolan | dolan-001f-- | 1888 | 6/7 | Hamilton Hams | International Association | Hamilton, ON | |
| John Dolan | dolan-002joh | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| John Dolan | dolan-002joh | 1888 | 6/20-7/4 | Elkhart | Indiana State League | Elkhart, IN | |
| Tom Dolan | dolan-001tom | 1888 | 4/28-6/20 | 25 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Tom Dolan | dolan-001tom | 1888 | -10/14 | 11 g. | St. Louis Browns | American Association | St. Louis, MO |
| Dolber | dolber001--- | 1888 | 5/3-5/5 | Galveston Giants | Texas League | Galveston, TX | |
| Jack Donahue | donahu001jac | 1888 | 64 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Jim Donahue | donahu001jim | 1888 | 88 g. | Kansas City | American Association | Kansas City, MO | |
| Joe Donahue | 1888 | 6 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Donaldson | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| James Donnelly | donnel003jam | 1888 | 5/1-5/2 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Jim Donnelly | donnel002jim | 1888 | 122 g. | Washington | National League | Washington, DC | |
| Alexander Donoghue | donohu001ale | 1888 | 4/23-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| Donohue | 1888 | 6/9 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Jack Donohue | donohu001jac | 1888 | 3/29- | 45 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| Joe Donohue | donohu001joe | 1888 | 5/2 | Syracuse Stars | International Association | Syracuse, NY | |
| Joe Donohue | donohu001joe | 1888 | 5/31 | Oswego | Eastern International League | Oswego, NY | |
| Joe Donohue | donohu001joe | 1888 | 6/6-6/20+ | Watertown | Eastern International League | Watertown, NY | |
| Joe Donohue | donohu001joe | 1888 | 7/- | 6 g. | Auburn Yankees | Central New York League | Auburn, NY |
| John Donohue | donohu002joh | 1888 | 3/29- | 64 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Donovan | donova001--- | 1888 | 9/5 | Albany Governors | International Association | Albany, NY | |
| Bill Donovan | 1888 | 2 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Jack Donovan | donova002jac | 1888 | 4/7- | 44 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| Jack Donovan | donova002jac | 1888 | 1 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Jack Donovan | donova003jac | 1888 | +5/9-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Jack Donovan | donova003jac | 1888 | 8/24-9/14 | Canandaigua | Central New York League | Canandaigua, NY | |
| Patsy Donovan | donova001pat | 1888 | 4/28-9/15+ | London Tecumsehs | International Association | London, ON | |
| Dooley | 1888 | 5 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Dooley | 1888 | 21 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Charles Dooley | dooley001cha | 1888 | 3/30-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| Charles Dooley | dooley001cha | 1888 | 7/11-8/11 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Harry Dooms | dooms-001har | 1888 | 5/1-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Doran | doran-007--- | 1888 | Danbury | Connecticut State League | Danbury, CT | ||
| John Doran | doran-002joh | 1888 | 4/30-6/17 | 25 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| John Doran | doran-002joh | 1888 | 8/28-9/15 | 15 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| John Doran | doran-001joh | 1888 | 4/28-5/2 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| John Doran | doran-001joh | 1888 | 6/16-9/29 | Elmira | Central League | Elmira, NY | |
| Albert Dorsey | dorsey001alb | 1888 | 11 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Albert Dorsey | dorsey001alb | 1888 | +5/4+ | Logansport | Indiana State League | Logansport, IN | |
| Jerry Dorsey | dorsey004jer | 1888 | 3 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| Billy Dotson | dotson000bil | 1888 | +6/19+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Billy Dotson | dotson000bil | 1888 | +7/26-8/2+ | Umpire | InSt | , | |
| Mack Dotson | dotson000mac | 1888 | +6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Mack Dotson | dotson000mac | 1888 | Elkhart | Indiana State League | Elkhart, IN | ||
| J. S. Dougherty | 1888 | Danbury | Connecticut State League | Danbury, CT | |||
| Pizzaro Douthett | douthe001piz | 1888 | 3/30-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Pizzaro Douthett | douthe001piz | 1888 | 7/10-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| Tommy Dowd | dowd--001tho | 1888 | Holyoke | Independent | Holyoke, MA | ||
| Tommy Dowd | dowd--001tho | 1888 | 6/10-6/11 | Worcester Grays | New England League | Worcester, MA | |
| Dowdle | 1888 | 5/30-6/1 | Kingston | Eastern International League | Kingston, ON | ||
| Joe Dowie | dowie-001joe | 1888 | 3/30-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| Joe Dowie | dowie-001joe | 1888 | 7/11-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Billy Dowling | dowlin001bil | 1888 | 5 g. | Penn Yan | Central New York League | Penn Yan, NY | |
| Billy Dowling | dowlin001bil | 1888 | 21 g. | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Sam Downey | downey001sam | 1888 | 7/30-8/29 | Albany Governors | International Association | Albany, NY | |
| William Downs | downs-002wil | 1888 | Chicago | Amat | Chicago, IL | ||
| Tom Dowse | dowse-001tom | 1888 | 4/28-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Doyle | doyle-043--- | 1888 | 5/30-8/14 | Kingston | Eastern International League | Kingston, ON | |
| Doyle | 1888 | 3 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Doyle | 1888 | +7/4-7/28 | Belleville | Eastern International League | Belleville, NJ | ||
| Conny Doyle | doyle-001con | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Conny Doyle | doyle-001con | 1888 | Royalston | Independent | Royalston, MA | ||
| Edward Doyle | doyle-002edw | 1888 | 4/30-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| J. Doyle | 1888 | 5/26-6/20 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Jack Doyle | doyle-002joh | 1888 | St. John's(Fordham) | College | , | ||
| Jack Doyle | doyle-002joh | 1888 | 5/3-6/6 | Lynn Shoemakers | New England League | Lynn, MA | |
| Jack Doyle | doyle-002joh | 1888 | 7/7-7/17 | Manchester Maroons | New England League | Manchester, NH | |
| James Doyle | doyle-009jam | 1888 | 5/9-5/19 | Lowell Chippies | New England League | Lowell, MA | |
| Michael Doyle | doyle-003mic | 1888 | 5/23 | Allentown Peanuts | Central League | Allentown, PA | |
| P. Doyle | 1888 | 5 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Jake Drauby | drauby001jak | 1888 | 5/19-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Jake Drauby | drauby001jak | 1888 | 8/16-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Benjamin Drischel | drisch001ben | 1888 | 4/23-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Driscoll | 1888 | 5 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| E. Drummond | drummo001e-- | 1888 | 5/14- | 21 g. | Decatur | Central Interstate League | Decatur, IL |
| E. Drummond | drummo001e-- | 1888 | Dubuque | Central Interstate League | Dubuque, IA | ||
| Bert Duane | duane-001alb | 1888 | 17 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Dubell | 1888 | Burlington | Independent | Burlington, NJ | |||
| Duff | 1888 | 7/4-7/12 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Duff | 1888 | 8/1-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Charlie Duffee | duffee001cha | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Charlie Duffee | duffee001cha | 1888 | 7/21-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Duffy | duffy-029--- | 1888 | Philadelphia Young Americans | Independent | Philadelphia, PA | ||
| Hugh Duffy | duffy-001hug | 1888 | 6/23- | 71 g. | Chicago | National League | Chicago, IL |
| Michael Duffy | duffy-002mic | 1888 | 5/1-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Ed Dugan | dugan-001ed- | 1888 | Hutchinson | Western League | Hutchinson, KS | ||
| G. Dugan | 1888 | 5/5-6/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| M. Dugan | 1888 | 6/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Dan Dugdale | dugdal001dan | 1888 | 5/2-10/7 | 73 g. | Chicago Maroons | Western Association | Chicago, IL |
| Martin Duke | duke--002mar | 1888 | 4/22-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Martin Duke | duke--002mar | 1888 | 9/19-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Duncannon | 1888 | 6/6 | Camden | PhilReg | Camden, NJ | ||
| Ed Dundon | dundon001ed- | 1888 | 5/1-8/6 | Syracuse Stars | International Association | Syracuse, NY | |
| Ed Dundon | dundon001ed- | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | |
| Ed Dundon | dundon001ed- | 1888 | 8/23-9/2 | Columbus Senators | Tri-State League | Columbus, OH | |
| Sam Dungan | dungan001sam | 1888 | Los Angeles | s-p | Los Angeles, CA | ||
| Fred Dunlap | dunlap002fre | 1888 | 82 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Andrew Dunn | dunn--001and | 1888 | 4/9-4/16 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Andrew Dunn | dunn--001and | 1888 | 5/1-6/21 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| George Dunn | dunn--002geo | 1888 | 25 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| George Dunn | dunn--002geo | 1888 | 9/23-9/29 | 3 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| John Dunn | dunn--009joh | 1888 | 5/2-6/7 | 7 g. | Chicago Maroons | Western Association | Chicago, IL |
| John Dunn | dunn--009joh | 1888 | 6/20-7/2 | Lima Lushers | Tri-State League | Lima, OH | |
| John Dunn | dunn--009joh | 1888 | 7/15-9/5 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| John Dunn | dunn--010joh | 1888 | 4/24-6/6 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Steve Dunn | dunn--004ste | 1888 | 5/11-9/19+ | Albany Governors | International Association | Albany, NY | |
| Terrence Dunn | dunn--001ter | 1888 | 7/30-8/6 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Andy Dunning | dunnin001and | 1888 | 4/28-5/5 | Binghamton Crickets | Central League | Binghamton, NY | |
| Durdy | durdy-002--- | 1888 | 4/20-4/22 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Durell | 1888 | Princeton U. | College | , | |||
| Durell | 1888 | Cape May | Independent | Cape May, NJ | |||
| Charles Durmeyer | durmey001c-- | 1888 | 4/7-4/10 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Charles Durmeyer | durmey001c-- | 1888 | 4/24-4/30 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Jesse Duryea | duryea001jes | 1888 | 5/20-10/4 | 41 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Frank DuShane | dushan002--- | 1888 | no g. | Decatur | Central Interstate League | Decatur, IL | |
| Dick Dwyer | dwyer-001ric | 1888 | 5/4-5/7 | London Tecumsehs | International Association | London, ON | |
| Dick Dwyer | dwyer-001ric | 1888 | 8/30-9/1 | 2 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Frank Dwyer | dwyer-001fra | 1888 | Hobart College | College | , | ||
| Frank Dwyer | dwyer-001fra | 1888 | 5/1-9/8 | 57 g. | Chicago Maroons | Western Association | Chicago, IL |
| Frank Dwyer | dwyer-001fra | 1888 | 9/20- | 5 g. | Chicago | National League | Chicago, IL |
| Frank Dwyer | dwyer-001fra | 1888 | Hobart College | College | , | ||
| Thomas Dwyer | dwyer-004tho | 1888 | 4/23-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| James Dyer | dyer--004jam | 1888 | Meriden | Connecticut State League | Meridan, CT | ||
| William Dyson | dyson-001wil | 1888 | +6/1-6/26+ | Belleville | Eastern International League | Belleville, NJ | |
| Eagan | eagan-009--- | 1888 | 5/19-6/8 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Eagan | eagan-014--- | 1888 | 6/19 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Eagan | eagan-009--- | 1888 | 7/4-7/7 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Bill Eagan | eagan-001bil | 1888 | 5/5-6/20 | Camden | PhilReg | Camden, NJ | |
| Bill Eagan | eagan-001bil | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Howard Earl | earl--002how | 1888 | 4/28-8/9 | Salem Witches | New England League | Salem, MA | |
| Howard Earl | earl--002how | 1888 | 8/18-9/29 | Easton | Central League | Easton, PA | |
| Billy Earle | earle-001bil | 1888 | 4/28-10/4 | 88 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Harry East | east--001har | 1888 | St. Louis Kellogs | Independent | St. Louis, MO | ||
| Henry Easterday | easter001hen | 1888 | 115 g. | Kansas City | American Association | Kansas City, MO | |
| Jack Easton | easton001jac | 1888 | 4/26-8/29 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Jack Easton | easton001jac | 1888 | 9/1-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| Gus Eberle | eberle001gus | 1888 | Springfield | Independent | Springfield, MO | ||
| Hi Ebright | ebrigh001hi- | 1888 | 3/29- | 64 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Hi Ebright | ebrigh001hi- | 1888 | Jacksonville | Independent | Jacksonville, FL | ||
| Eddinger | edding001--- | 1888 | 4/8-4/17 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Jerry Eddinger | edinge001jer | 1888 | Seattle | Independent | Seattle, WA | ||
| Edward Egan | egan--002edw | 1888 | 4/23-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Eggert | 1888 | 5/5-5/26 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| C. Ehler | ehler-001c-- | 1888 | 5/2- | 11 g. | Decatur | Central Interstate League | Decatur, IL |
| Red Ehret | ehret-001phi | 1888 | 4/13-6/27 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Red Ehret | ehret-001phi | 1888 | 7/7- | 17 g. | Kansas City | American Association | Kansas City, MO |
| Robert Eilbeck | 1888 | 5/24-8/15 | Kingston | Eastern International League | Kingston, ON | ||
| Harry Eliff | eliff-001hen | 1888 | 5/2- | 16 g. | Decatur | Central Interstate League | Decatur, IL |
| Harry Eliff | eliff-001hen | 1888 | Bloomington Reds | Central Interstate League | Bloomington, IL | ||
| Elliott | elliot002--- | 1888 | 1 g. | Stockton | California League | Stockton, CA | |
| Ernest Ellis | ellis-001ern | 1888 | 5/2-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| Ezekiel Ellsworth | ellswo001eze | 1888 | 4/8 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Bones Ely | ely---001wil | 1888 | 4/28-9/19+ | Syracuse Stars | International Association | Syracuse, NY | |
| T. Emery | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| W. Emery | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Bob Emslie | emslie001bob | 1888 | 4/28-9/18+ | Umpire | Int | , | |
| George England | englan001geo | 1888 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | ||
| Dan Erek | ereck-001dan | 1888 | 4/28-5/12 | Albany Governors | International Association | Albany, NY | |
| William Erichson | erichs001wil | 1888 | 8/6 | Houston Babies | Texas-Southern League | Houston, TX | |
| George Ertelt | ertelt001geo | 1888 | 8/28-9/2 | Albany Governors | International Association | Albany, NY | |
| John Esmack | esmack001joh | 1888 | 6/30-9/15 | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Duke Esper | esper-001duk | 1888 | Philadelphia Quaker City | Independent | Philadelphia, PA | ||
| Dude Esterbrook | esterb001dud | 1888 | 64 g. | Indianapolis | National League | Indianapolis, IN | |
| Dude Esterbrook | esterb001dud | 1888 | 23 g. | Louisville | American Association | Louisville, KY | |
| Tony Esterquest | esterq001ant | 1888 | 29 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Tony Esterquest | esterq001ant | 1888 | 8/2-8/15 | Lima Lushers | Tri-State League | Lima, OH | |
| Charles Ettinger | etting001cha | 1888 | 5/19-8/2 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| C.W. Evans | evans-002c-- | 1888 | 5/19-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Jake Evans | evans-001jak | 1888 | Baltimore Reserves | Independent | Baltimore, MD | ||
| John Evans | evans-008joh | 1888 | New York Gorhams | Independent | New York, NY | ||
| Fred Ewald | ewald-001fre | 1888 | 4/28-6/2 | Scranton Miners | Central League | Scranton, PA | |
| Fred Ewald | ewald-001fre | 1888 | 6/19-8/2 | Binghamton Crickets | Central League | Binghamton, NY | |
| Buck Ewing | ewing-001buc | 1888 | 103 g. | New York | National League | New York, NY | |
| John Ewing | ewing-001joh | 1888 | 4/9-6/25 | Memphis Grays | Southern League | Memphis, TN | |
| John Ewing | ewing-001joh | 1888 | -10/1 | 21 g. | Louisville | American Association | Louisville, KY |
| Expert | 1888 | 7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Charles Faatz | faatz-001cha | 1888 | 27 g. | Hutchinson | Western League | Hutchinson, KS | |
| Charles Faatz | faatz-001cha | 1888 | 7/23-7/28 | Mansfield | Tri-State League | Mansfield, OH | |
| George Faatz | 1888 | St. Thomas | Amateur | St. Thomas, ON | |||
| Jay Faatz | faatz-001jay | 1888 | 120 g. | Cleveland | American Association | Cleveland, OH | |
| Henry Fabian | fabian001hen | 1888 | 4/1-5/5 | Galveston Giants | Texas League | Galveston, TX | |
| Henry Fabian | fabian001hen | 1888 | 5/8-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| Henry Fabian | fabian001hen | 1888 | 7/10-8/14 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Bill Fagan | fagan-001bil | 1888 | -7/20 | 18 g. | Kansas City | American Association | Kansas City, MO |
| Bill Fagan | fagan-001bil | 1888 | 8/29 | Troy Trojans | International Association | Troy, NY | |
| Frank Fahey | fahey-002fra | 1888 | 4/9-6/4 | Dallas Hams | Texas League | Dallas, TX | |
| John Fairhurst | fairhu001joh | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| John Fairhurst | fairhu001joh | 1888 | 8/9-9/26 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Faley | faley-001--- | 1888 | 6/6 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Faley | faley-001--- | 1888 | 6/9 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Jack Fanning | fannin001jac | 1888 | 4/30-9/15+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Randolph Faries | 1888 | U. of Pennsylvania | College | , | |||
| Bill Farmer | farmer002bil | 1888 | 5/1- | 2 g. | Pittsburgh | National League | Pittsburgh, PA |
| Bill Farmer | farmer002bil | 1888 | - 8/24 | 3 g. | Philadelphia | American Association | Philadelphia, PA |
| Farola | 1888 | 7 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Sid Farrar | farrar001sid | 1888 | 131 g. | Philadelphia | National League | Philadelphia, PA | |
| Farrell | 1888 | Poughkeepsie | HudsonRiv | Poughkeepsie, NY | |||
| Charles Farrell | farrel004cha | 1888 | Medford | Middlesex | Medford, MA | ||
| Duke Farrell | farrel002cha | 1888 | 4/21- | 64 g. | Chicago | National League | Chicago, IL |
| Jack Farrell | farrel002jac | 1888 | 103 g. | Baltimore | American Association | Baltimore, MD | |
| Joe Farrell | farrel001joe | 1888 | 51 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| James Farrington | farrin002jam | 1888 | 5/26 | Camden | PhilReg | Camden, NJ | |
| James Farrington | farrin002jam | 1888 | Camden | Independent | Camden, NJ | ||
| Jack Fee | fee---001jac | 1888 | Carbondale | Independent | Carbondale, PA | ||
| Jack Fee | fee---001jac | 1888 | 6/20-8/2 | Binghamton Crickets | Central League | Binghamton, NY | |
| Jack Fee | fee---001jac | 1888 | 8/6-9/6 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Jack Fee | fee---001jac | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| Fefel/Feifel | 1888 | 5/5-8/11 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Frank Fennelly | fennel001fra | 1888 | 120 g. | Cincinnati | American Association | Cincinnati, OH | |
| Frank Fennelly | fennel001fra | 1888 | 15 g. | Philadelphia | American Association | Philadelphia, PA | |
| Alex Ferson | ferson001ale | 1888 | 5/2-5/15 | 2 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Alex Ferson | ferson001ale | 1888 | 5/28-7/21 | Lynn Shoemakers | New England League | Lynn, MA | |
| Alex Ferson | ferson001ale | 1888 | 7/24-9/6 | Manchester Maroons | New England League | Manchester, NH | |
| Alex Ferson | ferson001ale | 1888 | 9/15-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Wally Fessenden | fessen001wal | 1888 | 4/28-8/3 | Salem Witches | New England League | Salem, MA | |
| Wally Fessenden | fessen001wal | 1888 | Umpire | WestA | , | ||
| Fidler | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Jim Field | field-001jim | 1888 | 4/28-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Jocko Fields | fields001joc | 1888 | 45 g. | Pittsburgh | National League | Pittsburgh, PA | |
| George Finke | finke-001geo | 1888 | Danville | Independent | Danville, PA | ||
| George Finke | finke-001geo | 1888 | Reading | Independent | Reading, PA | ||
| Edward Finn | 1888 | 5/5-7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Edward Finn | 1888 | 7/25-8/1 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Mike Finn | finn--002mic | 1888 | 3/29-12/1 | San Francisco Haverlys | California League | San Francisco, CA | |
| Finna | 1888 | Norwalk | Connecticut State League | Norwalk, CT | |||
| Michael Firle | firle-002mic | 1888 | 4/30-6/24 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| John Firth | firth-002joh | 1888 | 5/19-8/1 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Fischer | 1888 | Chicago Maroons | Western Association | Chicago, IL | |||
| Fish | fish--002--- | 1888 | 6/23 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Fisher | 1888 | Chester | Independent | Chester, PA | |||
| Fisher | 1888 | +6/5-7/11+ | Kingston | Eastern International League | Kingston, ON | ||
| Fisher | 1888 | 8/3 | Watertown | Eastern International League | Watertown, NY | ||
| Al Fisher | fisher001al- | 1888 | 53 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Al Fisher | fisher001al- | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Al Fisher | fisher001al- | 1888 | 8/10-8/14 | 4 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Al Fisher | fisher001al- | 1888 | 8/25-9/30 | 25 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Elmer Fisher | 1888 | 6/2 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Harry Fisher | fisher008har | 1888 | 9/20-9/22 | Hamilton Hams | International Association | Hamilton, ON | |
| Mike Fisher | fisher001mik | 1888 | 7 g. | Sacramento | California State League | Sacramento, CA | |
| Walter Fisher | fisher007cha | 1888 | 6/5 | Albany Governors | International Association | Albany, NY | |
| Frank Fitch | fitch-002fra | 1888 | Lansing | Independent | Lansing, MI | ||
| Fitzgerald | fitzge027--- | 1888 | Waterbury | Connecticut State League | Waterbury, CT | ||
| Dennis Fitzgerald | fitzge002den | 1888 | 4/23-6/16 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Dennis Fitzgerald | fitzge002den | 1888 | 7/4-7/6 | Lima Lushers | Tri-State League | Lima, OH | |
| Dennis Fitzgerald | fitzge002den | 1888 | 8/2-9/1 | London Tecumsehs | International Association | London, ON | |
| Dennis Fitzgerald | fitzge002den | 1888 | 4/30-6/2 | Elmira | Central League | Elmira, NY | |
| Dennis Fitzgerald | fitzge002den | 1888 | 6/30-8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| John Fitzgerald | fitzge006joh | 1888 | 4/28-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Warren Fitzgerald | fitzge001war | 1888 | Leadville Blues | Independent | Leadville, CO | ||
| Fitzpatrick | fitzpa017--- | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Fitzpatrick | fitzpa002--- | 1888 | 7/7-7/14 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Fitzpatrick | 1888 | Chester | Independent | Chester, PA | |||
| Fitzsimmons | fitzsi008--- | 1888 | +6/14+ | Marion | Indiana State League | Marion, IN | |
| John Fitzsimmons | fitzsi001joh | 1888 | 4/24-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| John Fitzsimmons | fitzsi002joh | 1888 | 4/24-4/27 | Mansfield | Tri-State League | Mansfield, OH | |
| Orlando Fitzsimmons | fitzsi001o-- | 1888 | 5/4-6/8 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| G.H. Flagg | flagg-002g-- | 1888 | 1 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| G.W. Flagg | flagg-003g-- | 1888 | 7/24-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Henry Flagg | flagg-001hen | 1888 | no g. | Ashland | Central Pennsylvania League | Ashland, PA | |
| Pat Flaherty | flaher005pat | 1888 | 3/30-6/27 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Pat Flaherty | flaher005pat | 1888 | 7/14-7/16 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Pat Flaherty | flaher005pat | 1888 | 7/17-7/20 | Umpire | Tx-So | , | |
| Pat Flaherty | flaher005pat | 1888 | 8/2-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| Pat Flaherty | flaher003pat | 1888 | 6/24-7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Flanagan | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Ed Flanagan | flanag001ed- | 1888 | 4/28-9/7 | Worcester Grays | New England League | Worcester, MA | |
| Thomas Flanagan | flanag001tho | 1888 | 4/27-9/21 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Joe Fleishman | fleish001joe | 1888 | 6/12-7/4 | Oswego | Eastern International League | Oswego, NY | |
| Joe Fleishman | fleish001joe | 1888 | 7/- | 27 g. | Auburn Yankees | Central New York League | Auburn, NY |
| Flinn | 1888 | Burlington | Independent | Burlington, NJ | |||
| Russell Flint | 1888 | 1 g. | Sacramento | California State League | Sacramento, CA | ||
| Silver Flint | flint-001sil | 1888 | 22 g. | Chicago | National League | Chicago, IL | |
| Flood | flood-002--- | 1888 | 5/9-8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| Thomas Flood | flood-001tho | 1888 | 3/30-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Thomas Flood | flood-001tho | 1888 | 7/10-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| Thomas Flood | flood-002tho | 1888 | 5/16-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | |
| Flowers | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Flynn | 1888 | 6 g. | Oakland Clevelands | California State League | Oakland, CA | ||
| Flynn | flynn-020--- | 1888 | 6/17 | 1 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Charles Flynn | flynn-001cha | 1888 | 5/1-7/27 | Peoria Reds | Central Interstate League | Peoria, IL | |
| Daniel Flynn | flynn-001joc | 1888 | 4/1-5/27 | Stockton | California League | Stockton, CA | |
| Daniel Flynn | flynn-001joc | 1888 | 8/18 | Oakland Greenhood & Morans | California League | Oakland, CA | |
| Ed Flynn | flynn-001ed- | 1888 | 4/28-5/7 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Ed Flynn | flynn-001ed- | 1888 | 5/11-6/4 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| James Flynn | flynn-005jam | 1888 | 4/8-5/5 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| James Flynn | flynn-005jam | 1888 | 5/7-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| James Flynn | flynn-005jam | 1888 | 6/16-9/10 | Buffalo Bisons | International Association | Buffalo, NY | |
| Jocko Flynn | flynn-001joc | 1888 | 4/30-7/4 | 16 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Jack Fogarty | fogart001jac | 1888 | 4/7-4/13 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Jim Fogarty | fogart001jim | 1888 | 121 g. | Philadelphia | National League | Philadelphia, PA | |
| John Fogarty | fogart002joh | 1888 | 4/7-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| John Fogarty | fogart002joh | 1888 | 7/10-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Foley | foley-010--- | 1888 | Nashua | New England Interstate League | Nashua, NH | ||
| Foley | 1888 | 1 g. | San Francisco Emersons | California State League | San Francisco, CA | ||
| J. Forbes | forbes002--- | 1888 | Cuban Giants | Independent | Cuban, | ||
| Davy Force | force-001dav | 1888 | 4/7-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Davy Force | force-001dav | 1888 | 7/4-10/1 | 66 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Ford | ford--007--- | 1888 | 1 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Ford | 1888 | Princeton U. | College | , | |||
| Ford | 1888 | Cape May | Independent | Cape May, NJ | |||
| L.J. Ford | ford--001l-- | 1888 | 11 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Lawrence Ford | ford--001law | 1888 | 5/9 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Tom Ford | ford--003w-- | 1888 | 5/8-5/9 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Tom Ford | ford--001tom | 1888 | 5/16 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Tom Ford | ford--001tom | 1888 | 6/16-6/23 | Mansfield | Tri-State League | Mansfield, OH | |
| Frank Foreman | forema001fra | 1888 | 4/28-9/19+ | Albany Governors | International Association | Albany, NY | |
| Tom Forster | forste001tom | 1888 | 4/28-8/9 | 80 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Tom Forster | forste001tom | 1888 | 8/25-9/30 | 24 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Elmer Foster | foster001elm | 1888 | 37 g. | New York | National League | New York, NY | |
| Frank Foulkrod | foulkr001fra | 1888 | 4/28-8/13 | Allentown Peanuts | Central League | Allentown, PA | |
| Henry Fountain | 1888 | 6/16 | MLB Umpire | American Association | , | ||
| Henry Fournier | fourni001hen | 1888 | Utica | Independent | Utica, NY | ||
| Dave Foutz | foutz-001dav | 1888 | 140 g. | Brooklyn | American Association | Brooklyn, NY | |
| Fowler | fowler013--- | 1888 | 4/7 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Bud Fowler | fowler004joh | 1888 | 53 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Bud Fowler | fowler004joh | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Bud Fowler | fowler004joh | 1888 | 22 g. | Santa Fe | NM | Santa Fe, NM | |
| Frank | frank-007--- | 1888 | 8/31 | Easton | Central League | Easton, PA | |
| Franks | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Fredericks | 1888 | 5/9-8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Freeman | freema004--- | 1888 | Newton | Western League | Newton, KS | ||
| Julie Freeman | freema001jul | 1888 | Spring Training | Kansas City Blues | Western Association | Kansas City, MO | |
| Julie Freeman | freema001jul | 1888 | 10/10 | 1 g. | St. Louis Browns | American Association | St. Louis, MO |
| William Freeman | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| William Frey | frey--002wil | 1888 | 4/22-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Frick | 1888 | 5/30-6/7 | Watertown | Eastern International League | Watertown, NY | ||
| Friel | friel-002--- | 1888 | 7/4 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Pat Friel | friel-001pat | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Frink | 1888 | 1 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Frost | 1888 | 1 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Fry | fry---001--- | 1888 | 5/16-7/21 | Chester Houston | PhilReg | Chester, PA | |
| Fry | 1888 | 5/26-8/4 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| John Frye | frye--003joh | 1888 | Cuban Giants | Independent | Cuban, | ||
| Frank Fudger | fudger001fre | 1888 | 4/7-6/22 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Frank Fudger | fudger001fre | 1888 | 7/17-8/31 | 11 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Andy Fuller | fuller002and | 1888 | Lincoln Tree Planters | Western League | Lincoln, NE | ||
| Andy Fuller | fuller002and | 1888 | Waco | Independent | Waco, TX | ||
| Billy Fuller | fuller002wil | 1888 | 5/2-10/7 | 67 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Harry Fuller | fuller003har | 1888 | 4/23-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| Shorty Fuller | fuller001sho | 1888 | 4/7-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Shorty Fuller | fuller001sho | 1888 | 7/11-7/13 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Shorty Fuller | fuller001sho | 1888 | 7/19- | 49 g. | Washington | National League | Washington, DC |
| Chris Fulmer | fulmer001chr | 1888 | 52 g. | Baltimore | American Association | Baltimore, MD | |
| Bill Furlong | furlon002wil | 1888 | 7/17 | MLB Umpire | National League | , | |
| Eddie Fusselback | fussel001edd | 1888 | 4/28-6/5 | Portland | New England League | Portland, ME | |
| Eddie Fusselback | fussel001edd | 1888 | 6/6-7/20 | Worcester Grays | New England League | Worcester, MA | |
| Eddie Fusselback | fussel001edd | 1888 | 8/28 | 1 g. | Louisville | American Association | Louisville, KY |
| John Gaffney | gaffne002joh | 1888-89 | 229 g. | MLB Umpire | American Association | , | |
| Matt Gagen | gagen-001mat | 1888 | Louisville Deppens | Amat | Louisville, KY | ||
| Gallagher | 1888 | 6/29-8/11 | Kingston | Eastern International League | Kingston, ON | ||
| Gallagher | 1888 | 3 g. | Waterloo | Central New York League | Waterloo, NY | ||
| James Galligan | gallig001jam | 1888 | 5/17-7/24 | Easton | Central League | Easton, PA | |
| John Galligan | gallig001joh | 1888 | 4/28-9/29 | Scranton Miners | Central League | Scranton, PA | |
| Pete Galligan | gallag002jim | 1888 | 5/17-5/24 | 5 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Pete Galligan | gallag002jim | 1888 | 6/19 | 1 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Pete Galligan | gallag002jim | 1888 | 7/12-7/28 | 10 g. | Chicago Maroons | Western Association | Chicago, IL |
| Pete Galligan | gallag002jim | 1888 | 10/4-10/7 | 4 g. | Chicago Maroons | Western Association | Chicago, IL |
| Pud Galvin | galvin001pud | 1888 | 50 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Bob Gamble | gamble001bob | 1888 | Philadelphia Reserves | Independent | Philadelphia, PA | ||
| Bob Gamble | gamble001bob | 1888 | 5/2 | 1 g. | Philadelphia | American Association | Philadelphia, PA |
| Bob Gamble | gamble001bob | 1888 | Harrisburg | Independent | Harrisburg, PA | ||
| Bob Gamble | gamble001bob | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Bob Gamble | gamble001bob | 1888 | 8/9-9/6 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Pete Gandolfo | gandol001p-- | 1888 | 8 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Jack Gans | gans--001jac | 1888 | +6/14+ | Marion | Indiana State League | Marion, IN | |
| Charlie Ganzel | ganzel002cha | 1888 | 95 g. | Detroit | National League | Detroit, MI | |
| George Ganzel | ganzel001geo | 1888 | +6/29+ | Winnipeg | Independent | Winnipeg, MB | |
| Wilbur Gard | gard--000wil | 1888 | +6/7+ | Frankfort | Indiana State League | Frankfort, IN | |
| Gardner | gardne034--- | 1888 | 6/25-7/10 | Easton | Central League | Easton, PA | |
| Gardner | 1888 | 6/25 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Bill Gardner | gardne002bil | 1888 | Baltimore Reserves | Independent | Baltimore, MD | ||
| Gid Gardner | gardne001gid | 1888 | 2 g. | Washington | National League | Washington, DC | |
| Gid Gardner | gardne001gid | 1888 | 1 g. | Philadelphia | National League | Philadelphia, PA | |
| Gid Gardner | gardne001gid | 1888 | 7/12-7/13 | Meriden | Connecticut State League | Meriden, CT | |
| Bill Garfield | garfie001bil | 1888 | Oberlin College | College | , | ||
| Bill Garfield | garfie001bil | 1888 | 5/7-9/25 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Ed Gastfield | gastfi001ed- | 1888 | 5/5-5/30 | 8 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Hank Gastright | gastri001han | 1888 | 4/23-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| E.M. Gates | gates-001e-- | 1888 | 7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| W.T. Gates | gates-001w-- | 1888 | 7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Mike Gaule | gaule-001mik | 1888 | 5/23 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Charles Gaunt | gaunt-001cha | 1888 | Staten Island | Independent | Staten Island, NY | ||
| Geary | geary-002--- | 1888 | 5/23-5/28 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Geary | geary-004--- | 1888 | 6/8-6/9 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| George Geer | geer--001geo | 1888 | +6/4-6/18+ | Watertown | Eastern International League | Watertown, NY | |
| George Geer | geer--001geo | 1888 | Ithaca | Independent | Ithaca, NY | ||
| Charlie Geggus | geggus001cha | 1888 | 3/29- | 61 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Bill Geiss | geiss-001bil | 1888 | 6/30-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Emil Geiss | geiss-001emi | 1888 | 4/28-9/27 | London Tecumsehs | International Association | London, ON | |
| Elmer Geist | 1888 | 7/14-9/1 | 4 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA | |
| Frank Genins | genins001c-- | 1888 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | ||
| Frank Genins | genins001c-- | 1888 | 7/4-10/1 | 73 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Gentleman | gentle002--- | 1888 | 5/14- | Haverhill | New England Interstate League | Haverhill, MA | |
| Gentleman | gentle002--- | 1888 | +6/16-6/25+ | Watertown | Eastern International League | Watertown, NY | |
| William Gentleman | gentle001wil | 1888 | 5/5-7/9 | Troy Trojans | International Association | Troy, NY | |
| Bill George | george001bil | 1888 | 9 g. | New York | National League | New York, NY | |
| Joe Gerhardt | gerhar001joe | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Frank German | 1888 | 6/30-9/15 | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Frank German | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Les German | german001les | 1888 | 5/15-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| Charlie Gessner | gessne001cha | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Charlie Gessner | gessne001cha | 1888 | 8/9-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Tom Gettinger | gettin001tom | 1888 | 5/19-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Tom Gettinger | gettin001tom | 1888 | 8/3-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Pretzels Getzien | getzie001pre | 1888 | 46 g. | Detroit | National League | Detroit, MI | |
| Charles Gibbs | gibbs-001cha | 1888 | 5/12-9/17+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Gibson | gibson002--- | 1888 | 5/19-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Whitey Gibson | gibson001whi | 1888 | Philadelphia Reserves | Independent | Philadelphia, PA | ||
| Whitey Gibson | gibson001whi | 1888 | 5/2 | 1 g. | Philadelphia | American Association | Philadelphia, PA |
| Whitey Gibson | gibson001whi | 1888 | Portland | Independent | Portland, ME | ||
| Whitey Gibson | gibson001whi | 1888 | 6/4 | Portland | New England League | Portland, ME | |
| Whitey Gibson | gibson001whi | 1888 | 6/6-7/11 | Salem Witches | New England League | Salem, MA | |
| E. A. Gifford | 1888 | ?-9/15 | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Pete Gilbert | gilber001pet | 1888 | Norfolk | Independent | Norfolk, VA | ||
| Bob Gilks | gilks-001rob | 1888 | 119 g. | Cleveland | American Association | Cleveland, OH | |
| Gill | gill--020--- | 1888 | 5/12-5/? | Nashua | New England Interstate League | Nashua, NH | |
| Gill | gill--020--- | 1888 | Umpire | NE | , | ||
| Gill | 1888 | FIND | Independent | , | |||
| Gill | 1888 | 5/26-6/6..7/4 | Umpire | NE | , | ||
| Gill | gill--008--- | 1888 | 6/27 | Easton | Central League | Easton, PA | |
| Jim Gill | gill--001jim | 1888 | 5/19-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Jim Gill | gill--001jim | 1888 | 8/15-8/17 | Allentown Peanuts | Central League | Allentown, PA | |
| Patrick Gillespie | gilles003pet | 1888 | 4/28-5/19 | Troy Trojans | International Association | Troy, NY | |
| Patrick Gillespie | gilles003pet | 1888 | 6/1-7/18 | Albany Governors | International Association | Albany, NY | |
| Barney Gilligan | gillig001bar | 1888 | 1 g. | Detroit | National League | Detroit, MI | |
| Barney Gilligan | gillig001bar | 1888 | 6/9-7/5 | Lynn Shoemakers | New England League | Lynn, MA | |
| Barney Gilligan | gillig001bar | 1888 | 9/4-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| James? Gilman | 1888 | Cleveland Stars | Independent | Cleveland, OH | |||
| Pit Gilman | gilman001pit | 1888 | 4/22-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Frank Gilmore | gilmor001fra | 1888 | -8/4 | 13 g. | Washington | National League | Washington, DC |
| Frank Gilmore | gilmor001fra | 1888 | 8/7-8/30 | Syracuse Stars | International Association | Syracuse, NY | |
| Billy Gimmell | gimmel001bil | 1888 | 5 g. | Oakland Tribunes | California State League | Oakland, CA | |
| Jack Glasscock | glassc001jac | 1888 | 113 g. | Indianapolis | National League | Indianapolis, IN | |
| Gleason | 1888 | 1 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Gleason | 1888 | 22 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Bill Gleason | gleaso002bil | 1888 | 123 g. | Philadelphia | American Association | Philadelphia, PA | |
| Kid Gleason | gleaso002wil | 1888 | 4/20- | 24 g. | Philadelphia | National League | Philadelphia, PA |
| Michael Gleason | gleaso001mic | 1888 | Syracuse | Independent | Syracuse, NY | ||
| Bob Glenalvin | glenal001bob | 1888 | 35 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Ed Glenn | glenn-001ed- | 1888 | 4/7-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Ed Glenn | glenn-001ed- | 1888 | -10/5 | 3 g. | Kansas City | American Association | Kansas City, MO |
| Ed Glenn | glenn-001ed- | 1888 | 20 g. | Boston | National League | Boston, MA | |
| Gloster | 1888 | 5/30-8/3 | Kingston | Eastern International League | Kingston, ON | ||
| Gockman | gockma002--- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| John Godar | godar-001joh | 1888 | 4/8-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| John Godar | godar-001joh | 1888 | 7/10-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| John Godar | godar-001joh | 1888 | 8/13-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| George Goetz | goetz-002geo | 1888 | Roanoke | Independent | Roanoke, VA | ||
| Tom Golden | golden002mik | 1888 | 11 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Tom Golden | golden001tho | 1888 | Aurora | Independent | Aurora, IL | ||
| Jake Goldie | goldst001j-- | 1888 | 1 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Jake Goldie | goldst001j-- | 1888 | 7 g. | Santa Cruz | California State League | Santa Cruz, CA | |
| Walt Goldsby | goldsb001wal | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Walt Goldsby | goldsb001wal | 1888 | -10/16 | 45 g. | Baltimore | American Association | Baltimore, MD |
| Fred Goldsmith | goldsm002fre | 1888-89 | -9/23 | 167 g. | MLB Umpire | American Association | , |
| George Goldstein | 1888 | no g. | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | ||
| Herb Goodall | goodal001her | 1888 | 4/30-9/26 | Elmira | Central League | Elmira, NY | |
| William Goodchild | goodch001wil | 1888 | 6/1-6/12 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Bill Goodenough | gooden001bil | 1888 | 3/30-4/22 | Galveston Giants | Texas League | Galveston, TX | |
| Bill Goodenough | gooden001bil | 1888 | 6/1-6/24 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Bill Goodenough | gooden001bil | 1888 | 7/3 | Dallas Hams | Texas League | Dallas, TX | |
| Bill Goodenough | gooden001bil | 1888 | 7/12-7/14 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Bill Goodenough | gooden001bil | 1888 | 7/28-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Mike Goodfellow | goodfe001mik | 1888 | -9/15 | 68 g. | Cleveland | American Association | Cleveland, OH |
| George Goodhart | goodha001geo | 1888 | Lancaster | Amat | Lancaster, PA | ||
| Tom Goodhart | goodha001tom | 1888 | Lancaster | Amat | Lancaster, PA | ||
| William Gooding | goodin001a-- | 1888 | 4/28-7/18 | Minneapolis Millers | Western Association | Minneapolis, MN | |
| Frank Goodryder | goodry000--- | 1888 | 5/30-8/14 | Kingston | Eastern International League | Kingston, ON | |
| Frank Goodryder | goodry000--- | 1888 | 4 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| Forrest Goodwin | goodwi002for | 1888 | Colby College | College | , | ||
| Forrest Goodwin | goodwi002for | 1888 | 4/28-8/3 | Salem Witches | New England League | Salem, MA | |
| Gordon | 1888 | 5/12-7/7 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Gordon | 1888 | 8/2-8/6 | Chester Houston | PhilReg | Chester, PA | ||
| George Gore | gore--001geo | 1888 | 64 g. | New York | National League | New York, NY | |
| Ed Gorman | gorman002ed- | 1888 | 5/16-6/29 | Albany Governors | International Association | Albany, NY | |
| Ed Gorman | gorman002ed- | 1888 | Bradford | Independent | Bradford, PA | ||
| Jack Gorman | gorman001jac | 1888 | 5/13- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Jack Gorman | gorman001jac | 1888 | 7/1-7/12 | 6 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Thomas Gorman | gorman004tho | 1888 | St. Louis | StL-Busi | St. Louis, MO | ||
| William Gourie | gourie001wil | 1888 | 5/7-5/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| William Gourie | gourie001wil | 1888 | 7/17-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | |
| Jack Grady | grady-000jac | 1888 | 4/28-5/19 | Lowell Chippies | New England League | Lowell, MA | |
| Jack Grady | grady-000jac | 1888 | 7/3-7/5 | Manchester Maroons | New England League | Manchester, NH | |
| Mike Grady | grady-002mic | 1888 | Wilmington Brownson | Independent | Wilmington, | ||
| Patrick Grady | grady-002pat | 1888 | Dover | New England Interstate League | Dover, DE | ||
| Patrick Grady | grady-002pat | 1888 | 6/8-7/4 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Frank Graff | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Frank Graff | 1888 | Cape May | Independent | Cape May, NJ | |||
| John Graff | graff-001joh | 1888 | 6/1-8/3 | Albany Governors | International Association | Albany, NY | |
| E. W. Graham | 1888 | 5/12-? | Dover | New England Interstate League | Dover, DE | ||
| James Graham | graham001jam | 1888 | Philadelphia Frankford | Independent | Philadelphia, PA | ||
| James? Graham | 1888 | 5/9-8/9 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Frank Grant | grant-001fra | 1888 | 4/28-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Michael Granville | granvi001mic | 1888 | +5/29+ | Lafayette | Indiana State League | Lafayette, IN | |
| Michael Granville | granvi001mic | 1888 | 7 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Charles Graul | graul-001cha | 1888 | 5/5-8/6 | Chester Houston | Independent | Chester, PA | |
| Billy Graulich | grauli001lew | 1888 | 6/2-8/14 | Norristown | PhilReg | Norristown, PA | |
| Lew Graulich | grauli001wil | 1888 | 5/9-6/2 | Chester Houston | PhilReg | Chester, PA | |
| Lew Graulich | grauli001wil | 1888 | 6/8-6/14 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Lew Graulich | grauli001wil | 1888 | 6/20-8/6 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Frank Graves | graves004fra | 1888 | 4/30-5/15 | 6 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Frank Graves | graves004fra | 1888 | 5/25-7/4 | Buffalo Bisons | International Association | Buffalo, NY | |
| Frank Graves | graves004fra | 1888 | 7/29-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Gray | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Gray | gray--061--- | 1888 | +5/29+ | Lafayette | Indiana State League | Lafayette, IN | |
| Jim Gray | gray--001jim | 1888 | 5/30-6/1 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Ed Green | green-002ed- | 1888 | 4/30-9/3 | Hamilton Hams | International Association | Hamilton, ON | |
| Jim Green | green-001jim | 1888 | 4/23-9/6 | Mansfield | Tri-State League | Mansfield, OH | |
| John Greenig | greeni001joh | 1888 | 5/9 | 1 g. | Washington | National League | Washington, DC |
| John Greenig | greeni001joh | 1888 | 5/31-6/6 | Galveston Giants | Texas League | Galveston, TX | |
| John Greenig | greeni001joh | 1888 | 4 g. | Philadelphia Kensington | Independent | Philadelphia, PA | |
| Greenwald | 1888 | Chester | Independent | Chester, PA | |||
| Whiting Greenwald | greenw001whi | 1888 | 5/5-5/23 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| Bill Greenwood | greenw001bil | 1888 | 115 g. | Baltimore | American Association | Baltimore, MD | |
| Ed Greer | greer-001ed- | 1888 | 4/28-6/9 | Toronto Canucks | International Association | Toronto, ON | |
| Mike Griffin | griffi001mik | 1888 | 137 g. | Baltimore | American Association | Baltimore, MD | |
| Sandy Griffin | griffi001san | 1888 | 4/28-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Clark Griffith | griffi003cla | 1888 | 20 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Clark Griffith | griffi003cla | 1888 | 7/8-10/7 | 29 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| John Grim | grim--002joh | 1888 | 33 g. | Danville Browns | Central Interstate League | Danville, IL | |
| John Grim | grim--002joh | 1888 | 7/12-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| John Grim | grim--002joh | 1888 | 9/29- | 2 g. | Philadelphia | National League | Philadelphia, PA |
| Grimes | 1888 | 4 g. | San Francisco Emersons | California State League | San Francisco, CA | ||
| Henry Gruber | gruber001hen | 1888 | 27 g. | Detroit | National League | Detroit, MI | |
| Fred Grumbling | grumbl001fre | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Fred Grumbling | grumbl001fre | 1888 | 6/11-7/24 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Gucked | 1888 | 7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| John Guehrer | guehre001joh | 1888 | 4/22-6/1 | Galveston Giants | Texas League | Galveston, TX | |
| Thomas Guest | guest-002tho | 1888 | 4/28-7/25 | Waterbury | Connecticut State League | Waterbury, CT | |
| Louis Guinasso | guinas001lou | 1888 | 5/1-9/4 | Lowell Chippies | New England League | Lowell, MA | |
| Ad Gumbert | gumber001ad- | 1888 | 4/23-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Ad Gumbert | gumber001ad- | 1888 | 9/15- | 7 g. | Chicago | National League | Chicago, IL |
| Billy Gumbert | gumber001bil | 1888 | 4/26-9/26 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Tom Gunning | gunnin001tom | 1888 | 23 g. | Philadelphia | American Association | Philadelphia, PA | |
| John Gunshannon | gunsha001joh | 1888 | 4/28-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| Joe Gunson | gunson001joe | 1888 | 5/5-10/9 | 59 g. | Kansas City Blues | Western Association | Kansas City, MO |
| William Gurnett | gurnet001wil | 1888 | 3/29- | 16 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| Charlie Hackett | hacket001cha | 1888 | 4/28-9/29 | Syracuse Stars | International Association | Syracuse, NY | |
| Mert Hackett | hacket001mer | 1888 | Boston | Amat | Boston, MA | ||
| Mert Hackett | hacket001mer | 1888 | 7/14-8/2 | Troy Trojans | International Association | Troy, NY | |
| Walter Hackett | hacket001wal | 1888 | 4/28-8/11 | Troy Trojans | International Association | Troy, NY | |
| Haddock | 1888 | Baltimore Reserves | Independent | Baltimore, MD | |||
| George Haddock | haddoc001geo | 1888 | 4/28-9/18+ | Troy Trojans | International Association | Troy, NY | |
| George Haddock | haddoc001geo | 1888 | 9/27- | 2 g. | Washington | National League | Washington, DC |
| Hadley | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Jimmy Haffey | haffy-001jam | 1888 | 5/19-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Frank Hafner | hafner001fra | 1888 | 5/5- | 2 g. | Kansas City | American Association | Kansas City, MO |
| Hagan | hagan-002--- | 1888 | 6/13 | Easton | Central League | Easton, PA | |
| W. Hageman | hagema001--- | 1888 | 8/30-9/19 | Troy Trojans | International Association | Troy, NY | |
| Alf Hagerman | hagerm001alf | 1888 | 11 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Bill Hague | hague-001bil | 1888 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Ed Halbriter | halbri001ed- | 1888 | 1 g. | Seneca Falls | Central New York League | Seneca Falls, NY | |
| John Haley | haley-006joh | 1888 | Nashua | New England Interstate League | Nashua, NH | ||
| Hall | 1888 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |||
| Hall | 1888 | Philadelphia Germantown | PhilReg | Philadelphia, PA | |||
| Hall | hall--002--- | 1888 | 9/23 | 2 g. | Chicago Maroons | Western Association | Chicago, IL |
| C. Hall | hall--000c-- | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Charles Hall | hall--012cha | 1888 | 5/30-6/15 | Elmira | Central League | Elmira, NY | |
| James Hall | hall--041--- | 1888 | Las Vegas | Independent | Las Vegas, TX | ||
| Jocko Halligan | hallig001joc | 1888 | 5/3-7/4 | Binghamton Crickets | Central League | Binghamton, NY | |
| Jocko Halligan | hallig001joc | 1888 | 7/10 | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Jocko Halligan | hallig001joc | 1888 | 7/13-9/15 | Penn Yan | Central New York League | Penn Yan, NY | |
| Bill Hallman | hallma002wil | 1888 | 4/23- | 18 g. | Philadelphia | National League | Philadelphia, PA |
| Richard Halloran | hallor001ric | 1888 | 4/28-6/2 | Scranton Miners | Central League | Scranton, PA | |
| Charlie Hallstrom | hallst001cha | 1888 | 5/31-6/21 | 6 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Charlie Hallstrom | hallst001cha | 1888 | 7/4-7/28 | Lima Lushers | Tri-State League | Lima, OH | |
| Jim Halpin | halpin001jim | 1888 | 4/28-9/19+ | Albany Governors | International Association | Albany, NY | |
| John Halpin | halpin002joh | 1888 | 8/17-8/21 | 4 g. | Chicago Maroons | Western Association | Chicago, IL |
| Halsinger | halsin001--- | 1888 | 5/5-6/2 | Camden | PhilReg | Camden, NJ | |
| Halsinger | halsin001--- | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Charlie Hamburg | hambur003cha | 1888 | 4/28-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Billy Hamilton | hamilt006wil | 1888 | 4/28-7/28 | Worcester Grays | New England League | Worcester, MA | |
| Billy Hamilton | hamilt006wil | 1888 | 7/31- | 35 g. | Kansas City | American Association | Kansas City, MO |
| Robert Hamilton | hamilt006rob | 1888 | 4/22-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Sandy Hamilton | hamilt001ale | 1888 | +6/30+ | Weir City | Independent | Weir City, KS | |
| Hammel | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Hammell | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| E. Hammer | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Hancock | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Jack Handiboe | handib001j-- | 1888 | 4/25-9/22 | Columbus Senators | Tri-State League | Columbus, OH | |
| Jim Handiboe | handib001jim | 1888 | 4/23-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Frank Hankinson | hankin001fra | 1888 | 37 g. | Kansas City | American Association | Kansas City, MO | |
| George Hanley | hanley001geo | 1888 | 3/29- | 65 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Ned Hanlon | hanlon001ned | 1888 | 109 g. | Detroit | National League | Detroit, MI | |
| Hannifin | hannif003--- | 1888 | 5/2-5/12 | Binghamton Crickets | Central League | Binghamton, NY | |
| William Hanrahan | hanrah002wil | 1888 | 5/1-9/23 | 110 g. | Chicago Maroons | Western Association | Chicago, IL |
| Hantel | hantel001--- | 1888 | 4/14-5/21 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Albert Hapeman | hapema001alb | 1888 | Las Cruces | NMSt | Las Cruces, | ||
| Lou Hardie | hardie001lou | 1888 | 3/31- | 56 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| John Harkins | harkin002joh | 1888 | 1 g. | Baltimore | American Association | Baltimore, MD | |
| John Harkins | harkin002joh | 1888 | Bound Brook | Independent | Bound Brook, NJ | ||
| Ray Harkness | harkne001ray | 1888 | 9 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Ray Harkness | harkne001ray | 1888 | 7/8 | 1 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| James Harmon | harmon002jam | 1888 | 6/20-7/4 | Oswego | Eastern International League | Oswego, NY | |
| James Harmon | harmon001jam | 1888 | 7/5-10-8/4 | Canton Nadjys | Tri-State League | Canton, OH | |
| George Harper | harper003joh | 1888 | 4/7- | 15 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| George Harper | harper003joh | 1888 | 12 g. | Stockton | California League | Stockton, CA | |
| Harrigan | 1888 | 5/30-6/2 | Oswego | Eastern International League | Oswego, NY | ||
| Harrigan | 1888 | 17 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Jerry Harrington | harrin001jer | 1888 | 5/2- | Decatur | Central Interstate League | Decatur, IL | |
| Jerry Harrington | harrin001jer | 1888 | 35 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Jerry Harrington | harrin001jer | 1888 | Davenport | Central Interstate League | Davenport, IA | ||
| William Harrington | harrin005wil | 1888 | 6/25 | Lima Lushers | Tri-State League | Lima, OH | |
| Harris | harris112--- | 1888 | 6/1-6/16 | Oswego | Eastern International League | Oswego, NY | |
| Harris | harris005--- | 1888 | 4/28-5/24 | Binghamton Crickets | Central League | Binghamton, NY | |
| Harris | harris005--- | 1888 | 6/6-6/30 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Harris | harris005--- | 1888 | 7/4-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Frank Harris | harris005fra | 1888 | Hastings | Independent | Hastings, NE | ||
| Hank Harris | harris001hen | 1888 | 3/29-12/1 | San Francisco Haverlys | California League | San Francisco, CA | |
| Harrison | 1888 | 5/26-8/11 | Norristown | PhilReg | Norristown, PA | ||
| Harrison | harris027--- | 1888 | 7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Abe Harrison | harris001abr | 1888 | Cuban Giants | Independent | Cuban, | ||
| Bill Hart | hart--004wil | 1888 | 5/22-8/10 | Buffalo Bisons | International Association | Buffalo, NY | |
| Billy Hart | hart--002bil | 1888 | +7/4-7/23+ | South Bend | Indiana State League | South Bend, IN | |
| Billy Hart | hart--002bil | 1888 | 9/8-9/26 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Jim Hart | hart--008jam | 1888 | 4/28-10/9 | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI | |
| George Harter | harter001geo | 1888 | 5/1 - | 38 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| George Harter | harter001geo | 1888 | 8/10-8/24 | Mansfield | Tri-State League | Mansfield, OH | |
| Fred Hartman | hartma003fre | 1888 | McKeesport | Independent | McKeesport, PA | ||
| Jacob Hartmeyer | hartme001jac | 1888 | 4/26 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Pat Hartnett | hartne001pat | 1888 | 4/28-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| Pete Hasney | hasney001pet | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Pete Hasney | hasney001pet | 1888 | 8/9-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Bill Hassamaer | hassam001bil | 1888 | 5/1-10/9 | 101 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Christy Hassett | hasset001chr | 1888 | 5/2-5/19 | London Tecumsehs | International Association | London, ON | |
| Christy Hassett | hasset001chr | 1888 | 5/28-5/29 | Buffalo Bisons | International Association | Buffalo, NY | |
| Christy Hassett | hasset001chr | 1888 | 7/6-7/14 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Christy Hassett | hasset001chr | 1888 | 7/30-8/16 | Easton | Central League | Easton, PA | |
| Gil Hatfield | hatfie001gil | 1888 | 28 g. | New York | National League | New York, NY | |
| Hauffer | 1888 | Burlington | Independent | Burlington, NJ | |||
| Bill Hawes | hawes-001bil | 1888 | 4/30-8/14 | 78 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Bill Hawes | hawes-001bil | 1888 | 8/16-10/3 | 41 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| George Hayes | hayes-002geo | 1888 | 4/30-7/20 | Rochester Jingoes | International Association | Rochester, NY | |
| Jack Hayes | hayes-003jac | 1888 | 4/7- | 18 g. | Stockton | California League | Stockton, CA |
| Jack Hayes | hayes-003jac | 1888 | 4/29- | 35 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Jackie Hayes | hayes-001jac | 1888 | 6/5-8/20 | Scranton Miners | Central League | Scranton, PA | |
| John Hayes | 1888 | 5 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| John Healey | healey005joh | 1888 | 5/20-6/2 | 2 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Healy | healy-002--- | 1888 | 5 g. | Peoria Reds | Central Interstate League | Peoria, IL | |
| Egyptian Healy | healy-001egy | 1888 | 37 g. | Indianapolis | National League | Indianapolis, IN | |
| Hank Hearn | hurn--001--- | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| W. Heberling | heberl001w-- | 1888 | Rochester Danfords | Independent | Rochester, NY | ||
| Guy Hecker | hecker001guy | 1888 | 56 g. | Louisville | American Association | Louisville, KY | |
| Heffner | heffne003--- | 1888 | 6 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Michael Heffron | heffro001mic | 1888 | 5/16 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Heinbo | heinbo000--- | 1888 | +6/14+ | Marion | Indiana State League | Marion, IN | |
| Bill Heine | heine-001wil | 1888 | 12 g. | Penn Yan | Central New York League | Penn Yan, NY | |
| Bill Heine | heine-001wil | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | |
| Bill Heine | heine-001wil | 1888 | 3 g. | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Bill Heine | heine-001wil | 1888 | 6/16-9/29 | Elmira | Central League | Elmira, NY | |
| Hellman | 1888 | Burlington | Independent | Burlington, NJ | |||
| Tony Hellman | hellma001ton | 1888 | 4/16-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Tony Hellman | hellma001ton | 1888 | 7/29-8/10 | Columbus Senators | Tri-State League | Columbus, OH | |
| George Hemming | hemmin002geo | 1888 | Carrollton | Independent | Carrollton, OH | ||
| Ducky Hemp | hemp--001duc | 1888 | 4/7-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| Ducky Hemp | hemp--001duc | 1888 | 7/10-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| William Hendershott | hender011wil | 1888 | 2 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Don Henderson | 1888 | Belleville | Eastern International League | Belleville, NJ | |||
| Don Henderson | 1888 | Brockville | Eastern International League | Brockville, ON | |||
| Hardie Henderson | hender004har | 1888 | 5 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Hendrickson | hendri004--- | 1888 | 11 g. | Rockford | Central Interstate League | Rockford, IL | |
| Ed Hengel | hengle001edw | 1888 | Umpire | So | , | ||
| Ed Hengel | hengle001edw | 1888 | 8/7-8/27 | Umpire | Int | , | |
| Moxie Hengel | hengle001mox | 1888 | 5/1-10/5 | 105 g. | Chicago Maroons | Western Association | Chicago, IL |
| Hennessey | hennes012--- | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| Hennessey | hennes012--- | 1888 | Marion | Indiana State League | Marion, IN | ||
| Hennessey | hennes004--- | 1888 | 9/10-9/21 | Mansfield | Tri-State League | Mansfield, OH | |
| Hennessy | 1888 | 4/16- | Covington | Independent | Covington, KY | ||
| Henry | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| George Henry | henry-002geo | 1888 | 5/1-5/25 | Worcester Grays | New England League | Worcester, MA | |
| John Henry | henry-007joh | 1888 | 4/28-9/3 | Salem Witches | New England League | Salem, MA | |
| John Henry | henry-009joh | 1888 | Easton | Central League | Easton, PA | ||
| John Henry | henry-009joh | 1888 | 8/24-8/25 | Easton | Central League | Easton, PA | |
| John Herchmer | herkim001--- | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Herenghi | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Thomas Heron | heron-001tho | 1888 | 14 g. | Stockton | California League | Stockton, CA | |
| Thomas Heron | heron-001tho | 1888 | 1 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Joseph Herr | herr--001jos | 1888 | 4/28-6/8 | 29 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Joseph Herr | herr--001jos | 1888 | 43 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Henry Heup | hemp--001hen | 1888 | 6/15-7/4 | 6 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| James Hewer | hewer-001jam | 1888 | 4/26-5/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| James Hewer | hewer-001jam | 1888 | 6/20-8/14 | Kingston | Eastern International League | Kingston, ON | |
| Walter Hewett | hewett001wal | 1888 | g. | Washington | National League | Washington, DC | |
| John Heyn | heyn--001joh | 1888 | 5/13 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Higgins | 1888 | 3 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Bill Higgins | higgin001bil | 1888 | 4/28-8/4 | Syracuse Stars | International Association | Syracuse, NY | |
| Bill Higgins | higgin001bil | 1888 | 8/9- | 14 g. | Boston | National League | Boston, MA |
| Robert Higgins | higgin004rob | 1888 | 4/30-8/6 | Syracuse Stars | International Association | Syracuse, NY | |
| John Hiland | hiland001joh | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Hill | 1888 | 5 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Belden Hill | hill--003bel | 1888 | 4/23-6/11 | Mansfield | Tri-State League | Mansfield, OH | |
| Belden Hill | hill--003bel | 1888 | 25 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Belden Hill | hill--003bel | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| George Hill | 1888 | Buffalo Travellers | Independent | Buffalo, NY | |||
| George Hill | 1888 | 6/12-6/16 | Oswego | Eastern International League | Oswego, NY | ||
| Lewis Hill | hill--002lew | 1888 | 5/8-6/29 | Toledo Maumees | Tri-State League | Toledo, OH | |
| James Hillery | hiller002jam | 1888 | 4/23-9/21 | Lima Lushers | Tri-State League | Lima, OH | |
| Charlie Hilsey | hilsey001cha | 1888 | 5/19-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Charlie Hilsey | hilsey001cha | 1888 | 7/20-7/25 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Hines | hines-029--- | 1888 | 5/8 | Decatur | Central Interstate League | Decatur, IL | |
| Hines | hines-002--- | 1888 | 7/7 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Hunkey Hines | hines-001hun | 1888 | 4/28-6/20 | 28 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Mike Hines | hines-001mik | 1888 | 4/28-8/3 | Salem Witches | New England League | Salem, MA | |
| Mike Hines | hines-001mik | 1888 | -8/18 | 4 g. | Boston | National League | Boston, MA |
| Mike Hines | hines-001mik | 1888 | 9/5-9/29 | Easton | Central League | Easton, PA | |
| Mike Hines | hines-001mik | 1888 | Royalston | Independent | Royalston, MA | ||
| Paul Hines | hines-001pau | 1888 | 133 g. | Indianapolis | National League | Indianapolis, IN | |
| George Hodson | hodson002geo | 1888 | 9 g. | Philadelphia Solar Tips | Independent | Philadelphia, PA | |
| George Hodson | hodson002geo | 1888 | 6/6-6/11 | Buffalo Bisons | International Association | Buffalo, NY | |
| Gus Hoeneman | hoenem001a-- | 1888 | 4/23-6/30 | Canton Nadjys | Tri-State League | Canton, OH | |
| Gus Hoeneman | hoenem001a-- | 1888 | 7/4-8/25 | Columbus Senators | Tri-State League | Columbus, OH | |
| Hoff | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Hoff | 1888 | 7 g. | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Charles Hoffman | hoffma004cha | 1888 | 5/2-6/ | Decatur | Central Interstate League | Decatur, IL | |
| Charles Hoffman | hoffma004cha | 1888 | 41 g. | Rockford | Central Interstate League | Rockford, IL | |
| Charles Hoffman | hoffma004cha | 1888 | 7/2- | Davenport | Central Interstate League | Davenport, IA | |
| Frank Hoffman | hoffma001fra | 1888 | 4/9-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Frank Hoffman | hoffma001fra | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Frank Hoffman | hoffma001fra | 1888 | 7/14-8/2 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Frank Hoffman | hoffma001fra | 1888 | 8/13-10/10 | 12 g. | Kansas City | American Association | Kansas City, MO |
| James Hoffman | 1888 | no g. | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | ||
| Hoffner | hoffne004--- | 1888 | 6/9-6/13 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| John Hoffner | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Chick Hofford | hoffor001jos | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| John Hofford | hoffor001joh | 1888 | 4/14-4/22 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| John Hofford | hoffor001joh | 1888 | 5/24 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| John Hofford | hoffor001joh | 1888 | 6/18 | Memphis Grays | Southern League | Memphis, TN | |
| John Hofford | hoffor001joh | 1888 | 7/17-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | |
| John Hofford | hoffor001joh | 1888 | 8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Mortimer Hogan | hogan-001mor | 1888 | -10/17 | 78 g. | Cleveland | American Association | Cleveland, OH |
| William Hoggins | hoggin001wil | 1888 | Hutchinson | Western League | Hutchinson, KS | ||
| George Hogreiver | hogrie001geo | 1888 | Canton Nadjys | Tri-State League | Canton, OH | ||
| Charles Holacher | holach001cha | 1888 | 19 g. | Davenport | Central Interstate League | Davenport, IA | |
| Bill Holbert | holber001bil | 1888 | 15 g. | Brooklyn | American Association | Brooklyn, NY | |
| Jack Holland | hollan001joh | 1888 | Umpire | Central | , | ||
| Will Holland | hollan007wil | 1888 | 5/19-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Will Holland | hollan007wil | 1888 | 8/16-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Bug Holliday | hollid001bug | 1888 | 1 g. | MLB Umpire | American Association | , | |
| Bug Holliday | hollid001bug | 1888 | 4/28-10/9 | 115 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Edward Holliday | hollid001edw | 1888 | El Paso | Independent | El Paso, TX | ||
| Hollister | 1888 | 7/14-7/26 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| Holmes | holmes001--- | 1888 | Albany Ridgefields | Independent | Albany, NY | ||
| Holmes | holmes001--- | 1888 | 9/1 | Albany Governors | International Association | Albany, NY | |
| Benjamin Holmes | 1888 | Cuban Giants | Independent | Cuban, | |||
| Homer | homer-003--- | 1888 | 1 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Charlie Hoover | hoover001cha | 1888 | 5/20-10/5 | 60 g. | Chicago Maroons | Western Association | Chicago, IL |
| Charlie Hoover | hoover001cha | 1888 | 8/30 | 1 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Charlie Hoover | hoover001cha | 1888 | 10/9- | 3 g. | Kansas City | American Association | Kansas City, MO |
| William Hoover | hoover001bus | 1888 | 5/3-9/19+ | Albany Governors | International Association | Albany, NY | |
| William Hoover | hoover001bus | 1888 | Burlington | Independent | Burlington, NJ | ||
| William Hoover | 1888 | 4/28-6/8 | Umpire | Int | , | ||
| James Horan | 1888 | Umpire | Tx | , | |||
| Jack Horner | horner002jac | 1888 | 5/1-8/7 | 17 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Jack Horner | horner002jac | 1888 | 8/19-8/23 | 2 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Joe Hornung | hornun001mik | 1888 | 107 g. | Boston | National League | Boston, MA | |
| Charles Hoskins | hoskin002cha | 1888 | 14 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Charles Hoskins | hoskin002cha | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Charles Hoskins | hoskin002cha | 1888 | 8/2 | Elkhart | Indiana State League | Elkhart, IN | |
| Pete Hotaling | hotali001pet | 1888 | 98 g. | Cleveland | American Association | Cleveland, OH | |
| Sadie Houck | houck-001sad | 1888 | 4/7-6/5 | Charleston Seagulls | Southern League | Charleston, SC | |
| Sadie Houck | houck-001sad | 1888 | 6/12-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Sadie Houck | houck-001sad | 1888 | 7/11-7/30 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Charlie Householder | househ002cha | 1888 | 4/28-6/9 | Portland | New England League | Portland, ME | |
| Charlie Householder | househ002cha | 1888 | 7/13 | Lowell Chippies | New England League | Lowell, MA | |
| Charlie Householder | househ002cha | 1888 | 8/4-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Charlie Householder | househ002cha | 1888 | 8/18-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Charlie Householder | househ002cha | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| George Hoverter | hovert001geo | 1888 | 5/19-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Sam Hoverter | hovert001sam | 1888 | 5/2- | 6 g. | Decatur | Central Interstate League | Decatur, IL |
| Sam Hoverter | hovert001sam | 1888 | +6/19-6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Sam Hoverter | hovert001sam | 1888 | Philadelphia Solar Tips | Independent | Philadelphia, PA | ||
| F. Hovey | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Julius Hovey | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Fred Howard | 1888 | NMSt | , | ||||
| Howe | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Howe | howe--001--- | 1888 | 8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| Henry Howe | howe--001hen | 1888 | Fayette | Amat | Fayette, IA | ||
| Shorty Howe | howe--001sho | 1888 | 4/28-7/21 | London Tecumsehs | International Association | London, ON | |
| Shorty Howe | howe--001sho | 1888 | 8/31-9/10 | Newark Trunkmakers | Central League | Newark, NJ | |
| Billy Hoy | hoy---001wil | 1888 | 4/20- | 136 g. | Washington | National League | Washington, DC |
| Hoyt | hoyt--004--- | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| Hudson | hudson002--- | 1888 | 6/12-6/16 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Hudson | hudson002--- | 1888 | 7/28-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Nat Hudson | hudson001nat | 1888 | 56 g. | St. Louis Browns | American Association | St. Louis, MO | |
| E.G. Hughes | hughes000eg- | 1888 | Frankfort | Indiana State League | Frankfort, IN | ||
| Joe Hughes | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Mickey Hughes | hughes007mic | 1888 | 4/22- | 40 g. | Brooklyn | American Association | Brooklyn, NY |
| Phil Hughes | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| W. Hughes | hughes002w-- | 1888 | Leadville Blues | Independent | Leadville, CO | ||
| Harry Hulin | hulin-001har | 1888 | 3/30-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Harry Hulin | hulin-001har | 1888 | 7/10-7/22 | Houston Babies | Texas-Southern League | Houston, TX | |
| Harry Hulin | hulin-001har | 1888 | 7/26-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Harry Hulin | hulin-001har | 1888 | 9/8-11/28 | Stockton | California League | Stockton, CA | |
| John Humber | humber001joh | 1888 | 6/16-7/24 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| Humbert | humber003--- | 1888 | 4/26-9/26 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Humphries | 1888 | 5/30 | Oswego | Eastern International League | Oswego, NY | ||
| Daniel Humphries | humphr002dan | 1888 | 4/28-7/18 | Allentown Peanuts | Central League | Allentown, PA | |
| Daniel? Humphries | 1888 | 8/4-8/18 | Norristown | PhilReg | Norristown, PA | ||
| Al Hungler | hungle001al- | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Al Hungler | hungle001al- | 1888 | 8/12-9/1 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| John Hunolt | hunolt001joh | 1888 | 7 g. | Santa Cruz | California State League | Santa Cruz, CA | |
| Hunt | 1888 | 2 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Bill Hunter | hunter001bil | 1888 | Chicago | Amat | Chicago, IL | ||
| George Hupp | huff--001geo | 1888 | +5/12- | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| George Hupp | huff--001geo | 1888 | 8/25-8/28 | 3 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Jerry Hurley | hurley002jer | 1888 | Boston Univ. | College | , | ||
| Jerry Hurley | hurley002jer | 1888 | 3/29- | 59 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Michael Hurley | hurley001mic | 1888 | 5/2- | 16 g. | Decatur | Central Interstate League | Decatur, IL |
| Tim Hurst | hurst-001tim | 1888 | Umpire | CPA | , | ||
| Bill Husted | husted001bil | 1888 | 5/1-9/21 | London Tecumsehs | International Association | London, ON | |
| Jack Huston | huston001jac | 1888 | Lincoln Tree Planters | Western League | Lincoln, NE | ||
| Jack Huston | huston001jac | 1888 | 5/19-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Jack Huston | huston001jac | 1888 | 8/17-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Ed Hutchinson | hutchi002ed- | 1888 | 4/23-9/4 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| F. M.? Hutchinson | 1888 | Burlington | Independent | Burlington, NJ | |||
| Bill Hutchison | hutchi001bil | 1888 | 7/4-10/8 | 38 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Chris Hutt | 1888 | 5/5-6/20 | Camden | PhilReg | Camden, NJ | ||
| Chris Hutt | 1888 | Chester | Independent | Chester, PA | |||
| Hyar | hyar--001--- | 1888 | 8/16 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Hyde | 1888 | 4 g. | Oakland Greenhood & Morans | California State League | Oakland, CA | ||
| Hyndman | hyndma003--- | 1888 | Chester | Independent | Chester, PA | ||
| William Hyndman | hyndma001wil | 1888 | 5/9 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| E. I. Hyneman | 1888 | +3/30-4/11+ | U. of Pennsylvania | College | , | ||
| E. I. Hyneman | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| E. I. Hyneman | 1888 | Cape May | Independent | Cape May, NJ | |||
| Albert Ike | ike---001alb | 1888 | 3/30-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| Albert Ike | ike---001alb | 1888 | 7/11-7/25 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| William Incell | incell001wil | 1888 | 3/29- | 34 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Charlie Ingraham | ingrah001cha | 1888 | 5/5-5/26 | 6 g. | Chicago Maroons | Western Association | Chicago, IL |
| Charlie Ingraham | ingrah001cha | 1888 | 17 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Bert Inks | inks--001ber | 1888 | Galveston Giants | Galveston, TX | |||
| Arthur Irwin | irwin-001art | 1888 | 125 g. | Philadelphia | National League | Philadelphia, PA | |
| Bill Irwin | irwin-001bil | 1888 | 5/10 | Manchester Maroons | New England League | Manchester, NH | |
| Bill Irwin | irwin-001bil | 1888 | 5/31-6/4 | Portland | New England League | Portland, ME | |
| Bill Irwin | irwin-001bil | 1888 | 6/12-8/31 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| John Irwin | irwin-001joh | 1888 | 37 g. | Washington | National League | Washington, DC | |
| John Irwin | irwin-001joh | 1888 | 7/9-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Charles Isaacson | isaacs004cha | 1888 | 5/31-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Charles Isaacson | isaacs004cha | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Charles Isaacson | isaacs004cha | 1888 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | ||
| Frank Ives | ives--001fra | 1888 | 4/24 | Lima Lushers | Tri-State League | Lima, OH | |
| Nick Ivory | ivory-001nic | 1888 | Covington | Independent | Covington, KY | ||
| Nick Ivory | ivory-001nic | 1888 | 4/23-6/1 | Mansfield | Tri-State League | Mansfield, OH | |
| Nick Ivory | ivory-001nic | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| Andy Jackson | jackso005and | 1888 | New York Gorhams | Independent | New York, NY | ||
| Henry Jackson | jackso002hen | 1888 | 4/28-5/19 | Allentown Peanuts | Central League | Allentown, PA | |
| Henry Jackson | jackso002hen | 1888 | 5/24-5/30 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Henry Jackson | jackso002hen | 1888 | no g. | Hamilton Hams | International Association | Hamilton, ON | |
| James Jackson | jackso010jam | 1888 | Kingston | Eastern International League | Kingston, ON | ||
| Oscar Jackson | jackso001osc | 1888 | New York Gorhams | Independent | New York, NY | ||
| Oscar Jackson | jackso001osc | 1888 | Cuban Giants | Independent | Cuban, | ||
| Tom Jackson | 1888 | 32 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Alex Jacobs | jacobs001ale | 1888 | 5/1-9/29 | Scranton Miners | Central League | Scranton, PA | |
| Harry Jacoby | jacoby001har | 1888 | 30 g. | Davenport | Central Interstate League | Davenport, IA | |
| Harry M.? Jacoby | 1888 | 8/11-8/14 | Norristown | PhilReg | Norristown, PA | ||
| Harry M.? Jacoby | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Jahns | 1888 | Danbury | Connecticut State League | Danbury, CT | |||
| Charley James | 1888 | Fort Dodge | Independent | Fort Dodge, IA | |||
| Lawrence James | james-001law | 1888 | 8 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Lawrence James | james-001law | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| William James | james-016wil | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Duke Jantzen | jantze001a-- | 1888 | 12 g. | Chicago Butler | ChicComm | Chicago, IL | |
| Duke Jantzen | jantze001a-- | 1888 | Chicago Garden City | ChicCity | Chicago, IL | ||
| Jenkins | 1888 | 6/4-7/23 | Norristown | PhilReg | Norristown, PA | ||
| Fred Jevne | jevne-001fre | 1888 | 4/30-8/18 | 75 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Fred Jevne | jevne-001fre | 1888 | 19 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Ralph Joanes | joanes001ral | 1888 | Santa Fe | NMSt | Santa Fe, NM | ||
| Johnson | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Johnson | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Bootsey Johnson | johnso000boo | 1888 | +5/17+ | South Bend | Independent | South Bend, IN | |
| Bootsey Johnson | johnso000boo | 1888 | +7/4-7/23+ | South Bend | Indiana State League | South Bend, IN | |
| Dick Johnson | johnso003dic | 1888 | 4/23-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Dick Johnson | johnso003dic | 1888 | 9/19-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| Harry Johnson | 1888 | Cuban Giants | Independent | Cuban, | |||
| Lefty Johnson | johnso037wil | 1888 | 4/28-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Spud Johnson | johnso001spu | 1888 | 5/1-10/9 | 102 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Dick Johnston | johnst001dic | 1888 | 135 g. | Boston | National League | Boston, MA | |
| Johnstone | johnst004--- | 1888 | 5/19-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Jones | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Jones | jones-035--- | 1888 | 2 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Jones | 1888 | +7/24-7/30 | Belleville | Eastern International League | Belleville, NJ | ||
| Jones | 1888 | +8/14 | Brockville | Eastern International League | Brockville, ON | ||
| Abe Jones | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| Charles Jones | jones-022cha | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Charles Jones | jones-022cha | 1888 | 7/2-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| Charles Jones | jones-022cha | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Charley Jones | jones-018cha | 1888 | -4/26 | 6 g. | Kansas City | American Association | Kansas City, MO |
| Charlie Jones | jones-019cha | 1888 | 4/28-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Ephraim Jones | 1888 | 5/5-7/21 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Henry Jones | jones-007hen | 1888 | Grand Rapids | Independent | Grand Rapids, MI | ||
| Henry Jones | jones-007hen | 1888 | Rochester Jingoes | International Association | Rochester, NY | ||
| Joseph Jones | jones-010jos | 1888 | 5/5-6/20 | Camden | PhilReg | Camden, NJ | |
| Joseph Jones | jones-010jos | 1888 | 7/16-7/24 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Mike Jones | jones-002mik | 1888 | 4/28-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| S. Jones | 1888 | 5/30-6/2 | Camden | PhilReg | Camden, NJ | ||
| Silas Jones | jones-001sil | 1888 | 4/28-5/29 | Albany Governors | International Association | Albany, NY | |
| Jordan | jordan022--- | 1888 | Dover | New England Interstate League | Dover, DE | ||
| Mittie Jordan | 1888 | Gardner | Independent | Gardner, ME | |||
| William F. Jordan | jordan001--- | 1888 | no g. | Minneapolis Millers | Western Association | Minneapolis, MN | |
| William F. Jordan | jordan030--- | 1888 | 5/19-8/16 | London Tecumsehs | International Association | London, ON | |
| Bill Joyce | joyce-001bil | 1888 | 4/7-6/24 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Bill Joyce | joyce-001bil | 1888 | 8/17-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Joseph Julian | 1888 | -6/16 | 2 g. | MLB Umpire | American Association | , | |
| H. W. Jungkurth | 1888 | 5/26-8/1 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Dick Juvenal | juvena001dic | 1888 | 6/11- | Newton | Western League | Newton, KS | |
| Kane | kane--003--- | 1888 | 6/14-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Kane | kane--002--- | 1888 | 7/21-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Michael Kane | kane--003mic | 1888 | 5/8- | Hutchinson | Western League | Hutchinson, KS | |
| Thomas Kane | 1888 | Buffalo Travellers | Independent | Buffalo, NY | |||
| Thomas Kane | 1888 | 6/12-6/13 | Oswego | Eastern International League | Oswego, NY | ||
| Thomas Kane | 1888 | 5/26-6/9 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| Thomas Kane | 1888 | 7/17-7/18 | Philadelphia Kensington | PhilReg | Philadelphia, PA | ||
| Henry Kappel | kappel001hei | 1888 | 36 g. | Cincinnati | American Association | Cincinnati, OH | |
| Joe Kappel | kappel001joe | 1888 | 4/28-9/18 | Buffalo Bisons | International Association | Buffalo, NY | |
| P. Kearney | kearne001p-- | 1888 | +5/29+ | Lafayette | Indiana State League | Lafayette, IN | |
| P. Kearney | kearne001p-- | 1888 | 11 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| P. Kearney | kearne001p-- | 1888 | 7/14-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Tom Kearns | kearns001tom | 1888 | 4/28-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| Ed Keas | keas--001ed- | 1888 | 19 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Ed Keas | keas--001ed- | 1888 | 8/25-10/16 | 6 g. | Cleveland | American Association | Cleveland, OH |
| D. Keating | 1888 | Derby | Connecticut State League | Derby, CT | |||
| George Keefe | keefe-002geo | 1888 | 4/28-8/28 | Troy Trojans | International Association | Troy, NY | |
| George Keefe | keefe-002geo | 1888 | - 4/28 | 13 g. | Washington | National League | Washington, DC |
| John Keefe | keefe-001joh | 1888 | Holy Cross Col. | College | , | ||
| John Keefe | keefe-001joh | 1888 | 6/1-7/4 | Oswego | Eastern International League | Oswego, NY | |
| John Keefe | keefe-001joh | 1888 | 7/9-7/30 | Belleville | Eastern International League | Belleville, NJ | |
| John Keefe | keefe-001joh | 1888 | +8/6-8/14 | Brockville | Eastern International League | Brockville, ON | |
| John Keefe | keefe-001joh | 1888 | Worcester | Amat | Worcester, MA | ||
| Tim Keefe | keefe-002tim | 1888 | 51 g. | New York | National League | New York, NY | |
| Keenan | keenan002--- | 1888 | 5/30 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Jack Keenan | keenan001kid | 1888 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | ||
| Jack Keenan | keenan001jac | 1888 | New York Reserves | Independent | New York, NY | ||
| Jim Keenan | keenan001jim | 1888 | 85 g. | Cincinnati | American Association | Cincinnati, OH | |
| Keeney | keeney002--- | 1888 | 7/18 | Manchester Maroons | New England League | Manchester, NH | |
| Frank Keffer | keffer001fra | 1888 | no g. | Ashland | Central Pennsylvania League | Ashland, PA | |
| Adam Keifer | keifer001ada | 1888 | 4/28-5/30 | Allentown Peanuts | Central League | Allentown, PA | |
| James Keith | keith-003jam | 1888 | 5/8-6/6 | Lincoln Tree Planters | Western League | Lincoln, NE | |
| Edward Kelley | kelley001edw | 1888 | 6/6-6/9 | Portland | New England League | Portland, ME | |
| George Kelley | kelley003geo | 1888 | 5 g. | Oakland Tribunes | California State League | Oakland, CA | |
| George Kelley | kelley003geo | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| W. Kelley | kelley007w-- | 1888 | +5/29+ | Lafayette | Indiana State League | Lafayette, IN | |
| Nate Kellogg | kellog001nat | 1888 | 4/28-6/9 | Buffalo Bisons | International Association | Buffalo, NY | |
| Nate Kellogg | kellog001nat | 1888 | 6/25-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| Nate Kellogg | kellog001nat | 1888 | 9/24-9/29 | Hamilton Hams | International Association | Hamilton, ON | |
| Kelly | kelly-032--- | 1888 | 5/4-7/25 | Scranton Miners | Central League | Scranton, PA | |
| Kelly | kelly-069--- | 1888 | 8/8-8/16 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Kelly | 1888 | 7/16-7/17 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Kelly | 1888 | 7/17 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| Kelly | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Kelly | 1888 | Chester | Independent | Chester, PA | |||
| Kelly | kelly-028--- | 1888 | 2 g. | Decatur | Central Interstate League | Decatur, IL | |
| Fred Kelly | kelly-003fre | 1888 | 5/5-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | |
| John Kelly | 1888 | 10 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Kick Kelly | kelly-001kic | 1888 | -6/7 | 39 g. | Louisville | American Association | Louisville, KY |
| Kick Kelly | kelly-001kic | 1888 | 92 g. | MLB Umpire | National League | , | |
| King Kelly | kelly-002kin | 1888 | 107 g. | Boston | National League | Boston, MA | |
| Patrick Kelly | kelly-004pat | 1888 | 4/28 | Toledo Maumees | Tri-State League | Toledo, OH | |
| W. Kelly | 1888 | 6 g. | Oakland Clevelands | California State League | Oakland, CA | ||
| W. A. Kelly | 1888 | 5/30-6/13 | Kingston | Eastern International League | Kingston, ON | ||
| John Kelty | kelty-001joh | 1888 | 4/28-6/25 | Manchester Maroons | New England League | Manchester, NH | |
| John Kelty | kelty-001joh | 1888 | 6/29-9/7 | Worcester Grays | New England League | Worcester, MA | |
| Rudy Kemmler | kemmle001rud | 1888 | 5/4-8/15 | 31 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Rudy Kemmler | kemmle001rud | 1888 | 8/18 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Rudy Kemmler | kemmle001rud | 1888 | 9/9-9/30 | 9 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Kendrick | kendri002--- | 1888 | 5/19-7/17 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| William Kendrick | kendri001wil | 1888 | 5/12 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | |
| Kennedy | 1888 | 5/9-6/9 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Kennedy | 1888 | 7/4-7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Kennedy | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Doc Kennedy | kenned001doc | 1888 | 4/28-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Ed Kennedy | kenned001ed- | 1888 | 4/28-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| Ted Kennedy | kenned001ted | 1888 | 5/10-8/7 | 16 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Ted Kennedy | kenned001ted | 1888 | 8/16-10/4 | 16 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Bert Kenney | kenney001ber | 1888 | 4/28-6/7 | Elmira | Central League | Elmira, NY | |
| Bert Kenney | kenney001ber | 1888 | 7/- | 6 g. | Waterloo | Central New York League | Waterloo, NY |
| Bert Kenney | kenney001ber | 1888 | 21 g. | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Kent | kent--002--- | 1888 | 6/15-6/19 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Ed Kent | kent--001ed- | 1888 | 6/7-6/16 | Binghamton Crickets | Central League | Binghamton, NY | |
| Jack Kenyon | kenyon001jac | 1888 | 4/28-6/20 | 13 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Matt Keogan | keogan001mat | 1888 | 5/1- | 26 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| Matt Keogan | keogan001mat | 1888 | 8/13-10/7 | 21 g. | Chicago Maroons | Western Association | Chicago, IL |
| E. H. Kephart | 1888 | 5/5-6/26 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| John Kerins | kerins001joh | 1888 | 83 g. | Louisville | American Association | Louisville, KY | |
| Henry Kessler | kessle001hen | 1888 | Columbus Senators | Tri-State League | Columbus, OH | ||
| Kichen | 1888 | 7 g. | Oakland Clevelands | California State League | Oakland, CA | ||
| Bill Kienzle | kienzl001bil | 1888 | 4/7-4/26 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Bill Kienzle | kienzl001bil | 1888 | 5/7-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| Bill Kienzle | kienzl001bil | 1888 | 7/11-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| H. Kienzler | 1888 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |||
| John Kiley | kiley-001joh | 1888 | 5/31 | Salem Witches | New England League | Salem, MA | |
| Kilroy | 1888 | 8/6-8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| M. Kilroy | 1888 | 7/21-8/4 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Matt Kilroy | kilroy001mat | 1888 | 43 g. | Baltimore | American Association | Baltimore, MD | |
| Mike Kilroy | kilroy001mik | 1888 | 7/18-7/25 | Philadelphia Kensington | PhilReg | Philadelphia, PA | |
| Mike Kilroy | kilroy001mik | 1888 | 9/1 | 1 g. | Baltimore | American Association | Baltimore, MD |
| P. Kilroy | 1888 | 6/20-8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| W. Kilroy | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Sam Kimber | kimber001sam | 1888 | 4/28-5/8 | Portland | New England League | Portland, ME | |
| Sam Kimber | kimber001sam | 1888 | 6/19-8/9 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| John Kimble | kimbal002joh | 1888 | Millville | Independent | Millville, NJ | ||
| King | 1888 | Las Vegas | NMSt | Las Vegas, NV | |||
| Silver King | king--001sil | 1888 | 66 g. | St. Louis Browns | American Association | St. Louis, MO | |
| W. H. King | 1888 | no g. | Philadelphia | American Association | Philadelphia, PA | ||
| W. H. King | 1888 | Princeton Univ. | College | , | |||
| W. H. King | 1888 | -8/14+ | Cape May | Independent | Cape May, NJ | ||
| W. H. King | 1888 | Philadelphia Houston | Independent | Philadelphia, PA | |||
| William King | king--013wil | 1888 | Mobile Gilneys | Independent | Mobile, AL | ||
| Lee Kingsley | 1888 | +6/4-8/6 | Watertown | Eastern International League | Watertown, NY | ||
| Moses Kingsley | kingsl001mos | 1888 | 4/28-8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| Moses Kingsley | kingsl001mos | 1888 | 8/9-9/13 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Tom Kinslow | kinslo001tom | 1888 | 4/28-9/15+ | London Tecumsehs | International Association | London, ON | |
| Walt Kinzie | kinzie001wal | 1888 | 10 g. | Chicago Putnams | ChicComm | Chicago, IL | |
| John Kirby | kirby-002joh | 1888 | 4/10-5/2 | Memphis Grays | Southern League | Memphis, TN | |
| John Kirby | kirby-002joh | 1888 | -6/29 | 5 g. | Kansas City | American Association | Kansas City, MO |
| Wayne Kirby | kirby-003way | 1888 | 4/23-8/29 | Lima Lushers | Tri-State League | Lima, OH | |
| Almon Kirtland | kirtla001alm | 1888 | 5/30-7/4 | Oswego | Eastern International League | Oswego, NY | |
| Almon Kirtland | kirtla001alm | 1888 | +7/20-7/24 | Watertown | Eastern International League | Watertown, NY | |
| George Kittle | kittle001geo | 1888 | 4/7-7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| George Kittle | kittle001geo | 1888 | 7/10-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Malachi Kittridge | kittri001mal | 1888 | +6/12+ | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| Malachi Kittridge | kittri001mal | 1888 | 7/24-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Gus Klopf | klopf-001gus | 1888 | 5/1-8/18 | 26 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Gus Klopf | klopf-001gus | 1888 | 8/25-9/29 | 19 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Billy Klusman | klusma001bil | 1888 | 4/28-6/20 | Manchester Maroons | New England League | Manchester, NH | |
| Billy Klusman | klusma001bil | 1888 | 6/21- | 28 g. | Boston | National League | Boston, MA |
| Frank Knauss | knauss001fra | 1888 | 31 g. | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Phil Knell | knell-001phi | 1888 | 3/29-5/27+ | Oakland Greenhood & Morans | California League | Oakland, CA | |
| Phil Knell | knell-001phi | 1888 | 7/6- | 3 g. | Pittsburgh | National League | Pittsburgh, PA |
| Knight | 1888 | 5/12-8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Joe Knight | knight002jos | 1888 | 4/28-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| Lon Knight | knight001lon | 1888 | 4/28-7/21 | Umpire | NE | , | |
| Lon Knight | knight001lon | 1888 | 7 g. | MLB Umpire | National League | , | |
| A. T. Knocchell | 1888 | Danbury | Connecticut State League | Danbury, CT | |||
| Knorr | knorr-003--- | 1888 | 6/25-7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | |
| Knorr | knorr-003--- | 1888 | 8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| Ed Knouff | knouff001ed- | 1888 | 9 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Ed Knouff | knouff001ed- | 1888 | 2 g. | Cleveland | American Association | Cleveland, OH | |
| Jimmy Knowles | knowle001jim | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| George Knowlton | knowlt001geo | 1888 | 4/7-6/5 | Charleston Seagulls | Southern League | Charleston, SC | |
| George Knowlton | knowlt001geo | 1888 | 6/25-7/7 | Manchester Maroons | New England League | Manchester, NH | |
| Herbert Knowlton | knowlt001her | 1888 | Harvard Univ. | College | , | ||
| Herbert Knowlton | knowlt001her | 1888 | 7/3-8/3 | Salem Witches | New England League | Salem, MA | |
| Herbert Knowlton | knowlt001her | 1888 | 8/18-9/24 | Easton | Central League | Easton, PA | |
| Herbert Knowlton | knowlt001her | 1888 | Royalston | Independent | Royalston, MA | ||
| Andy Knox | knox--001and | 1888 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Dick Knox | knox--002ric | 1888 | 4/28-7/3 | Rochester Jingoes | International Association | Rochester, NY | |
| Dick Knox | knox--002ric | 1888 | 7/18-9/8 | Albany Governors | International Association | Albany, NY | |
| Dick Knox | knox--002ric | 1888 | 1 g. | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Koons | 1888 | 7/21-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| Fred Koons | 1888 | Norwich | Independent | Norwich, CT | |||
| Fred Koons | 1888 | 7/14-7/18 | Norristown | PhilReg | Norristown, PA | ||
| Fred Koons | koons-001fre | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Harry Koons | koons-001har | 1888 | 4/28-6/9 | Portland | New England League | Portland, ME | |
| V. Kotter | 1888 | Austin Senators/San Antonio | Texas League | Austin, TX | |||
| V. Kotter | 1888 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |||
| Charlie Krehmeyer | krehme001cha | 1888 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | ||
| Charlie Krehmeyer | krehme001cha | 1888 | 8/27-8/31 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Bill Krieg | krieg-001bil | 1888 | 5/1-8/18 | 57 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Bill Krieg | krieg-001bil | 1888 | 8/24-10/9 | 38 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Gus Krock | krock-001gus | 1888 | 4/24- | 39 g. | Chicago | National League | Chicago, IL |
| Al Krumm | krumm-001al- | 1888 | 5/12 | Lima Lushers | Tri-State League | Lima, OH | |
| Bill Kuehne | kuehne001bil | 1888 | 138 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Fred Kuhns | kuhns-001fre | 1888 | 5/5 | Albany Governors | International Association | Albany, NY | |
| Kulp | 1888 | 5/5-8/13 | Chester Houston | PhilReg | Chester, PA | ||
| Kurtz | kurtz-001--- | 1888 | 1 g. | Peoria Reds | Central Interstate League | Peoria, IL | |
| Henry Kurtz | kurtz-002hen | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Henry Kurtz | kurtz-002hen | 1888 | 8/10 | Hazleton Pugilists | Central League | Hazleton, PA | |
| William Ladew | ladew-001wil | 1888 | 5/5 | Portland | New England League | Portland, ME | |
| Dan Lally | lally-001dan | 1888 | 5/3-5/14 | Toronto Canucks | International Association | Toronto, ON | |
| Dan Lally | lally-001dan | 1888 | +6/1-7/30 | Belleville | Eastern International League | Belleville, NJ | |
| Dan Lally | lally-001dan | 1888 | +8/6-8/14 | Brockville | Eastern International League | Brockville, ON | |
| Dan? Lally | 1888 | 1 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Legrove Lamberson | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | |||
| Leroy Lamberson | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | |||
| Lamowry | lamowr001--- | 1888 | 5/14- | Haverhill | New England Interstate League | Haverhill, MA | |
| Henry Lamp | 1888 | , | |||||
| Gus Land | land--001gus | 1888 | Lincoln Tree Planters | Western League | Lincoln, NE | ||
| Gus Land | land--001gus | 1888 | 4 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Gus Land | land--001gus | 1888 | El Paso | Independent | El Paso, TX | ||
| Doc Landis | landis001doc | 1888 | 4/9 | Galveston Giants | Texas League | Galveston, TX | |
| Doc Landis | landis001doc | 1888 | 4/22-5/21 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Doc Landis | landis001doc | 1888 | 6/15-6/30 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Doc Landis | landis001doc | 1888 | 7/12-7/24 | Houston Babies | Texas-Southern League | Houston, TX | |
| Michael Landmann | landma001m-- | 1888 | 8/30-9/29 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Lane | lane--002--- | 1888 | 6/16 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Franklin Lang | lang--002fra | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Fred Lange | lange-001fre | 1888 | 5/1-7/10 | 50 g. | Chicago Maroons | Western Association | Chicago, IL |
| Fred Lange | lange-001fre | 1888 | 7/12-8/27 | 31 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Fred Lange | lange-001fre | 1888 | 16 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| Bob Langsford | langsf001bob | 1888 | Paducah | Paducah, KY | |||
| Henry Lanser | lanser001hen | 1888 | +5/28+ | Cincinnati Shamrocks | Independent | Cincinnati, OH | |
| Addison Lansing | 1888 | U. of Pennsylvania | College | , | |||
| Addison Lansing | 1888 | Cape May | Independent | Cape May, NJ | |||
| C. Larkin | 1888 | Norwalk | Connecticut State League | Norwalk, CT | |||
| Henry Larkin | larkin001hen | 1888 | 135 g. | Philadelphia | American Association | Philadelphia, PA | |
| Patrick Larkins | larkin003--- | 1888 | +5/12-6/21 | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| Patrick Larkins | larkin003--- | 1888 | 8 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| Sam LaRocque | larocq001sam | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Sam LaRocque | larocq001sam | 1888 | 7/30- | 2 g. | Detroit | National League | Detroit, MI |
| Sam LaRocque | larocq001sam | 1888 | 8/8-9/15+ | London Tecumsehs | International Association | London, ON | |
| Arlie Latham | latham002wal | 1888 | 133 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Jumbo Latham | latham001jum | 1888 | 4/28-5/30 | Elmira | Central League | Elmira, NY | |
| Jumbo Latham | latham001jum | 1888 | Umpire | Cent | , | ||
| Paul Latouche | latouc001pau | 1888 | 5/8-5/30 | Elmira | Central League | Elmira, NY | |
| Paul Latouche | latouc001pau | 1888 | +7/21-7/24 | Watertown | Eastern International League | Watertown, NY | |
| Paul Latouche | latouc001pau | 1888 | 14 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| Paul Latouche | latouc001pau | 1888 | 9/22 | Albany Governors | International Association | Albany, NY | |
| Chuck Lauer | lauer-001chu | 1888 | 4/22-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Floyd Lauman | lauman001flo | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Lautenbach | lauten003--- | 1888 | Danbury | Connecticut State League | Danbury, CT | ||
| Johnny Lavin | lavin-001joh | 1888 | 4/28-7/31 | Binghamton Crickets | Central League | Binghamton, NY | |
| Lawler | 1888 | 3 g. | Waterloo | Central New York League | Waterloo, NY | ||
| M.H. Lawler | lawler001m-- | 1888 | 4/24 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Lawless | 1888 | +6/12-7/30 | Belleville | Eastern International League | Belleville, NJ | ||
| Lawless | 1888 | +8/6-8/11 | Brockville | Eastern International League | Brockville, ON | ||
| Lawson | lawson024--- | 1888 | +7/26-7/27+ | Marion | Indiana State League | Marion, IN | |
| Al Lawson | lawson001al- | 1888 | Goshen | Independent | Goshen, IN | ||
| C. F. Lawton | 1888 | Danbury | Connecticut State League | Danbury, CT | |||
| Horatio Lawton | lawton001hor | 1888 | 3/29- | 64 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Bob Leadley | leadle001rob | 1888 | 8/27- | 40 g. | Detroit | National League | Detroit, MI |
| Gus Lear | lear--001gus | 1888 | 32 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| William Lee | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| Llewellyn Legg | legg--001lle | 1888 | 5/9-6/ | Decatur | Central Interstate League | Decatur, IL | |
| Llewellyn Legg | legg--001lle | 1888 | 30 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Llewellyn Legg | legg--001lle | 1888 | 7/18-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Mike Lehane | lehane001mik | 1888 | 4/28-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Lehr | 1888 | Elmira | Independent | Elmira, NY | |||
| Lehr | 1888 | Altoona | Independent | Altoona, PA | |||
| John Leighton | leight002joh | 1888 | 5/14-6/12+ | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| John Leighton | leight002joh | 1888 | 7/20-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Doc Leitner | leitne001doc | 1888 | Staten Island | Independent | Staten Island, NY | ||
| C. S. Leland | 1888 | Danbury | Connecticut State League | Danbury, CT | |||
| Frank Leland | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| Frank Lemons | lemons001fra | 1888 | 4/28-6/7 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Frank Lemons | lemons001fra | 1888 | 7/16-9/1 | Mansfield | Tri-State League | Mansfield, OH | |
| Harry Lemons | lemons002fra | 1888 | 4/17-5/8 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Harry Lemons | lemons002fra | 1888 | 6/20 | Charleston Seagulls | Southern League | Charleston, SC | |
| William Lenardson | lenard001wil | 1888 | 6/18-7/30 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Frank Leonard | leonar001fra | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| Frank Leonard | leonar001fra | 1888 | 7/20-9/10 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Henry Leonard | leonar001hen | 1888 | 4/28-9/29 | Rochester Jingoes | International Association | Rochester, NY | |
| Jim Leonard | leonar001jim | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| Jacob Lersch | lersch001jac | 1888 | 4/23-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| Joe Leveque | levequ001joe | 1888 | 5 g. | San Francisco Emersons | California State League | San Francisco, CA | |
| S. W. Lever | 1888 | 6/30-7/24 | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| S. W. Lever | 1888 | 8/29-9/10 | Waterloo | Central New York League | Waterloo, NY | ||
| Charlie Levis | levis-001cha | 1888 | 4/7-6/29 | Dallas Hams | Texas League | Dallas, TX | |
| Charlie Levis | levis-001cha | 1888 | 7/11-8/13 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| David Levy | levy--001dav | 1888 | 3 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| David Levy | levy--001dav | 1888 | 1 g. | San Francisco Emersons | California State League | San Francisco, CA | |
| Rube Levy | levy--001reu | 1888 | 3/29- | 67 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Lewis | lewis-038--- | 1888 | 8/28-9/4 | Albany Governors | International Association | Albany, NY | |
| F.J. Lewis | lewis-002f-- | 1888 | 5/19-6/21 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| F.J. Lewis | lewis-002f-- | 1888 | 6/27-7/2 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| F.J. Lewis | lewis-002f-- | 1888 | 7/6-7/31 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Fred Lewis | lewis-003fre | 1888 | 6/4-7/14 | Toronto Canucks | International Association | Toronto, ON | |
| Leyden | leyden001--- | 1888 | 8/25 | 1 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Jim Lillie | lillie001jim | 1888 | 4/21-6/9 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Lilly | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Lindley | lindle002--- | 1888 | 6/4-6/ | 5 g. | Decatur | Central Interstate League | Decatur, IL |
| F. Linnehan | linneh001f-- | 1888 | Lafayette | Indiana State League | Lafayette, IN | ||
| F. Linnehan | linneh001f-- | 1888 | 11 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Hugh Linnehan | linneh001hug | 1888 | Meriden | Connecticut State League | Meridan, CT | ||
| James Little | little007jam | 1888 | Toronto | Amat | Toronto, ON | ||
| James Little | little007jam | 1888 | 5/30-8/14 | Kingston | Eastern International League | Kingston, ON | |
| Abe Litz | litz--002abr | 1888 | 5/8- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Abe Litz | litz--002abr | 1888 | 7/4-7/8 | 6 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Evan Llewellyn | llewel001eva | 1888 | 9/12-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| Loasby | 1888 | Rochester Sachs-Prudens | Independent | Rochester, NY | |||
| Loasby | 1888 | 3 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Lockman | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Horace Lockwood | lockwo001hor | 1888 | -8/31 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Tom Loftus | loftus002tom | 1888 | 4/28-6/20 | St. Louis Whites | Western Association | St. Louis, MO | |
| Tom Loftus | loftus002tom | 1888 | 479 g. | Cleveland | American Association | Cleveland, OH | |
| Joe Lohbeck | lohbec001jos | 1888 | 3/30-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Joe Lohbeck | lohbec001jos | 1888 | 7/10-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| Joe Lohbeck | lohbec001jos | 1888 | 8/9-8/14 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Charles Lohr | 1888 | no g. | Elmira | Central League | Elmira, NY | ||
| James Lombard | lombar002jam | 1888 | 5/16 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| James Lombard | lombar002jam | 1888 | 5/31-7/23 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Billy Long | long--001bil | 1888 | 4/28-8/3 | Salem Witches | New England League | Salem, MA | |
| Billy Long | long--001bil | 1888 | 8/11-9/2 | Syracuse Stars | International Association | Syracuse, NY | |
| Dan Long | long--003dan | 1888 | 3/29- | 66 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| Dan Long | long--003dan | 1888 | 1 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Harry Long | long--005har | 1888 | Philadelphia AA Reserves | Independent | Philadelphia, PA | ||
| Harry Long | long--005har | 1888 | 6/2-6/16 | Camden | PhilReg | Camden, NJ | |
| Harry Long | long--005har | 1888 | +8/17+ | Chester | Independent | Chester, PA | |
| Herman Long | long--001her | 1888 | 5/1-7/10 | 50 g. | Chicago Maroons | Western Association | Chicago, IL |
| Herman Long | long--001her | 1888 | 7/12-10/9 | 71 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Robert Long | long--008rob | 1888 | 5/19-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Thomas Long | long--002--- | 1888 | Philadelphia AA Reserves | Independent | Philadelphia, PA | ||
| Thomas Long | long--002--- | 1888 | 6/6-6/16 | Camden | PhilReg | Camden, NJ | |
| Thomas Long | long--002--- | 1888 | +8/17+ | Chester | Independent | Chester, PA | |
| Thomas Long | long--002--- | 1888 | 8/29 | 1 g. | Louisville | American Association | Louisville, KY |
| W. W. Long | 1888 | Lafayette Col. | College | , | |||
| Jacob Lookabaugh | lookab001jac | 1888 | 16 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Jacob Lookabaugh | lookab001jac | 1888 | Rockford | Central Interstate League | Rockford, IL | ||
| Anson Lord | lord--001ans | 1888 | 5/3-5/26 | Albany Governors | International Association | Albany, NY | |
| Anson Lord | lord--001ans | 1888 | 6/25 | Binghamton Crickets | Central League | Binghamton, NY | |
| Edward Lorrigan | lorrig001edw | 1888 | 3/29- | 27 g. | Stockton | California League | Stockton, CA |
| Losch | losch-001--- | 1888 | 6/16-7/12 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Benjamin Lotz | lotz--001ben | 1888 | 39 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Loughlin | 1888 | +6/1-6/7 | Belleville | Eastern International League | Belleville, NJ | ||
| James Loughlin | loughl001jam | 1888 | 5/28-5/30 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Bill Loughran | loughl002--- | 1888 | 5/31-6/1 | Binghamton Crickets | Central League | Binghamton, NY | |
| Frank Loughran | loughr001fra | 1888 | 10 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| Frank Loughran | loughr001fra | 1888 | 5 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| William Lovell | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Levi Lovely | lovely001lev | 1888 | 4/28 | London Tecumsehs | International Association | London, ON | |
| Levi Lovely | lovely001lev | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| James Lovett | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Tom Lovett | lovett001tom | 1888 | 4/30-10/7 | 65 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| W.A. Lovett | lovett000wa- | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Bobby Lowe | lowe--002rob | 1888 | 4/28-10/7 | 114 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Thomas Lowe | lowe--001tho | 1888 | 7 g. | Rockford | Central Interstate League | Rockford, IL | |
| Patrick Lowery | lowery002pat | 1888 | 4/18-5/20 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| William Lucas | lucas-005wil | 1888 | 5/1-7/23 | Davenport | Central Interstate League | Davenport, IA | |
| William Lucas | lucas-005wil | 1888 | 8/25- | Davenport Onion Weeders | Western Association | Davenport, IA | |
| Al Lukens | lukens001al- | 1888 | Sacred Heart Col | College | , | ||
| Will Lund | lund--001wil | 1888 | 4/23-4/26 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Luke Lutenberg | lutenb001luk | 1888 | , | ||||
| Ham Lutton | lutton001ham | 1888 | Chester | Independent | Chester, PA | ||
| Lux | lux---001--- | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | |
| Henry Lynch | lynch-003hen | 1888 | 4/30-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Henry Lynch | lynch-003hen | 1888 | 8/2-9/7 | Worcester Grays | New England League | Worcester, MA | |
| Jack Lynch | lynch-001jac | 1888 | 4/28-5/4 | Lowell Chippies | New England League | Lowell, MA | |
| Jack Lynch | lynch-001jac | 1888 | 6/22-9/29 | Scranton Miners | Central League | Scranton, PA | |
| Michael Lynch | lynch-010mic | 1888 | 5/13 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Thomas Lynch | lynch-003tom | 1888-94 | 4/20- | 891 g. | MLB Umpire | National League | , |
| Tom Lynch | lynch-002tom | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Tom Lynch | lynch-002tom | 1888 | 7/7-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| Lyons | lyons-051--- | 1888 | +5/23-6/9 | Elkhart | Indiana State League | Elkhart, IN | |
| Denny Lyons | lyons-002den | 1888 | 111 g. | Philadelphia | American Association | Philadelphia, PA | |
| Harry Lyons | lyons-001har | 1888 | 5/24-5/26 | Portland | New England League | Portland, ME | |
| Harry Lyons | lyons-001har | 1888 | 123 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Pat Lyons | lyons-003pat | 1888 | +6/1-7/30 | Belleville | Eastern International League | Belleville, NJ | |
| Pat Lyons | lyons-003pat | 1888 | +8/6-8/14 | Brockville | Eastern International League | Brockville, ON | |
| Toby Lyons | lyons-001tob | 1888 | 6/8 | Lowell Chippies | New England League | Lowell, MA | |
| Toby Lyons | lyons-001tob | 1888 | Lowell Chippies | New England League | Lowell, MA | ||
| Toby Lyons | lyons-001tob | 1888 | Royalston | Independent | Royalston, MA | ||
| John Lyston | lyston001joh | 1888 | Baltimore Reserves | Independent | Baltimore, MD | ||
| Mortimer Lyston | lyston001mor | 1888 | +8/27+ | Baltimore Waverly | Independent | Baltimore, MD | |
| William Lyston | lyston001wil | 1888 | Baltimore Reserves | Independent | Baltimore, MD | ||
| Dad Lytle | lytle-001dad | 1888 | Grand Island | Independent | Grand Island, NE | ||
| David Macaffrey | macaff001dav | 1888 | 5/14-6/12+ | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| David Macaffrey | macaff001dav | 1888 | 7/20-7/21 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Mac MacArthur | macart001mac | 1888 | Elkhart | Indiana State League | Elkhart, IN | ||
| Mack | mack--021--- | 1888 | 4/30-5/1 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Mack | mack--021--- | 1888 | New Jersey | Amat | New Jersey, NJ | ||
| Mack | mack--006--- | 1888 | 5/26-6/ | 4 g. | Decatur | Central Interstate League | Decatur, IL |
| Connie Mack | mack--001con | 1888 | 85 g. | Washington | National League | Washington, DC | |
| Reddy Mack | mack--001red | 1888 | 112 g. | Louisville | American Association | Louisville, KY | |
| MacKaye | 1888 | NMSt | , | ||||
| Mackert | macker001--- | 1888 | 6/25 | Binghamton Crickets | Central League | Binghamton, NY | |
| Frederick Macklin | mackli001fre | 1888 | Kingston | Eastern International League | Kingston, ON | ||
| Jimmy Macullar | macull001jim | 1888 | 4/28-10/9 | 117 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Madden | madden003--- | 1888 | 5/26-6/14 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Kid Madden | madden001kid | 1888 | -10/6 | 20 g. | Boston | National League | Boston, MA |
| Madigan | madiga001--- | 1888 | 4/24-5/31 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Frank Madigan | madiga001fra | 1888 | 5/14-6/12+ | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| Frank Madigan | madiga001fra | 1888 | 7/20-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Magee | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| John Magner | magner001joh | 1888 | 3/29 pre-season | Dallas Hams | Texas League | Dallas, TX | |
| John Magner | magner001joh | 1888 | 4/17 | Umpire | Independent | , | |
| Tom Maguire | maguir001tho | 1888 | San Francisco Will & Fincks | CalAm | San Francisco, CA | ||
| Tom Maguire | maguir001tho | 1888 | San Francisco Reports | CalAM | San Francisco, CA | ||
| Maher | maher-006--- | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Robert Mahon | mahon-002rob | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Robert Mahon | mahon-002rob | 1888 | 8/9-8/15 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Mahoney | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Mahoney | mahone002--- | 1888 | 7/26 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Dan Mahoney | mahone003dan | 1888 | 5/2-8/20 | Manchester Maroons | New England League | Manchester, NH | |
| David Mahoney | mahone002dav | 1888 | 5/14-6/9 | Portland | New England League | Portland, ME | |
| David Mahoney | mahone002dav | 1888 | ?-7/ | Nashua | New England Interstate League | Nashua, NH | |
| Michael Mahoney | mahone002mic | 1888 | 5/14- | Umpire | NEIntSt | , | |
| Michael Mahoney | mahone002mic | 1888 | 7/20..8/18-9/7 | Umpire | NE | , | |
| Willard Mains | mains-001wil | 1888 | 23 g. | Davenport | Central Interstate League | Davenport, IA | |
| Willard Mains | mains-001wil | 1888 | 8/3- | 2 g. | Chicago | National League | Chicago, IL |
| Malloy | malloy002--- | 1888 | 5/30-8/9 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Fergy Malone | malone001fer | 1888 | 4/28-5/? | Allentown Peanuts | Central League | Allentown, PA | |
| J. R. Malone | malone001jr- | 1888 | 6/21=6/23 | MLB Umpire | American Association | , | |
| William Malone | malone008wil | 1888 | Cuban Giants | Independent | Cuban, | ||
| Mike Maloney | 1888 | Umpire | NE | , | |||
| Linc Manlove | manlov001abr | 1888 | 38 g. | Davenport | Central Interstate League | Davenport, IA | |
| Fred Mann | mann--001fre | 1888 | 4/28-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Fred Mann | mann--001fre | 1888 | 7/16-9/16 | Columbus Senators | Tri-State League | Columbus, OH | |
| Al Mannassau | mannas001al- | 1888 | +6/14+ | Elkhart | Indiana State League | Elkhart, IN | |
| Jack Manning | mannin001jac | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| Jack Manning | mannin001jac | 1888 | 7/18-9/7 | Umpire | NE | , | |
| Jim Manning | mannin001jim | 1888 | 5/1-10/8 | 117 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Tim Manning | mannin001tim | 1888 | 6/27-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| Mike Mansell | mansel001mik | 1888 | 4/28-7/12 | Hamilton Hams | International Association | Hamilton, ON | |
| Mike Mansell | mansel001mik | 1888 | 7/18-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| Frank March | march-001fra | 1888 | Minneapolis Lyndales | Independent | Minneapolis, MN | ||
| Frank March | march-001fra | 1888 | 6/22-7/10 | 4 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Frank March | march-001fra | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| B. Mariott | mariot000b-- | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Lefty Marr | marr--001lef | 1888 | 4/28-9/19+ | Syracuse Stars | International Association | Syracuse, NY | |
| Ed Mars | mars--001ed- | 1888 | Chicago | Amat | Chicago, IL | ||
| Charley Marston | marsto001cha | 1888 | 4/28-5/1 | Umpire | NE | , | |
| Martin | 1888 | 6/30-9/15 | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Marx | 1888 | 6/20-8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Leech Maskrey | maskre001lee | 1888 | 4/28-10/7 | 126 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Joseph Masran | masran001jos | 1888 | 5/11-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| Joseph Masran | masran001jos | 1888 | 7/11-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Massey | 1888 | 5/12 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Bobby Mathews | mathew001bob | 1888 | 4 g. | MLB Umpire | American Association | , | |
| Matthews | matthe001--- | 1888 | 5/1-5/9 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Matthews | 1888 | Philadelphia AA Reserves | Independent | Philadelphia, PA | |||
| Samuel Matthews | matthe001sam | 1888 | 7/16 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| Steve Matthias | matthi001ste | 1888 | 5/3 | Albany Governors | International Association | Albany, NY | |
| Mike Mattimore | mattim001mik | 1888 | Philadelphia AA Reserves | Independent | Philadelphia, PA | ||
| Mike Mattimore | mattim001mik | 1888 | 41 g. | Philadelphia | American Association | Philadelphia, PA | |
| Hal Mauck | mauck-001hal | 1888 | 2 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Al Maul | maul--001alb | 1888 | 74 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Mauren | mauren000--- | 1888 | +7/4-7/23+ | South Bend | Indiana State League | South Bend, IN | |
| George Maurer | maurer003geo | 1888 | 4/7-5/7 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| J. H. Mawson | 1888 | 5/12-6/20 | Camden | PhilReg | Camden, NJ | ||
| Patrick May | may---001pat | 1888 | 6/30-9/12 | Auburn Yankees | Central New York League | Auburn, NY | |
| Patrick May | may---001pat | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | |
| Ed Mayer | mayer-001ed- | 1888 | 49 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Ed Mayer | mayer-001ed- | 1888 | Davenport | Central Interstate League | Davenport, IA | ||
| Ed Mayer | mayer-001ed- | 1888 | 8/25-9/30 | 25 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Ed Mayer | mayer-001ed- | 1888 | 10/2-10/7 | 6 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Al Mays | mays--001al- | 1888 | 18 g. | Brooklyn | American Association | Brooklyn, NY | |
| McAdams | mcadam002--- | 1888 | 8 g. | Chicago Putnams | ChicComm | Chicago, IL | |
| McAdams | 1888 | Burlington | Independent | Burlington, NJ | |||
| Jimmy McAleer | mcalee001jam | 1888 | 4/7-6/19 | Memphis Grays | Southern League | Memphis, TN | |
| Jimmy McAleer | mcalee001jam | 1888 | 6/23-10/7 | 85 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Paul McAlleny | mcalle000--- | 1888 | Waterbury | Connecticut State League | Waterbury, CT | ||
| McAllester | mcalli010--- | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Thomas McAndries | mcandr003tho | 1888 | Denver Solis | Independent | Denver, CO | ||
| Thomas McAndries | mcandr003tho | 1888 | 5/10- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| McAnif | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Peter McAtee | mcatee001pet | 1888 | 6/6-6/9 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Peter McAtee | mcatee001pet | 1888 | 6/20-7/14 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| D. McAuliffe | mcauli000d-- | 1888 | Elkhart | Indiana State League | Elkhart, IN | ||
| Daniel McAuliffe | mcauli001dan | 1888 | 4/30-6/9 | Portland | New England League | Portland, ME | |
| Daniel McAuliffe | mcauli001dan | 1888 | 6/12 | Nashua | New England Interstate League | Nashua, NH | |
| Daniel McAuliffe | mcauli001dan | 1888 | 7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| McCabe | 1888 | 6/2-8/1 | Chester Houston | PhilReg | Chester, PA | ||
| John McCabe | mccabe001joh | 1888 | 51 g. | Davenport | Central Interstate League | Davenport, IA | |
| John McCabe | mccabe001joh | 1888 | 8/8-10/7 | 50 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| McCaffrey | mccaff008--- | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| E. N. McCaffrey | 1888 | 5/9-8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Sparrow McCaffrey | mccaff001spa | 1888 | no g. | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| Sparrow McCaffrey | mccaff001spa | 1888 | no g. | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Thomas McCallum | mccall002tho | 1888 | 4/30-8/18 | 82 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Thomas McCallum | mccall002tho | 1888 | 8/23 | 1 g. | Chicago Maroons | Western Association | Chicago, IL |
| Thomas McCallum | mccall002tho | 1888 | 8/25-9/28 | 23 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Jack McCann | mccann001jac | 1888 | 4/22-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| McCarron | 1888 | 5/5-5/26 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| McCarron | mccarr004--- | 1888 | 7/4-8/2 | Easton | Central League | Easton, PA | |
| Thomas McCarron | 1888 | 7/17-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | ||
| McCarthy | mccart070--- | 1888 | 4/28-8/8 | Elmira | Central League | Elmira, NY | |
| McCarthy | 1888 | 10 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Paul McCarthy | mccart001pau | 1888 | 4 g. | Santa Cruz | California State League | Santa Cruz, CA | |
| Tommy McCarthy | mccart001tom | 1888 | -9/26 | 131 g. | St. Louis Browns | American Association | St. Louis, MO |
| James McCartney | mccart008jam | 1888 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | ||
| John McCarty | mccart014joh | 1888 | 5/1-10/9 | 38 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Al McCauley | mccaul001al- | 1888 | 8/26-9/30 | 24 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Jim McCauley | mccaul001jim | 1888 | 5/1-6/15 | 17 g. | Chicago Maroons | Western Association | Chicago, IL |
| William McCauley | mccaul002wil | 1888 | 51 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| William McCauley | mccaul002wil | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Bill McClellan | mcclel001bil | 1888 | -10/17 | 74 g. | Brooklyn | American Association | Brooklyn, NY |
| Bill McClellan | mcclel001bil | 1888 | 22 g. | Cleveland | American Association | Cleveland, OH | |
| Robert McClintock | mcclin002wil | 1888 | 5/8-6/14 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Bill McCloskey | mcclos001bil | 1888 | 4/28-6/9 | Portland | New England League | Portland, ME | |
| Bill McCloskey | mcclos001bil | 1888 | 6/20-7/13 | Buffalo Bisons | International Association | Buffalo, NY | |
| John McCloskey | mcclos001joh | 1888 | 4/8-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| John McCloskey | mcclos001joh | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| John McCloskey | mcclos001joh | 1888 | 7/18-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| McClosky | 1888 | 7/26-7/31 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| William? McCoach | 1888 | Chester | Independent | Chester, PA | |||
| Tom McCord | mccord001tom | 1888 | 3/29- | 24 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| McCormack | 1888 | 5/30-6/9 | Oswego | Eastern International League | Oswego, NY | ||
| McCormick | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Jerry McCormick | mccorm001jer | 1888 | Spring training | St. Louis Whites | Western Association | St. Louis, MO | |
| Jerry McCormick | mccorm001jer | 1888 | 6/21-7/18 | Easton | Central League | Easton, PA | |
| McCoy | 1888 | 5/5-8/11 | Chester Houston | PhilReg | Chester, PA | ||
| McCoy | 1888 | 8/1 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Pete McCoy | mccoy-001pet | 1888 | Springfield | Amat | Springfield, IL | ||
| McCracken | mccrac004--- | 1888 | Dover | New England Interstate League | Dover, DE | ||
| Joe McCrum | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN | |
| Charlie McCullough | mccull002cha | 1888 | 5/12-6/15 | Scranton Miners | Central League | Scranton, PA | |
| Charlie McCullough | mccull002cha | 1888 | 6/30-8/6 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| M. McDarby | mcdarb001m-- | 1888 | +6/19-6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| McDermott | mcderm014--- | 1888 | Dover | New England Interstate League | Dover, DE | ||
| Michael McDermott | mcderm003mic | 1888 | 5/4-7/31 | Manchester Maroons | New England League | Manchester, NH | |
| Michael McDermott | mcderm003mic | 1888 | 8/15-9/6 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Michael McDermott | mcderm003mic | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| Sandy McDermott | mcderm001san | 1888 | 4/23-9/21 | Umpire | TriSt | , | |
| Tom McDermott | mcderm005tho | 1888 | 4/28-9/29 | Easton | Central League | Easton, PA | |
| McDonald | 1888 | 6/6-6/16 | Norristown | PhilReg | Norristown, PA | ||
| McDonald | 1888 | 7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| J. McDonald | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | |||
| Jim McDonald | mcdona003jim | 1888 | 3/29- | 47 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| John McDonald | 1888 | no g. | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | ||
| McDonnell | 1888 | 6/20-6/23 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Henry McElhone | mcelho001hen | 1888 | 4/30-5/9 | Easton | Central League | Easton, PA | |
| Henry McElhone | mcelho001hen | 1888 | 5/26-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | |
| Henry McElhone | mcelho001hen | 1888 | Gloucester | Independent | Gloucester, NJ | ||
| Henry McElhone | mcelho001hen | 1888 | 7/4-9/26 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Jim McElroy | mcelro001jim | 1888 | Albuquerque | NMSt | Albuquerque, NM | ||
| Alex McFarlan | mcfarl002ale | 1888 | Newport | Independent | Newport, AR | ||
| Alex McFarlan | mcfarl002ale | 1888 | Jacksonville | Independent | Jacksonville, FL | ||
| Jack McFetridge | mcfetr001joh | 1888-89 | U. of Pennsylvania | College | , | ||
| John McFinley | 1888 | 2 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| McGafflin | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Chippy McGarr | mcgarr001chi | 1888 | 34 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Chippy McGarr | mcgarr001chi | 1888 | 7/13-10/7 | 63 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Jack McGeachey | mcgeac001jac | 1888 | 118 g. | Indianapolis | National League | Indianapolis, IN | |
| Charles McGettingen | mcgett001cha | 1888 | 5/26-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| McGinley | 1888 | 5/1-6/5+ | Umpire | CIntSt | , | ||
| Jumbo McGinnis | mcginn001jum | 1888 | 8/12 | MLB Umpire | American Association | , | |
| McGivern | mcgive002--- | 1888 | 1 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| McGivern | mcgive002--- | 1888 | Rochester Danfords | Independent | Rochester, NY | ||
| McGivern | mcgive002--- | 1888 | 6/30-9/15 | Penn Yan | Central New York League | Penn Yan, NY | |
| Peter Mcglade | mcglad001pet | 1888 | 28 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Peter Mcglade | mcglad001pet | 1888 | 2 g. | San Francisco | California State League | San Francisco, CA | |
| John McGlone | mcglon001joh | 1888 | 55 g. | Cleveland | American Association | Cleveland, OH | |
| Pat McGra | 1888 | no g. | Newark Trunkmakers | Central League | Newark, NJ | ||
| Pat McGra | 1888 | 6/5 | Hamilton Hams | International Association | Hamilton, ON | ||
| Pat McGra | 1888 | Elkhart | Indiana State League | Elkhart, IN | |||
| Pat McGraw | mcgra-001pat | 1888 | no g. | Newark Trunkmakers | Central League | Newark, NJ | |
| Pat McGraw | mcgra-001pat | 1888 | 6/5 | Hamilton Hams | International Association | Hamilton, ON | |
| Pat McGraw | mcgra-001pat | 1888 | Elkhart | Indiana State League | Elkhart, IN | ||
| Joe McGuckin | mcguck001joe | 1888 | 4/28-8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| Joe McGuckin | mcguck001joe | 1888 | 8/9-9/29 | Elmira | Central League | Elmira, NY | |
| McGuire | 1888 | 14 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Bernard McGuire | mcguir001ber | 1888 | 5/19-5/30 | Binghamton Crickets | Central League | Binghamton, NY | |
| Deacon McGuire | mcguir006jam | 1888 | 12 g. | Philadelphia | National League | Philadelphia, PA | |
| Deacon McGuire | mcguir006jam | 1888 | 3 g. | Detroit | National League | Detroit, MI | |
| Deacon McGuire | mcguir006jam | 1888 | 26 g. | Cleveland | American Association | Cleveland, OH | |
| Thomas McGuirk | mcguir004tho | 1888 | 4/28-8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| William McGuirk | mcguir004wil | 1888 | 7/16 | Lowell Chippies | New England League | Lowell, MA | |
| Bill McGunnigle | mcgunn001bil | 1888 | g. | Brooklyn | American Association | Brooklyn, NY | |
| Edward McGunnigle | 1888 | 5/14- | Umpire | NEIntSt | , | ||
| Edward McGunnigle | 1888 | 6/28 | MLB Umpire | National League | , | ||
| Edward McGunnigle | 1888 | 7/7-7/24 | Umpire | NE | , | ||
| Bob McHale | mchale001bob | 1888 | 1 g. | Sacramento | California State League | Sacramento, CA | |
| John McHale | mchale002joh | 1888 | 4/30-7/14 | Rochester Jingoes | International Association | Rochester, NY | |
| John McHale | mchale002joh | 1888 | 8/23-8/30 | Waterloo | Central New York League | Waterloo, NY | |
| John McHale | mchale002joh | 1888 | 9/3-9/21 | Rochester Jingoes | International Association | Rochester, NY | |
| James McIlvaine | mcilva001jam | 1888 | York Anchors | Independent | York, PA | ||
| Ed McKean | mckean001edw | 1888 | 131 g. | Cleveland | American Association | Cleveland, OH | |
| McKee | 1888 | 5/30-7/14 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| McKee | mckee-002--- | 1888 | 7/24-7/28 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| McKee | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| John McKee | mckee-005joh | 1888 | 4/28-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Jim McKeever | mckeev001jim | 1888 | 7/7-9/3 | Easton | Central League | Easton, PA | |
| McKenna | mckenn006--- | 1888 | 7/16 | Easton | Central League | Easton, PA | |
| McKenzie | 1888 | 5/23 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Larry McKeon | mckeon001lar | 1888 | 4 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Dave McKeough | mckeou001dav | 1888 | 4/10-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Dave McKeough | mckeou001dav | 1888 | 7/4-8/29 | Rochester Jingoes | International Association | Rochester, NY | |
| George McKeough | mckeou001geo | 1888 | 5/4 | Memphis Grays | Southern League | Memphis, TN | |
| George McKeough | mckeou001geo | 1888 | 5/12-5/19 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| George McKeough | mckeou001geo | 1888 | 6/27-6/30 | London Tecumsehs | International Association | London, ON | |
| George McKeough | mckeou001geo | 1888 | 18 g. | Waterloo | Central New York League | Waterloo, NY | |
| James McKinley | mckinl001jam | 1888 | 5/29-6/12 | Toronto Canucks | International Association | Toronto, ON | |
| James McKinley | mckinl001jam | 1888 | 7/12 | Canandaigua | Central New York League | Canandaigua, NY | |
| McKnight | 1888 | 5/9-7/11 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Barney McLaughlin | mclaug001bar | 1888 | 4/28-7/5 | Lowell Chippies | New England League | Lowell, MA | |
| Frank McLaughlin | mclaug001fra | 1888 | 4/14-4/24 | Dallas Hams | Texas League | Dallas, TX | |
| Frank McLaughlin | mclaug001fra | 1888 | 5/1-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Jim McLaughlin | mclaug001jim | 1888 | Lincoln Tree Planters | Western League | Lincoln, NE | ||
| Jim McLaughlin | mclaug001jim | 1888 | 7/14 | 1 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Tom McLaughlin | mclaug001tom | 1888 | 4/28-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| William McLaughlin | mclaug002wil | 1888 | 7 g. | Sacramento | California State League | Sacramento, CA | |
| William McLean | mclean001bil | 1888 | Umpire | Cent | , | ||
| Frank McMahon | mcmaho001fra | 1888 | Colorado Springs | Independent | Colorado Springs, CO | ||
| Sadie McMahon | mcmaho003joh | 1888 | 5/5-5/16 | West Chester Brandywine | PhilReg | West Chester, PA | |
| Thomas McMahon | mcmaho001tho | 1888 | Danville Browns | Central Interstate League | Danville, IL | ||
| Thomas McMahon | mcmaho001tho | 1888 | 7/4-7/10 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Will McMahon | 1888 | Colorado Springs | Independent | Colorado Springs, CO | |||
| Barney McManus | mcmanu001bar | 1888 | 18 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| George McMillan | mcmill001geo | 1888 | 4/23-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| McMonagle | mcmona001--- | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | ||
| James McMullin | mcmull001geo | 1888 | 4/15- | 2 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Peter McNabb | mcnabb001edg | 1888 | +5/12- | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| Peter McNabb | mcnabb001edg | 1888 | Newton | Western League | Newton, KS | ||
| John McNichol | 1888 | 6/25-7/7 | Belleville | Eastern International League | Belleville, NJ | ||
| Bid McPhee | mcphee001bid | 1888 | 111 g. | Cincinnati | American Association | Cincinnati, OH | |
| Jack McQuaid | mcquai001jac | 1888 | Umpire | So | , | ||
| Mart McQuaid | mcquai001mor | 1888 | 37 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Mox McQuery | mcquer001mox | 1888 | 4/28-9/19+ | Syracuse Stars | International Association | Syracuse, NY | |
| Pete McShannic | mcshan001pet | 1888 | 4/23-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Pete McShannic | mcshan001pet | 1888 | 9/15-10/13 | 26 g. | Pittsburgh | National League | Pittsburgh, PA |
| Trick McSorley | mcsorl001tri | 1888 | 37 g. | Davenport | Central Interstate League | Davenport, IA | |
| Trick McSorley | mcsorl001tri | 1888 | 8/10 | MLB Umpire | American Association | , | |
| Jim McTamany | mctama001jim | 1888 | 130 g. | Kansas City | American Association | Kansas City, MO | |
| Cal McVey | mcvey-001cal | 1888 | San Diego Hamiltons | Independent | San Diego, CA | ||
| Carl McVey | mcvey-001car | 1888 | 4/22-6/7 | Columbus Senators | Tri-State League | Columbus, OH | |
| Carl McVey | mcvey-001car | 1888 | 6/25-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| George McVey | mcvey-001geo | 1888 | 4/10-6/28 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| George McVey | mcvey-001geo | 1888 | 7/20-7/30 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| George McVey | mcvey-001geo | 1888 | 8/10-9/16 | Columbus Senators | Tri-State League | Columbus, OH | |
| Billy Meade | meade-001wil | 1888 | Holy Cross Col. | College | , | ||
| Billy Meade | meade-001wil | 1888 | 7/17-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| George Meakim | meakim001geo | 1888 | Hutchinson | Western League | Hutchinson, KS | ||
| Thomas Meara | meara-001tho | 1888 | 5/31-7/4 | Oswego | Eastern International League | Oswego, NY | |
| Thomas Meara | meara-001tho | 1888 | 27 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| Pete Meegan | meegan001pet | 1888 | 3/29- | 40 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Augustus Meehan | meehan001aug | 1888 | 4/28-5/5 | Binghamton Crickets | Central League | Binghamton, NY | |
| Jouett Meekin | meekin002jou | 1888 | New Albany Browns | Independent | New Albany, | ||
| Chris Meisel | meisel001chr | 1888 | 4/28-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| George Meister | meiste001geo | 1888 | 4/28-7/7 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| George Meister | meiste001geo | 1888 | 7/24-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| John Meister | meiste002joh | 1888 | 4/28-9/7 | Worcester Grays | New England League | Worcester, MA | |
| A.J. Melcher | melche001a-- | 1888 | 5/5-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | |
| William Mellon | mellon001wil | 1888 | Waterbury | Connecticut State League | Waterbury, CT | ||
| Mercur | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Merrill | 1888 | 3 g. | San Francisco | California State League | San Francisco, CA | ||
| Jack Messitt | messit001jac | 1888 | 5/10 | Omaha Omahogs/Lambs | Western Association | Omaha, NE | |
| Jack Messitt | messit001jac | 1888 | 6/4-8/11 | London Tecumsehs | International Association | London, ON | |
| Jack Messitt | messit001jac | 1888 | 8/15 | Rochester Jingoes | International Association | Rochester, NY | |
| Jack Messitt | messit001jac | 1888 | 8/23-9/18+ | Troy Trojans | International Association | Troy, NY | |
| William Metz | metz--001wil | 1888 | 5/23 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| William Metz | metz--001wil | 1888 | 7/11-7/18 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Len Meyers | meyers001len | 1888 | 5/7-7/21 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Lou Meyers | meyers001lou | 1888 | 4/7-4/24 | Charleston Seagulls | Southern League | Charleston, SC | |
| Matthew Micklejohn | mickle001mat | 1888 | 5/5-5/28 | Camden | PhilReg | Camden, NJ | |
| Matthew Micklejohn | mickle001mat | 1888 | 6/2-7/12 | Easton | Central League | Easton, PA | |
| Matthew Micklejohn | mickle001mat | 1888 | 8/9-8/14 | Norristown | PhilReg | Norristown, PA | |
| Billy Miles | miles-002bil | 1888 | 8/12 | Galveston Giants | Texas League | Galveston, TX | |
| Billy Miles | miles-002bil | 1888 | Galveston Giants | Texas-Southern League | Galveston, TX | ||
| Miller | miller045--- | 1888 | 5/30-6/7+ | Kingston | Eastern International League | Kingston, ON | |
| Miller | miller194--- | 1888 | Danbury | Connecticut State League | Danbury, CT | ||
| Miller | miller120--- | 1888 | 5/5-6/20 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Miller | 1888 | 5/16-8/9 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Albert Miller | miller009alb | 1888 | 5/1-7/3 | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Bob Miller | miller001bob | 1888 | 5/5-9/15 | Newark Trunkmakers | Central League | Newark, NJ | |
| Cyclone Miller | miller001cyc | 1888 | 4/25 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Dusty Miller | miller004cha | 1888 | Niagara Univ. | College | , | ||
| Dusty Miller | miller004cha | 1888 | 4/23-8/31 | Lima Lushers | Tri-State League | Lima, OH | |
| Frederick Miller | miller006fre | 1888 | 4/28-8/28 | Rochester Jingoes | International Association | Rochester, NY | |
| George Miller | miller005geo | 1888 | 103 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Joe Miller | miller005joe | 1888 | 4/30-10/7 | 105 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Lou Miller | miller006lou | 1888 | 6/5-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Richard Miller | miller012ric | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Richard Miller | miller012ric | 1888 | 6/11-6/30 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Richard Miller | miller012ric | 1888 | 8/2-8/16 | Mansfield | Tri-State League | Mansfield, OH | |
| Tommy Miller | miller194--- | 1888 | Danbury | Connecticut State League | Danbury, CT | ||
| Tommy Miller | miller002tom | 1888 | 6/30-9/25 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| W. Miller | miller008w-- | 1888 | 8/8-8/9 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| John Milligan | millig001joc | 1888 | 63 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Jack Millman | millma001jac | 1888 | no g. | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Jack Millman | millma001jac | 1888 | 5/5-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | |
| Jack Millman | millma001jac | 1888 | 8/1-8/14 | Norristown | PhilReg | Norristown, PA | |
| Mills | 1888 | 27 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Mills | mills-042--- | 1888 | +6/14 | Marion | Indiana State League | Marion, IN | |
| Lynn Mills | mills-001lyn | 1888 | 4/28-10/7 | 86 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| W. Minehan/m | 1888 | Danbury | Connecticut State League | Danbury, CT | |||
| Miner | miner-004--- | 1888 | 4/14 | San Francisco Pioneers | California League | San Francisco, CA | |
| Miner | miner-004--- | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| Dan Minnehan | minneh001dan | 1888 | 4/23-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Mitchell | mitche014--- | 1888 | 5/5 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| John Mitchell | mitche019joh | 1888 | 4/30-5/30 | Portland | New England League | Portland, ME | |
| John Mitchell | mitche019joh | 1888 | 6/8-8/1 | Salem Witches | New England League | Salem, MA | |
| Sam Moffet | moffet001sam | 1888 | 10 g. | Indianapolis | National League | Indianapolis, IN | |
| Sam Moffet | moffet001sam | 1888 | 7/30-8/7 | 2 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Vic Monet | monet-001vic | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| Frank Monroe | monroe002fra | 1888 | Fresno | Independent | Fresno, CA | ||
| Kid Monroe | monroe001dan | 1888 | 4/23-5/22 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Kid Monroe | monroe001dan | 1888 | 6/12-9/22 | Canton Nadjys | Tri-State League | Canton, OH | |
| George Moolic | moolic001geo | 1888 | 4/8-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| George Moolic | moolic001geo | 1888 | 7/11-8/5 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| George Moolic | moolic001geo | 1888 | 8/14-9/20 | 10 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| William Mooney | mooney002wil | 1888 | 4/28-6/6 | Elmira | Central League | Elmira, NY | |
| William Mooney | mooney002wil | 1888 | +6/25-8/6 | Watertown | Eastern International League | Watertown, NY | |
| William Mooney | mooney002wil | 1888 | 7 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| William Mooney | mooney002wil | 1888 | Lockport | Independent | Lockport, NY | ||
| Moore | moore-019--- | 1888 | 2 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Moore | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Moore | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Moore | 1888 | 7/25 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Moore | 1888 | Staten Island | Independent | Staten Island, NY | |||
| A. Moore | 1888 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |||
| Dutch Moore | moore-000dut | 1888 | Logansport | Indiana State League | Logansport, IN | ||
| Henry Moore | moore-004hen | 1888 | 3/29-4/22 | San Francisco Pioneers | California League | San Francisco, CA | |
| Henry Moore | moore-004hen | 1888 | 4/28- | 59 g. | Stockton | California League | Stockton, CA |
| Jerry Moore | moore-005jer | 1888 | 5/3-5/7 | Hamilton Hams | International Association | Hamilton, ON | |
| John Moore | moore-020joh | 1888 | Rochester Danfords | Independent | Rochester, NY | ||
| John Moore | moore-020joh | 1888 | 7/21 | Penn Yan | Central New York League | Penn Yan, NY | |
| M.Jay Moore | moore-003m-- | 1888 | 8/18- | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Moorhead | moorhe001--- | 1888 | 6/21-6/22 | Elmira | Central League | Elmira, NY | |
| Moorhead | moorhe001--- | 1888 | New York Monitors | Independent | New York, NY | ||
| Moorhead | moorhe001--- | 1888 | 8/2-8/16 | Easton | Central League | Easton, PA | |
| Moran | 1888 | 4 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Augie Moran | moran-002aug | 1888 | New York Reserves | Independent | New York, NY | ||
| Augie Moran | moran-002aug | 1888 | Worcester Grays | New England League | Worcester, MA | ||
| Eddie Moran | moran-001edd | 1888 | 2 g. | San Francisco | California State League | San Francisco, CA | |
| John Moran | moran-004joh | 1888 | 4/25-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Morgan | 1888 | Staten Island | Independent | Staten Island, NY | |||
| P. Morgan | 1888 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |||
| Moriarty | moriar003--- | 1888 | 7/14-7/18 | Scranton Miners | Central League | Scranton, PA | |
| Moriarty | moriar006--- | 1888 | 9/2-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| Gene Moriarty | moriar001gen | 1888 | 5/1-8/22 | 84 g. | Chicago Maroons | Western Association | Chicago, IL |
| Ed Morkin | markin001ed- | 1888 | +6/21+ | 11 g. | Davenport | Central Interstate League | Davenport, IA |
| A. H.? Morlock | 1888 | 7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| John Morrill | morril003joh | 1888 | 135 g. | Boston | National League | Boston, MA | |
| Ed Morris | morris002ed- | 1888 | 55 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Morrison | morris082--- | 1888 | 5/30 | Decatur | Central Interstate League | Decatur, IL | |
| Morrison | 1888 | 14 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Morrison | 1888 | 5/30-7/4 | Belleville | Eastern International League | Belleville, NJ | ||
| Morrison | 1888 | +8/14 | Brockville | Eastern International League | Brockville, ON | ||
| Morrison | 1888 | 5/30-6/23 | Kingston | Eastern International League | Kingston, ON | ||
| Morrison | 1888 | 8/4+ | Watertown | Eastern International League | Watertown, NY | ||
| Hank Morrison | morris001han | 1888 | 4/26-9/6 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Jack Morrison | morris003jac | 1888 | 4/23-6/2 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Jack Morrison | morris004jac | 1888 | 5/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Jack Morrison | morris004jac | 1888 | Oswego | Eastern International League | Oswego, NY | ||
| Jack Morrison | morris004jac | 1888 | Umpire | EInt | , | ||
| Mike Morrison | morris001mik | 1888 | 4 g. | Cleveland | American Association | Cleveland, OH | |
| Mike Morrison | morris001mik | 1888 | 7/14-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| Mike Morrison | morris003mik | 1888 | Jackson Jaxons | Tri-State League | Jackson, MI | ||
| Tom Morrison | morris002tom | 1888 | St. Louis | Amat | St. Louis, MO | ||
| Tom Morrissey | morris003tom | 1888 | 4/28-10/4 | 111 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Charlie Morton | morton002cha | 1888 | 5/27-9/4 | 25 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Sam Morton | morton001sam | 1888 | President | WestA | , | ||
| William Motz | motz--002wil | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | ||
| Frank Mountain | mounta002fra | 1888 | 5/20-7/16 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Mike Muldoon | muldoo001mik | 1888 | 5/21-5/24 | Allentown Peanuts | Central League | Allentown, PA | |
| Ed Mulhearn | mulhea000wil | 1888 | Marion | Indiana State League | Marion, IN | ||
| Will Mulhern | 1888 | +6/14+ | Marion | Indiana State League | Marion, IN | ||
| Dan Mulholland | mulhol001dan | 1888 | 6/14-7/12 | Columbus Senators | Tri-State League | Columbus, OH | |
| Dan Mulholland | mulhol001dan | 1888 | 8/3-8/30 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Cy Mulkey | mulkey001cyr | 1888 | , | ||||
| E.J. Mullally | mullal001e-- | 1888 | 4/8-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| E.J. Mullally | mullal001e-- | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| E.J. Mullally | mullal001e-- | 1888 | 7/14-8/2 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Tony Mullane | mullan001ton | 1888 | -8/6 | 51 g. | Cincinnati | American Association | Cincinnati, OH |
| Jim Mullee | mullee001jam | 1888 | 3/29- | 4 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Mullen | mullen011--- | 1888 | Dover | New England Interstate League | Dover, DE | ||
| J. F. Mullen | 1888 | 5/2-5/20..7/25 | Umpire | NE | , | ||
| Michael Mullen | mullen004mic | 1888 | 4/30-5/25 | Salem Witches | New England League | Salem, MA | |
| Michael Mullen | mullen004mic | 1888 | 5/29-6/5 | Portland | New England League | Portland, ME | |
| Michael Mullen | mullen004mic | 1888 | 6/8-6/9 | Salem Witches | New England League | Salem, MA | |
| Luke Mulligan | mullig001luk | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| Mullin | 1888 | 5/28-6/16 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| Joe Mulvey | mulvey001joe | 1888 | 100 g. | Philadelphia | National League | Philadelphia, PA | |
| John Mundell | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| Munsberger | 1888 | 5/30 | Norristown | PhilReg | Norristown, PA | ||
| Munyan | munyan001--- | 1888 | 6/9 | Mansfield | Tri-State League | Mansfield, OH | |
| John Munyan | munyan001joh | 1888 | 4/23-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Murphy | murphy087--- | 1888 | 2 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Murphy | 1888 | 7/18 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | ||
| Murphy | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Murphy | murphy066--- | 1888 | 9/27-9/29 | Easton | Central League | Easton, PA | |
| A.W. Murphy | murphy002a-- | 1888 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | ||
| Con Murphy | murphy001con | 1888 | 4/28-9/18+ | Syracuse Stars | International Association | Syracuse, NY | |
| Danny Murphy | murphy013dan | 1888 | 3/30-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Danny Murphy | murphy013dan | 1888 | 7/10-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| Danny Murphy | murphy013dan | 1888 | 8/17-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Henry Murphy | murphy002hen | 1888 | 5/26-5/29 | Memphis Grays | Southern League | Memphis, TN | |
| Jack Murphy | murphy004jac | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Jack Murphy | murphy004jac | 1888 | 8/9-9/12 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Jerry Murphy | 1888 | 8 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Joe Murphy | murphy003joe | 1888 | 5/27 & 6/20 | 2 g. | St. Louis Whites | Western Association | St. Louis, MO |
| John Murphy | murphy028joh | 1888 | Indianapolis | Indianapolis, IN | |||
| John Murphy | murphy009j-- | 1888 | 6/19-6/29 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Larry Murphy | murphy001lar | 1888 | 4/28-10/4 | 123 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Morgan Murphy | murphy001mor | 1888 | 4/30-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| Pat Murphy | murphy007pat | 1888 | 28 g. | New York | National League | New York, NY | |
| Tony Murphy | murphy001ton | 1888 | 4/30-9/29 | Scranton Miners | Central League | Scranton, PA | |
| W. Murphy | murphy002w-- | 1888 | +5/13- | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| William Murphy | murphy017wil | 1888 | 31 g. | Rockford | Central Interstate League | Rockford, IL | |
| Willie Murphy | murphy013wil | 1888 | , | ||||
| Murray | 1888 | +6/1-6/22 | Belleville | Eastern International League | Belleville, NJ | ||
| Billy Murray | murray007wil | 1888 | 5/14-6/12+ | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| Billy Murray | murray007wil | 1888 | 7/20-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Miah Murray | murray001mia | 1888 | 12 g. | Washington | National League | Washington, DC | |
| Miah Murray | murray001mia | 1888 | 8/20-9/14+ | London Tecumsehs | International Association | London, ON | |
| Michael Murray | 1888 | Rochester Ontarios | Independent | Rochester, NY | |||
| Tom Murray | murray008tho | 1888 | Lafayette | Indiana State League | Lafayette, IN | ||
| Tom Murray | murray008tho | 1888 | 9 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Tom Murray | murray002tom | 1888 | 4/1 | Stockton | California League | Stockton, CA | |
| Frank Musgrave | musgro001--- | 1888 | 3 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Jim Mutrie | mutrie001jam | 1888 | New York | National League | New York, NY | ||
| Myers | 1888 | 6/30-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Myers | myers-001--- | 1888 | 7/25-7/31 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Al Myers | myers-001al- | 1888 | 132 g. | Washington | National League | Washington, DC | |
| Billy Myers | myers-003bil | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| George Myers | myers-002geo | 1888 | 66 g. | Indianapolis | National League | Indianapolis, IN | |
| George Myers | 1888 | 5/5-7/14 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Henry Myers | myers-004hen | 1888 | 4/28-5/19 | Portland | New England League | Portland, ME | |
| Nagle | 1888 | 4 g. | San Francisco Emersons | California State League | San Francisco, CA | ||
| Nagle | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Tom Nagle | nagle-001tom | 1888 | 6/7-10/7 | 68 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Nash | nash--003--- | 1888 | 4/28-5/24 | Easton | Central League | Easton, PA | |
| Nash | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN | |
| Billy Nash | nash--001bil | 1888 | 135 g. | Boston | National League | Boston, MA | |
| Joe Neale | neale-001joe | 1888 | 4/22-6/28 | Columbus Senators | Tri-State League | Columbus, OH | |
| Thomas Neary | neary-001tho | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| George Nellins | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| George Nellins | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Nelson | 1888 | 6 g. | Oakland Clevelands | California State League | Oakland, CA | ||
| Bill Nelson | nelson001bil | 1888 | 16 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Candy Nelson | nelson001can | 1888 | 4/28-5/24 | Buffalo Bisons | International Association | Buffalo, NY | |
| Candy Nelson | nelson001can | 1888 | 6/4-9/19+ | Albany Governors | International Association | Albany, NY | |
| John Nelson | nelson008joh | 1888 | New York Gorhams | Independent | New York, NY | ||
| James Nerney | 1888 | 5/26-6/9 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Billy Newbert | newber001bil | 1888 | 3/29- | 23 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| G.? Newett | 1888 | 8/7 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| George Newett | 1888 | 5/5-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Fred Newman | newman002fre | 1888 | 51 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Fred Newman | newman002fre | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Jack Newman | newman002jac | 1888 | 40 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Frank Nicholas | nichol002fra | 1888 | 4/7-7/3 | Charleston Seagulls | Southern League | Charleston, SC | |
| Frank Nicholas | nichol002fra | 1888 | 7/30-10/1 | 28 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Sam Nicholl | nichol002sam | 1888 | 4/26-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Sam Nicholl | nichol002sam | 1888 | 10/5- | 8 g. | Pittsburgh | National League | Pittsburgh, PA |
| Nichols | nichol010--- | 1888 | 5/12 | Charleston Seagulls | Southern League | Charleston, SC | |
| Frank Nichols | 1888 | Birmingham Maroons | Southern League | Birmingham, AL | |||
| Kid Nichols | nichol006cha | 1888 | 4/16-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Kid Nichols | nichol006cha | 1888 | 7/6-10/7 | 18 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Tricky Nichols | nichol001tri | 1888 | 4/14-5/26 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Joseph Nicholson | nichol001a-- | 1888 | Spring training | Chicago Maroons | Western Association | Chicago, IL | |
| Joseph Nicholson | nichol001a-- | 1888 | 5/19-6/24 | 10 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Joseph Nicholson | nichol003--- | 1888 | 7/13-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Parson Nicholson | nichol001par | 1888 | 4/28-6/20 | 39 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Parson Nicholson | nichol001par | 1888 | 7/1-9/12 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Parson Nicholson | nichol001par | 1888 | 9/14- | 24 g. | Detroit | National League | Detroit, MI |
| Hugh Nicol | nicol-001hug | 1888 | 135 g. | Cincinnati | American Association | Cincinnati, OH | |
| John Nightingale | nighti001joh | 1888 | 4/23-4/25 | Mansfield | Tri-State League | Mansfield, OH | |
| Bill Niles | niles-001bil | 1888 | +5/23-7/27+ | Logansport | Indiana State League | Logansport, IN | |
| Harry Nolan | nolan-002har | 1888 | 7 g. | Oakland Clevelands | California State League | Oakland, CA | |
| Nick Nolan | 1888 | 2 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| George Nulton | nulton001geo | 1888 | 5/1- | 57 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| George Nulton | nulton001geo | 1888 | 8/2-10/7 | 46 g. | Chicago Maroons | Western Association | Chicago, IL |
| James Nunan | nunan-001jam | 1888 | 3/31- | 56 g. | San Francisco Pioneers | California League | San Francisco, CA |
| William Nusz | nusz--001emo | 1888 | 4/28-6/2 | Albany Governors | International Association | Albany, NY | |
| Fred Nyce | nyce--001fre | 1888 | 5/1-6/17 | 17 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Fred Nyce | nyce--001fre | 1888 | 7/6-8/23 | Hamilton Hams | International Association | Hamilton, ON | |
| O'Brien | obrien104--- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| O'Brien | obrien035--- | 1888 | 6/2 | Decatur | Central Interstate League | Decatur, IL | |
| O'Brien | obrien039--- | 1888 | 9/3-9/5 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| O'Brien | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | ||
| O'Brien | obrien090--- | 1888 | Salem Witches | New England League | Salem, MA | ||
| Billy O'Brien | obrien001bil | 1888 | 133 g. | Washington | National League | Washington, DC | |
| Cinders O'Brien | obrien001cin | 1888 | 4/23-6/18 | Lima Lushers | Tri-State League | Lima, OH | |
| Cinders O'Brien | obrien001cin | 1888 | 6/23- | 32 g. | Cleveland | American Association | Cleveland, OH |
| Darby O'Brien | obrien002dar | 1888 | 136 g. | Brooklyn | American Association | Brooklyn, NY | |
| Flick O'Brien | obrien001fli | 1888 | 7/30-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| Frank O'Brien | obrien006fra | 1888 | 5/5-7/16 | Mansfield | Tri-State League | Mansfield, OH | |
| Frank O'Brien | obrien006fra | 1888 | 7/20-9/1 | Umpire | TriSt | , | |
| George O'Brien | obrien005geo | 1888 | 39 g. | Rockford | Central Interstate League | Rockford, IL | |
| George O'Brien | obrien005geo | 1888 | Peoria Reds | Central Interstate League | Peoria, IL | ||
| Jack O'Brien | obrien002jac | 1888 | 57 g. | Baltimore | American Association | Baltimore, MD | |
| James O'Brien | obrien010jam | 1888 | 5/1- | 56 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| Jeremiah O'Brien | obrien002jer | 1888 | 4/28-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Jeremiah O'Brien | obrien002jer | 1888 | 9/3-9/15+ | London Tecumsehs | International Association | London, ON | |
| Jerry O'Brien | obrien001jer | 1888 | 4/22-8/26 | Columbus Senators | Tri-State League | Columbus, OH | |
| Jerry O'Brien | obrien001jer | 1888 | 9/13-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Jerry O'Brien | 1888 | Frankfort | Indiana State League | Frankfort, IN | |||
| Joe O'Brien | obrien002joe | 1888 | 4/23-7/19 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| M. O'Brien | obrien003m-- | 1888 | +5/9-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Pete O'Brien | obrien003pet | 1888 | Chicago Whitings | ChicCity | Chicago, IL | ||
| Tom O'Brien | obrien001tom | 1888 | 4/28-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| O'Connell | oconne002--- | 1888 | Nashua | New England Interstate League | Nashua, NH | ||
| Pat O'Connell | oconne002pat | 1888 | 4/30-9/17 | 84 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Thomas O'Connell | oconne002tho | 1888 | 4/28-9/7 | Worcester Grays | New England League | Worcester, MA | |
| O'Connor | oconno045--- | 1888 | 5/23-7/4 | Elkhart | Indiana State League | Elkhart, IN | |
| O'Connor | oconno045--- | 1888 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | ||
| Frank O'Connor | oconno001fra | 1888 | 5/14- | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| Frank O'Connor | oconno001fra | 1888 | 7/21-8/11 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Jack O'Connor | oconno006joh | 1888 | 36 g. | Cincinnati | American Association | Cincinnati, OH | |
| Mike O'Connor | oconno003mik | 1888 | 4/7-6/15 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Hank O'Day | oday--001han | 1888 | 47 g. | Washington | National League | Washington, DC | |
| Harry O'Day | oday--001har | 1888 | 3/29- | 67 g. | Stockton | California League | Stockton, CA |
| James O'Day | oday--001jam | 1888 | 5/17-9/14 | Umpire | TriSt | , | |
| O'Donnell | 1888 | 8/13 | Chester Houston | PhilReg | Chester, PA | ||
| J. O'Donnell | odonne001j-- | 1888 | 5/30-8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| M. O'Donnell | odonne001m-- | 1888 | 5/5-8/11 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| P. O'Donnell | 1888 | 5/9-6/20 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Tom O'Donnell | odonne002tom | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| O'Hara | 1888 | 1 g. | San Francisco Emersons | California State League | San Francisco, CA | ||
| O'Hara | ohara-003--- | 1888 | 7/6 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| O'Keefe | 1888 | Haverstraw | HudRiv | Haverstraw, NY | |||
| Dan O'Leary | oleary005dan | 1888 | 4/8-5/12 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Charles O'Neal | oneal-002cha | 1888 | Santa Fe | Independent | Santa Fe, NM | ||
| O'Neil | 1888 | 5/26-8/9 | Norristown | PhilReg | Norristown, PA | ||
| Ed O'Neil | oneil-001ed- | 1888 | Atlantic City | Independent | Atlantic City, NJ | ||
| James O'Neil | oneil-002jam | 1888 | 5/21-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| James O'Neil | oneil-002jam | 1888 | 7/13 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| James O'Neil | oneil-002jam | 1888 | 7/19-8/14 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| O'Neill | 1888 | 5/19-5/23 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Fred O'Neill | oneill001fre | 1888 | 5/7-5/30 | London Tecumsehs | International Association | London, ON | |
| Tip O'Neill | oneill001tip | 1888 | 130 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Tip O'Neill | oneill001nor | 1888 | 4/23-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Tip O'Neill | oneill001nor | 1888 | 9/10-9/2? | Allentown Peanuts | Central League | Allentown, PA | |
| O'Rourke | 1888 | Chester | Independent | Chester, PA | |||
| Frank O'Rourke | orourk001fra | 1888 | 4/28 | Portland | New England League | Portland, ME | |
| Frank O'Rourke | orourk001fra | 1888 | 5/11-6/8 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Frank O'Rourke | orourk001fra | 1888 | 6/18-7/10 | Toledo Maumees | Tri-State League | Toledo, OH | |
| James O'Rourke | orourk007jam | 1888 | 5/19-8/7 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Jim O'Rourke | orourk003jam | 1888 | 107 g. | New York | National League | New York, NY | |
| P.H. O'Rourke | orourk002p-- | 1888 | 4/28-6/2 | Salem Witches | New England League | Salem, MA | |
| Tim O'Rourke | orourk004tim | 1888 | 4/23-5/19 | Lima Lushers | Tri-State League | Lima, OH | |
| Tim O'Rourke | orourk003tim | 1888 | 6/4-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| Tim O'Rourke | orourk003tim | 1888 | 7/10-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Tim O'Rourke | orourk004tim | 1888 | Toledo Maumees | Tri-State League | Toledo, OH | ||
| Tom O'Rourke | orourk001tom | 1888 | 20 g. | Boston | National League | Boston, MA | |
| Tom O'Rourke | orourk001tom | 1888 | 8/9-9/3 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Tom O'Rourke | orourk001tom | 1888 | 9/12-9/28+ | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Dick O'Toole | otoole001dic | 1888 | Danbury | Connecticut State League | Danbury, CT | ||
| Oberlander | oberla001--- | 1888 | 5/2-5/30 | Mansfield | Tri-State League | Mansfield, OH | |
| Doc Oberlander | oberla001doc | 1888 | 5/16-6/2 | 3 g. | Cleveland | American Association | Cleveland, OH |
| Doc Oberlander | oberla001doc | 1888 | 6/20-7/31 | Toronto Canucks | International Association | Toronto, ON | |
| Doc Oberlander | oberla001doc | 1888 | 9/6-9/10 | Waterloo | Central New York League | Waterloo, NY | |
| Doc Oberlander | oberla001doc | 1888 | 9/12 | Toronto Canucks | International Association | Toronto, ON | |
| Kid Ogden | ogden-001lou | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | |
| Dave Oldfield | oldfie001dav | 1888 | 4/30-9/14+ | Toronto Canucks | International Association | Toronto, ON | |
| Oliphant | 1888 | Burlington | Independent | Burlington, NJ | |||
| Ollwell/Olwell | 1888 | 5/5-6/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Oranke? | 1888 | 6/27 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | ||
| Orbison | 1888 | Chester | Independent | Chester, PA | |||
| Henry Ormsbee | ormsbe001hen | 1888 | Watertown | Eastern International League | Watertown, NY | ||
| Dave Orr | orr---002dav | 1888 | 99 g. | Brooklyn | American Association | Brooklyn, NY | |
| Fred Osborne | osborn003fre | 1888 | NM | , | |||
| Charlie Osterhout | osterh001cha | 1888 | 6/5-6/21 | Easton | Central League | Easton, PA | |
| Charlie Osterhout | osterh001cha | 1888 | 4 g. | Waterloo | Central New York League | Waterloo, NY | |
| Charlie Osterhout | osterh001cha | 1888 | 6/30-8/14 | Kingston | Eastern International League | Kingston, ON | |
| Billy Otterson | otters001bil | 1888 | 4/26-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| J. Owens | 1888 | 5/5-6/9 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| J. Owens | 1888 | 7/16 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| J. Owens | 1888 | 7/21-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | ||
| Ed Pabst | pabst-001ed- | 1888 | 6/4-6/ | 6 g. | Decatur | Central Interstate League | Decatur, IL |
| Russell Pache | pache-001rus | 1888 | 6 g. | Stockton | California League | Stockton, CA | |
| Palmer | palmer008--- | 1888 | 4/15-7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| George Parego | 1888 | Cuban Giants | Independent | Cuban, | |||
| Harry Parker | parker004har | 1888 | 5/29-7/31 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Rank Parker | parker001ran | 1888 | 1 g. | Sacramento | California State League | Sacramento, CA | |
| Rank Parker | parker001ran | 1888 | 4 g. | Oakland Clevelands | California State League | Oakland, CA | |
| Parks | 1888 | +6/5-7/24 | Watertown | Eastern International League | Watertown, NY | ||
| George Parrott | 1888 | +5/14+ | Portland Willametts | Amat | Portland, OR | ||
| Jiggs Parrott | parrot001jig | 1888 | Portland Willametts | Amat | Portland, OR | ||
| Tom Parrott | parrot002tho | 1888 | Portland Willametts | Amat | Portland, OR | ||
| Charlie Parsons | parson002cha | 1888 | 4/30 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Charlie Parsons | parson002cha | 1888 | 6/15-9/25 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Patterson | 1888 | 5/26-6/4 | Norristown | PhilReg | Norristown, PA | ||
| Elmer Patterson | 1888 | Genessee | Independent | Genessee, NY | |||
| Elmer Patterson | 1888 | 6/30-7/4 | Auburn Yankees | Central New York League | Auburn, NY | ||
| Elmer Patterson | 1888 | Rochester Sachs-Prudens | Independent | Rochester, NY | |||
| Owen Patton | patton001owe | 1888 | 4/30-7/15 | 57 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Owen Patton | patton001owe | 1888 | 7/17-8/15 | 23 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Owen Patton | patton001owe | 1888 | 8/17-8/18 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Victor Paul | 1888 | 5/5-7/21 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| James Payne | 1888 | Cuban Giants | Independent | Cuban, | |||
| Elias Peak | peak--001eli | 1888 | 4/7-5/8 | Charleston Seagulls | Southern League | Charleston, SC | |
| Elias Peak | peak--001eli | 1888 | 5/31-6/26 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Elias Peak | peak--001eli | 1888 | 7/4-9/11 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Pearson | 1888 | 15 g. | Waterloo | Central New York League | Waterloo, NY | ||
| George Pechiney | pechin001geo | 1888 | 4/24-7/16 | Canton Nadjys | Tri-State League | Canton, OH | |
| Frank Peckenpaugh | pecken001f-- | 1888 | 5/15-5/29 | Mansfield | Tri-State League | Mansfield, OH | |
| Chick Pedroes | pedro-001cha | 1888 | 8 g. | Chicago | ChicCom-Amateur | Chicago, IL | |
| Chick Pedroes | pedro-001cha | 1888 | 9/23-10/7 | 6 g. | Chicago Maroons | Western Association | Chicago, IL |
| William Peeples | peeple001wil | 1888 | 4/7-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| William Peeples | peeple001wil | 1888 | 7/10-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| John Peltz | peltz-001joh | 1888 | 4/7-6/28 | Memphis Grays | Southern League | Memphis, TN | |
| John Peltz | peltz-001joh | 1888 | 7/4-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| John Peltz | peltz-001joh | 1888 | 1 g. | Baltimore | American Association | Baltimore, MD | |
| Bob Pender | pender001rob | 1888 | 4/23-4/30 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Bob Pender | pender001rob | 1888 | Albuquerque | NM | Albuquerque, NM | ||
| John Pendergrass | pender002joh | 1888 | 4/28-5/30 | Albany Governors | International Association | Albany, NY | |
| Frank Penn | 1888 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |||
| Harry Penn | penn--001har | 1888 | 5/26-6/6 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Harry Penn | penn--001har | 1888 | Millville | Independent | Millville, NJ | ||
| Jimmy Peoples | people001jim | 1888 | 32 g. | Brooklyn | American Association | Brooklyn, NY | |
| Charles Pero | pero--001cha | 1888 | Nashua | New England Interstate League | Nashua, NH | ||
| Hip Perrier | perrie001hyp | 1888 | 3/29 - | 67 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Peters | 1888 | 5/16-6/9 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Peters | 1888 | 6/26-8/14 | Norristown | PhilReg | Norristown, PA | ||
| John Peters | peters009joh | 1888 | no g. | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| William Peters | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| Pat Pettee | pettee001pat | 1888 | 4/28-8/7 | 71g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Pat Pettee | pettee001pat | 1888 | 8/22-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| Jack Pettiford | pettif002jac | 1888 | 4/9-4/21 | Dallas Hams | Texas League | Dallas, TX | |
| Jack Pettiford | pettif002jac | 1888 | 5/1-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Jack Pettiford | pettif002jac | 1888 | Albuquerque | NMSt | Albuquerque, NM | ||
| Bob Pettit | pettit001bob | 1888 | 43 g. | Chicago | National League | Chicago, IL | |
| Charlie Petty | petty-002cha | 1888 | Selma Pastimes | Amat | Selma, AL | ||
| Charlie Petty | petty-002cha | 1888 | 5/7 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Fred Pfeffer | pfeffe001fre | 1888 | 135 g. | Chicago | National League | Chicago, IL | |
| Phalen | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| William Pheiffer | 1888 | no g. | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | ||
| Dan Phelan | phelan001dan | 1888 | Waterbury | Connecticut State League | Waterbury, CT | ||
| Dick Phelan | phelan001dic | 1888 | 4/7-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Dick Phelan | phelan001dic | 1888 | 7/4-8/30 | 42 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Dick Phelan | phelan001dic | 1888 | 9/1-10/9 | Des Moines Prohibitionists | Western Association | Des Moines, IA | |
| Ed Phelan | phelan001ed- | 1888 | 4/24-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Phillips | 1888 | Burlington | Independent | Burlington, NJ | |||
| Bill Phillips | philli001bil | 1888 | 129 g. | Kansas City | American Association | Kansas City, MO | |
| Horace Phillips | philli001hor | 1888 | Pittsburgh | National League | Pittsburgh, PA | ||
| Ira Phillips | philli001ira | 1888 | 53 g. | Davenport | Central Interstate League | Davenport, IA | |
| Ira Phillips | philli001ira | 1888 | 8/26 | 1 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Marr Phillips | philli003mar | 1888 | 4/28-9/17 | Hamilton Hams | International Association | Hamilton, ON | |
| John Pickett | picket001joh | 1888 | 4/28-10/3 | 122 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Pierce | pierce015--- | 1888 | 6/2 | London Tecumsehs | International Association | London, ON | |
| Gracie Pierce | pierce001gra | 1888 | 6/- | Umpire | Cent | , | |
| J. Pierce | 1888 | Norwalk | Connecticut State League | Norwalk, CT | |||
| J. Pierce | 1888 | +6/4-8/14 | Kingston | Eastern International League | Kingston, ON | ||
| Charles Pike | pike--002cha | 1888 | 4/22-5/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Charles Pike | pike--002cha | 1888 | 6/11-6/15 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Charles Pike | pike--002cha | 1888 | 6/25-9/8 | Toledo Maumees | Tri-State League | Toledo, OH | |
| George Pinkney | pinkne001geo | 1888 | 143 g. | Brooklyn | American Association | Brooklyn, NY | |
| James Pirie | pirie-001jam | 1888 | 5/26-5/30 | London Tecumsehs | International Association | London, ON | |
| Herman Pitz | pitz--001her | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | ||
| Herman Pitz | pitz--001her | 1888 | 5/8-9/25 | Elmira | Central League | Elmira, NY | |
| Charles Pitzer | pitzer001cha | 1888 | Birmingham Maroons | Southern League | Birmingham, AL | ||
| L.O. Platt | platt-001l-- | 1888 | 5/1-7/5 | Danville Browns | Central Interstate League | Danville, IL | |
| Walter Plock | plock-001wal | 1888 | Philadelphia Reserves | Independent | Philadelphia, PA | ||
| Walter Plock | plock-001wal | 1888 | Allen Grays | Independent | Allen, | ||
| Plummer | plumme002--- | 1888 | 5/5-8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| Mark Polhemus | polhem001mar | 1888 | 4/28-8/21 | Lowell Chippies | New England League | Lowell, MA | |
| Mark Polhemus | polhem001mar | 1888 | 9/10-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| Thomas Pollard | pollar001tho | 1888 | Philadelphia Kensington | Independent | Philadelphia, PA | ||
| Thomas Pollard | pollar002tho | 1888 | 5/19-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Thomas Pollard | pollar002tho | 1888 | 7/12-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Thomas Pollard | pollar002tho | 1888 | Chester | Independent | Chester, PA | ||
| Tom Poorman | poorma001tom | 1888 | 97 g. | Philadelphia | American Association | Philadelphia, PA | |
| Arthur Pope | pope--001art | 1888 | 6 g. | San Francisco | California State League | San Francisco, CA | |
| Fred Popkay | popkay001fre | 1888 | Detroit Cass | Independent | Detroit, MI | ||
| Fred Popkay | popkay001fre | 1888 | +5/9-5/17 | Elkhart | Indiana State League | Elkhart, IN | |
| Fred Popkay | popkay001fre | 1888 | 5/19-5/31 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Henry Porter | porter001hen | 1888 | 55 g. | Kansas City | American Association | Kansas City, MO | |
| Abner Powell | powell001abn | 1888 | 4/7-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Abner Powell | powell001abn | 1888 | 7/11-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Jim Powell | powell002jim | 1888 | 4/7-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Jim Powell | powell002jim | 1888 | 7/20-10/1 | 58 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Charles Power | powers002cha | 1888 | Umpire | WestA | , | ||
| Tom Power | power-001tom | 1888 | 3/29 - | 64 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Powers | powers001--- | 1888 | Dover | New England Interstate League | Dover, DE | ||
| Jim Powers | powers002jim | 1888 | Long Island Senators | Independent | Long Island, NY | ||
| Jim Powers | powers002jim | 1888 | Flushing | Independent | Flushing, NY | ||
| Pat Powers | powers001pat | 1888 | 4/28-9/29 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Phil Powers | powers001phi | 1888 | 5/1-6/14 | London Tecumsehs | International Association | London, ON | |
| Phil Powers | powers001phi | 1888 | 53 g. | MLB Umpire | National League | , | |
| Practer | practe001--- | 1888 | 6/11- | Newton | Western League | Newton, KS | |
| Fred Pranter | prante001fre | 1888 | 7/4-8/9 | 16 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| William Prescott | presco001wil | 1888 | 26 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| William Prescott | presco001wil | 1888 | 8/2 | Elkhart | Indiana State League | Elkhart, IN | |
| Price | 1888 | 7/30 | Chester Houston | PhilReg | Chester, PA | ||
| Bill Price | price-001bil | 1888 | 5/9-8/9 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| Luther Price | 1888 | Princeton Univ. | College | , | |||
| Luther Price | 1888 | Cape May | Independent | Cape May, NJ | |||
| William Price | 1888 | Princeton Univ. | College | , | |||
| William Price | 1888 | Cape May | Independent | Cape May, NJ | |||
| Priest | 1888 | no g. | Salem Witches | New England League | Salem, MA | ||
| Priest | priest008--- | 1888 | 9/22 | Troy Trojans | International Association | Troy, NY | |
| Walter Prince | prince001wal | 1888 | 4/28-5/26 | Portland | New England League | Portland, ME | |
| Walter Prince | prince001wal | 1888 | 5/29-7/14 | Salem Witches | New England League | Salem, MA | |
| Walter Prince | prince001wal | 1888 | North Andover | Independent | North Andover, MA | ||
| Walter Prince | prince001wal | 1888 | 8/3-8/6 | Watertown | Eastern International League | Watertown, NY | |
| Walter Prince | prince001wal | 1888 | 8/11-9/15+ | London Tecumsehs | International Association | London, ON | |
| George Pritchard | 1888 | Aberdeen Nonpareil | Independent | Aberdeen, SD | |||
| George Proeser | proese001geo | 1888 | 4/8-5/14 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| George Proeser | proese001geo | 1888 | 5/22-7/8 | Galveston Giants | Texas League | Galveston, TX | |
| George Proeser | proese001geo | 1888 | 7/11-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| George Proeser | proese001geo | 1888 | 9/15 - | 7 g. | Cleveland | American Association | Cleveland, OH |
| Jules Pujol | pujol-001jul | 1888 | 4/25-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| Jules Pujol | pujol-001jul | 1888 | 7/11-7/13 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Jules Pujol | pujol-001jul | 1888 | 7/25-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| Blondie Purcell | purcel001blo | 1888 | 101 g. | Baltimore | American Association | Baltimore, MD | |
| Blondie Purcell | purcel001blo | 1888 | 18 g. | Philadelphia | American Association | Philadelphia, PA | |
| Joseph Purcell | 1888 | 3/31- | 56 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| James Purvis | purvis002jam | 1888 | 4/28-6/4 | Hamilton Hams | International Association | Hamilton, ON | |
| James Purvis | purvis002jam | 1888 | 7/2 | Oswego | Eastern International League | Oswego, NY | |
| Fred Putnam | 1888 | 2 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Harry Putnam | putnam001har | 1888 | Salem Witches | New England League | Salem, MA | ||
| Harry Putnam | putnam001har | 1888 | ?-9/29 | Easton | Central League | Easton, PA | |
| Harry Pyle | pyle--001sha | 1888 | 4/30-8/16 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| C. Quade | quade-001c-- | 1888 | 5/1-7/8 | Dubuque | Central Interstate League | Dubuque, IA | |
| Joe Quest | quest-001joe | 1888 | Spring training | St. Paul Apostles | Western Association | St. Paul, MN | |
| Joe Quest | quest-001joe | 1888 | 5/9-7/9 | Lowell Chippies | New England League | Lowell, MA | |
| Joe Quest | quest-001joe | 1888 | Umpire | Western Association | , | ||
| William Quick | 1888 | 7/21 | Philadelphia Kensington | PhilReg | Philadelphia, PA | ||
| Joseph Quigley | 1888 | Bradford | Independent | Bradford, PA | |||
| Quinlan | 1888 | +6/4-7/30 | Belleville | Eastern International League | Belleville, NJ | ||
| Quinlan | 1888 | +8/6-8/11 | Brockville | Eastern International League | Brockville, ON | ||
| Quinn | quinn-022--- | 1888 | 4/8 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Quinn | quinn-012--- | 1888 | 7/24-8/1 | Houston Babies | Texas-Southern League | Houston, TX | |
| Quinn | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Daniel Quinn | quinn-002dan | 1888 | 4/28-8/16 | Easton | Central League | Easton, PA | |
| Jack Quinn | quinn-001jac | 1888 | 4/30-8/8 | London Tecumsehs | International Association | London, ON | |
| Jack Quinn | quinn-001jac | 1888 | 8/13 | Troy Trojans | International Association | Troy, NY | |
| Joe Quinn | quinn-003jos | 1888 | 4/28-8/24 | 78 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Joe Quinn | quinn-003jos | 1888 | 38 g. | Boston | National League | Boston, MA | |
| Tom Quinn | quinn-001tom | 1888 | 4/28-9/19+ | Albany Governors | International Association | Albany, NY | |
| Maurice Quirk | quirk-002--- | 1888 | Danbury | Connecticut State League | Danbury, CT | ||
| Maurice Quirk | quirk-002--- | 1888 | 17 g. | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Maurice Quirk | quirk-002--- | 1888 | Danbury | Independent | Danbury, CT | ||
| M. Quitsow | quitzo001--- | 1888 | 5/16-5/21 | Lima Lushers | Tri-State League | Lima, OH | |
| M. Quitsow | quitzo001--- | 1888 | +5/27+ | 16 g. | Chicago Franklins | ChicCity | Chicago, IL |
| M. Quitsow | quitzo001--- | 1888 | +6/11+ | Chicago Reserves | Independent | Chicago, IL | |
| Old Hoss Radbourn | radbou001old | 1888 | 24 g. | Boston | National League | Boston, MA | |
| John Rademacher | rodema002joh | 1888 | 4/7-6/24 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Paul Radford | radfor002pau | 1888 | 90 g. | Brooklyn | American Association | Brooklyn, NY | |
| Rafferty | 1888 | 24 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Jack Rafferty | raffer001joh | 1888 | Hutchinson | Western League | Hutchinson, KS | ||
| Jack Rafferty | raffer001joh | 1888 | 7/10-7/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Jack Rafferty | raffer001joh | 1888 | 8/14 | Mansfield | Tri-State League | Mansfield, OH | |
| Jack Rafferty | raffer001joh | 1888 | 8/19 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Jack Rafferty | raffer001joh | 1888 | 9/22 | Toledo Maumees | Tri-State League | Toledo, OH | |
| John Rainey | rainey001joh | 1888 | 4/28-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| Ramsey | ramsey014--- | 1888 | 6/11-7/4 | Canton Nadjys | Tri-State League | Canton, OH | |
| Bud Ramsey | 1888 | 4/16- | Covington | Independent | Covington, KY | ||
| Toad Ramsey | ramsey001toa | 1888 | 42 g. | Louisville | American Association | Louisville, KY | |
| Randall | randal002--- | 1888 | 6/12 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Randall | randal002--- | 1888 | 6/15-6/28 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Dud Randall | randal001dud | 1888 | 4/28-5/2 | Mansfield | Tri-State League | Mansfield, OH | |
| Andrew Randolph | 1888 | Cuban Giants | Independent | Cuban, | |||
| Ranlett | 1888 | 3 g. | Sacramento | California State League | Sacramento, CA | ||
| Raphaele | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | ||
| Raskalt | raskal001--- | 1888 | 6/1 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| John Ratton | 1888 | no g. | Ashland | Central Pennsylvania League | Ashland, PA | ||
| Irv Ray | ray---001irv | 1888 | Maine A&M | College | , | ||
| Irv Ray | ray---001irv | 1888 | 4/28-6/28 | Salem Witches | New England League | Salem, MA | |
| Irv Ray | ray---001irv | 1888 | 7/7 - | 50 g. | Boston | National League | Boston, MA |
| Harry Raymond | raymon002har | 1888 | 4/8-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Harry Raymond | raymon002har | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Harry Raymond | raymon002har | 1888 | 7/14-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Harry Raymond | raymon002har | 1888 | 9/9 - | 32 g. | Louisville | American Association | Louisville, KY |
| Reagles | 1888 | 5/30-5/31 | Oswego | Eastern International League | Oswego, NY | ||
| Park Reamer | 1888 | Las Cruces | NMSt | Las Cruces, | |||
| Reardon | 1888 | 5/30-6/18 | Norristown | PhilReg | Norristown, PA | ||
| Reardon | reardo005--- | 1888 | 20 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Jimmy Reardon | reardo002jam | 1888 | 5/19-6/26 | Albany Governors | International Association | Albany, NY | |
| Jimmy Reardon | reardo002jam | 1888 | 4 g. | Waterloo | Central New York League | Waterloo, NY | |
| Reber/Reiber | 1888 | 5/5-5/16 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| John Reccius | 1888 | Louisville Eclipse | Independent | Louisville, KY | |||
| Phil Reccius | recciu002phi | 1888 | 4/7-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Phil Reccius | recciu002phi | 1888 | 2 g. | Louisville | American Association | Louisville, KY | |
| Phil Reccius | recciu002phi | 1888 | 7/20-10/1 | 58 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Lew Redmond | redmon001lew | 1888 | 4 g. | Oakland Clevelands | California State League | Oakland, CA | |
| Reed | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Icicle Reeder | reeder001ici | 1888 | 4/23-6/15 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Reedy | reedy-000--- | 1888 | +6/14+ | Marion | Indiana State League | Marion, IN | |
| J. Reese | 1888 | 5/26-8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| John Reeves | reeves003joh | 1888 | 5/2- | 41 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| Fred Rehse | rehse-001--- | 1888 | 5/15 & 8/15 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Billy Reid | reid--001bil | 1888 | 6/4-7/20 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Billy Reid | reid--001bil | 1888 | 8/15-9/14 | Umpire | TriSt | , | |
| John Reidy | reidy-002joh | 1888 | 4/30-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Reilly | reilly002--- | 1888 | 7/14-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Charlie Reilly | reilly003cha | 1888 | 4/28-10/4 | 107 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Jim Reilly | reilly001joe | 1888 | New York Bergen Points | Independent | New York, NY | ||
| Jim Reilly | reilly001joe | 1888 | New York Manhattanville | Independent | New York, NY | ||
| John Reilly | reilly004joh | 1888 | 127 g. | Cincinnati | American Association | Cincinnati, OH | |
| Josh Reilly | reilly002wil | 1888 | 2 g. | San Francisco | California State League | San Francisco, CA | |
| Josh Reilly | reilly002wil | 1888 | 1 g. | San Francisco Emersons | California State League | San Francisco, CA | |
| John Reinagle | reinag001joh | 1888 | 48 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Charlie Reipschlager | reipsc001cha | 1888 | 4/28-7/17 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| Charlie Reising | reisin001cha | 1888 | 54 g. | Davenport | Central Interstate League | Davenport, IA | |
| Reisinger | reisin001--- | 1888 | 6/5-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Reisinger | reisin001--- | 1888 | 7/11-7/13 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Reisinger | reisin001--- | 1888 | 7/20 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Henry Reitz | reitz-001hen | 1888 | Athletics | Independent | , | ||
| Jack Remsen | remsen001jac | 1888 | 4/28-7/10 | Buffalo Bisons | International Association | Buffalo, NY | |
| Jack Remsen | remsen001jac | 1888 | 22 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| Louis Renner | renner001lou | 1888 | 4/28-7/28 | London Tecumsehs | International Association | London, ON | |
| Louis Renner | renner001lou | 1888 | 8/23-8/24 | Elmira | Central League | Elmira, NY | |
| Rensler? Renssalaer | 1888 | 1 g. | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Charles Reuter | ruter-001c-- | 1888 | 5/24-9/29 | Allentown Peanuts | Central League | Allentown, PA | |
| Reynolds | reynol036--- | 1888 | 6/1 | 1 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Charlie Reynolds | reynol006cha | 1888 | 5/2-10/8 | 42 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Christy Reynolds | reynol003chr | 1888 | 4/23-5/12 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Frank Rheims | rheims001fra | 1888 | 4/25-5/17 | Lima Lushers | Tri-State League | Lima, OH | |
| Frank Rheims | rheims001fra | 1888 | 6/13-10/7 | 84 g. | Chicago Maroons | Western Association | Chicago, IL |
| Billy Rhines | rhines001wil | 1888 | Bucknell Univ. | College | , | ||
| Billy Rhines | rhines001wil | 1888 | 4/30-7/14 | Binghamton Crickets | Central League | Binghamton, NY | |
| Billy Rhines | rhines001wil | 1888 | 7/17-9/13 | Jersey City Skeeters | Central League | Jersey City, NJ | |
| W. Rhoades | 1888 | 8/7 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Rhoads | 1888 | 5/12-8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| George Rhue | rhue--001geo | 1888 | 4/26-8/6 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| George Rhue | rhue--001geo | 1888 | 8/8-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Richards | 1888 | 7/14 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| L. W. Richards | 1888 | 5/5-8/14 | Chester Houston | PhilReg | Chester, PA | ||
| Richardson | 1888 | Chester | Independent | Chester, PA | |||
| Arthur Richardson | richar001art | 1888 | 3 g. | Waterloo | Central New York League | Waterloo, NY | |
| Arthur Richardson | richar001art | 1888 | +5/9-6/26 | Elkhart | Indiana State League | Elkhart, IN | |
| Danny Richardson | richar002dan | 1888 | 135 g. | New York | National League | New York, NY | |
| Hardy Richardson | richar001har | 1888 | 58 g. | Detroit | National League | Detroit, MI | |
| J.R. Richardson | richar004j-- | 1888 | Camden | Independent | Camden, DE | ||
| Richie | 1888 | 6/2 | Norristown | PhilReg | Norristown, PA | ||
| Richmond | 1888 | 6/6-6/20 | Camden | PhilReg | Camden, NJ | ||
| R. Richmond | 1888 | Derby | Connecticut State League | Derby, CT | |||
| Chris Rickley | rickle001chr | 1888 | 4/28-9/11+ | Toronto Canucks | International Association | Toronto, ON | |
| John Ricks | ricks-001joh | 1888 | St. Louis | Amat | St. Louis, MO | ||
| John Riddle | riddle005joh | 1888 | +5/19- | Philadelphia Young Americans | Independent | Philadelphia, PA | |
| John Riddle | riddle005joh | 1888 | 7/16-7/17 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| A. Ridley | ridley001a-- | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | ||
| A. Ridley | ridley001a-- | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Rigby | rigby-002--- | 1888 | Milford | Independent | Milford, DE | ||
| Joseph Rigby | rigby-001jos | 1888 | 5/5-8/14 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| Robert Rigby | rigby-001rob | 1888 | Philadelphia Solar Tips | Independent | Philadelphia, PA | ||
| Riley | riley-017--- | 1888 | 4/27-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Riley | riley-024--- | 1888 | 4/24 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Jack Riley | 1888 | 1 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Riley/Reilly | 1888 | 6/25-7/4 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Frank Ringo | ringo-001fra | 1888 | 5/15-8/3 | 32 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Frank Rinn | rinn--002fra | 1888 | 5/19-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| Frank Rinn | rinn--002fra | 1888 | 7/12 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Frank Rinn | rinn--002fra | 1888 | 7/17-8/10 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Tim Riordan | riorda001tim | 1888 | 5/30-7/4 | Oswego | Eastern International League | Oswego, NY | |
| Tim Riordan | riorda001tim | 1888 | 28 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| William Rittenhouse | ritten001wil | 1888 | 5/19-7/2 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| William Rittenhouse | ritten001wil | 1888 | 7/11-8/1 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| John Roach | roach-003joh | 1888 | 4/30-9/28 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| John Roach | roach-005joh | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| John Roach | roach-005joh | 1888 | 7/24-7/26 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Fred Roat | roat--001fre | 1888 | 39 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Carroll Roberts | robert002car | 1888 | 5/1- | 58 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| Fred Roberts | robert004fre | 1888 | 3 g. | Oakland Clevelands | California State League | Oakland, CA | |
| Fred Roberts | robert004fre | 1888 | 2 g. | San Francisco Emersons | California State League | San Francisco, CA | |
| Charley Robertson | robert011cha | 1888 | 7 g. | Sacramento | California State League | Sacramento, CA | |
| Robinson | 1888 | Chester | Independent | Chester, PA | |||
| Myers Robinson | robins001mye | 1888 | 4/30-5/6 | 4 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Myers Robinson | robins001mye | 1888 | 5/12-6/19 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Myers Robinson | robins001mye | 1888 | 6/25 | Lima Lushers | Tri-State League | Lima, OH | |
| Thomas Robinson | 1888 | Oakland Greenhood & Morans | California League | Oakland, CA | |||
| Wilbert Robinson | robins001wil | 1888 | 66 g. | Philadelphia | American Association | Philadelphia, PA | |
| William Robinson | robins001yan | 1888 | 134 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Daniel Roche | roche-002dan | 1888 | 4/28-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| William Roche | roche-003wil | 1888 | 13 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Billy Rockwell | rockwe001elm | 1888 | Davenport | Independent | Davenport, IA | ||
| Clifford Roecker | roecke001cli | 1888 | 5/5-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | |
| Herman Roecker | 1888 | 5/5-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| Rogers | rogers050--- | 1888 | -8/ | Logansport | Indiana State League | Logansport, IN | |
| Rogers | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Rogers | rogers024--- | 1888 | Haverhill | New England Interstate League | Haverhill, MA | ||
| Emmett Rogers | rogers002emm | 1888 | 4/7-6/22 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Emmett Rogers | rogers002emm | 1888 | 7/14-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Rohan | rohan-001--- | 1888 | 5 g. | Oakland Tribunes | California State League | Oakland, CA | |
| Roick | 1888 | 14 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Pat Rollins | rollin001hen | 1888 | 5/19-8/10 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| George Rooks | rooks-001geo | 1888 | 5/1-5/15 | 9 g. | Chicago Maroons | Western Association | Chicago, IL |
| George Rooks | rooks-001geo | 1888 | 5/24-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| Frank Rorke | 1888 | 5/5-6/4 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Frank Rorke | 1888 | 7/17 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| H.E. Rosbrugh | rosbru001h-- | 1888 | 4/25-5/10 | Mansfield | Tri-State League | Mansfield, OH | |
| Robert Rose | rose--007rob | 1888 | 5/?-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| James Roseman | rosema001chi | 1888 | 6/5-8/2 | Albany Governors | International Association | Albany, NY | |
| Alex Ross | ross--001ale | 1888 | , | ||||
| George Ross | ross--008--- | 1888 | Danville | Amat | Danville, PA | ||
| Rouen | rouen-001--- | 1888 | 5/19-6/13 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Billy Rourke | rourke001wil | 1888 | 4/22-5/14 | Columbus Senators | Tri-State League | Columbus, OH | |
| Billy Rourke | rourke001wil | 1888 | 5/29-5/31 | Lima Lushers | Tri-State League | Lima, OH | |
| Elmer Roussey | rousse002elm | 1888 | 4/28-8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| Elmer Roussey | rousse002elm | 1888 | 8/15-9/29 | Elmira | Central League | Elmira, NY | |
| Phil Routcliffe | routcl001phi | 1888 | 4/26-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Phil Routcliffe | routcl001phi | 1888 | 9/1-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Rev. Rowan | 1888 | Lafayette Col. | College | , | |||
| Dave Rowe | rowe--001dav | 1888 | 32 g. | Kansas City | American Association | Kansas City, MO | |
| Dave Rowe | rowe--001dav | 1888 | 7/19-8/6 | 14 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Jack Rowe | rowe--001jac | 1888 | 105 g. | Detroit | National League | Detroit, MI | |
| William Rowe | rowe--003wil | 1888 | Rochester | New England Interstate League | Rochester, NY | ||
| Rowelley | rowell001--- | 1888 | 5/3 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Val Rowins | rowins001val | 1888 | 5/22 | London Tecumsehs | International Association | London, ON | |
| A.B. Royce | royce-001a-- | 1888 | +5/23-5/26+ | Logansport | Indiana State League | Logansport, IN | |
| A. B. Royse | 1888 | Logansport | Indiana State League | Logansport, IN | |||
| Edward Rudderham | rudder001joh | 1888 | Portsmouth | Independent | Portsmouth, NH | ||
| John Rudderham | rudder001joh | 1888 | no g. | Allentown Peanuts | Central League | Allentown, PA | |
| John Rudderham | rudder001joh | 1888 | 5/14-6/12+ | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| John Rudderham | rudder001joh | 1888 | 7/20-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| William Rudolph | rudolp001wil | 1888 | 5/30 | Memphis Grays | Southern League | Memphis, TN | |
| J. Russell | russel003j-- | 1888 | Los Angeles | Independent | Los Angeles, CA | ||
| Doc Rutter | rutter001doc | 1888 | 5/22-? | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Ryan | ryan--045--- | 1888 | 6/30 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Ryan | 1888 | 6/2-6/16 | Oswego | Eastern International League | Oswego, NY | ||
| Cyclone Ryan | ryan--001cyc | 1888 | 4/23-5/2 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Jack Ryan | ryan--021joh | 1888 | 3/30-5/5 | Galveston Giants | Texas League | Galveston, TX | |
| Jack Ryan | ryan--021joh | 1888 | 5/7-5/13? | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Jack Ryan | ryan--021joh | 1888 | 5/11-6/28 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Jack Ryan | ryan--021joh | 1888 | 7/4 | Austin Senators/San Antonio | Texas League | San Antonio, TX | |
| Jack Ryan | ryan--004joh | 1888 | Du Bois | Independent | Du Bois, | ||
| Jack Ryan | ryan--004joh | 1888 | Portsmouth | Independent | Portsmouth, NH | ||
| James Ryan | ryan--012jam | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| James Ryan | ryan--012jam | 1888 | 7/24-9/6 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Jimmy Ryan | ryan--003jam | 1888 | 129 g. | Chicago | National League | Chicago, IL | |
| John Ryan | ryan--020joh | 1888 | 64 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| M. Ryan | ryan--004m-- | 1888 | 4/14-5/8 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| W.? Ryder | 1888 | 5/30-8/14 | Kingston | Eastern International League | Kingston, ON | ||
| C. Ryman | ryman-001c-- | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | ||
| C. Ryman | ryman-001c-- | 1888 | 6/25-9/12 | Easton | Central League | Easton, PA | |
| Dummy Ryn | ryn---001joh | 1888 | 4/26-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Dummy Ryn | ryn---001joh | 1888 | 9/5-9/22 | Lima Lushers | Tri-State League | Lima, OH | |
| Harry Sage | sage--001har | 1888 | 4/28-10/8 | 52 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Ed Sales | sales-001ed- | 1888 | 4/23-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Ben Sanders | sander002ben | 1888 | 6/6- | 57 g. | Philadelphia | National League | Philadelphia, PA |
| Sanford | sanfor016--- | 1888 | 7/10-7/26 | Seneca Falls | Central New York League | Seneca Falls, NY | |
| Sanford | sanfor016--- | 1888 | 7/27 | Penn Yan | Central New York League | Penn Yan, NY | |
| A. W. Saunders | 1888 | 4/8-5/3 | Umpire | So | , | ||
| Al Sauter | sauter001al- | 1888 | Philadelphia Hardware | Independent | Philadelphia, PA | ||
| Al Sauter | sauter001al- | 1888 | 6/20-8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| Savage | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| William Sawhill | sawhil001wil | 1888 | no g. | Mansfield | Tri-State League | Mansfield, OH | |
| William Sawhill | sawhil001wil | 1888 | Lafayette | Indiana State League | Lafayette, IN | ||
| William Sawhill | sawhil001wil | 1888 | +5/9+ | Lafayette | Indiana State League | Lafayette, IN | |
| William Sawhill | sawhil001wil | 1888 | 11 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| William Sawhill | sawhil001wil | 1888 | 7/19-7/20 | Toledo Maumees | Tri-State League | Toledo, OH | |
| George Saxenheimer | saxenh001geo | 1888 | 7/17-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | |
| George Saxenheimer | saxenh001geo | 1888 | 8/13 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| Jimmy Say | say---001jim | 1888 | 4/28-9/29 | Scranton Miners | Central League | Scranton, PA | |
| Lou Say | say---001lou | 1888 | Baltimore Reserves | Independent | Baltimore, MD | ||
| Lou Say | say---001lou | 1888 | Norfolk | S-P | Norfolk, VA | ||
| Sayers | sayers001--- | 1888 | 1 g. | Stockton | California League | Stockton, CA | |
| Sayers | sayers001--- | 1888 | 7 g. | Sacramento | California State League | Sacramento, CA | |
| Sayers | sayers002--- | 1888 | 31 g. | Rockford | Central Interstate League | Rockford, IL | |
| F.B. Sayward | saywar001f-- | 1888 | Rochester | New England Interstate League | Rochester, NY | ||
| Perry Schaffer | schaff001per | 1888 | 23 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| John Schappert | schapp001joh | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | ||
| Gus Scharringhausen | sherin001j-- | 1888 | 4/8-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Gus Scharringhausen | sherin001j-- | 1888 | 7/4-6/25 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Gus Scharringhausen | sherin001j-- | 1888 | 7/14-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Schaub | schaub009--- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| Ted Scheffler | scheff001ted | 1888 | 4/28-8/3 | Manchester Maroons | New England League | Manchester, NH | |
| Ted Scheffler | scheff001ted | 1888 | 8/7- | 27 g. | Detroit | National League | Detroit, MI |
| Frank Scheibeck | scheib001fra | 1888 | 1 g. | Detroit | National League | Detroit, MI | |
| Frank Scheibeck | scheib001fra | 1888 | 5/10-9/15+ | London Tecumsehs | International Association | London, ON | |
| Jack Scheible | scheib001jac | 1888 | Youngstown | Independent | Youngstown, OH | ||
| Matthew Schell | schell001mat | 1888 | 4/26-8/28 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Al Schellhase | schell001al- | 1888 | 5/1-9/19+ | Syracuse Stars | International Association | Syracuse, NY | |
| George Scherer | schere001--- | 1888 | 16 g. | Danville Browns | Central Interstate League | Danville, IL | |
| George Scherer | schere001--- | 1888 | Davenport | Central Interstate League | Davenport, IA | ||
| George Scherer | schere001--- | 1888 | 8/26 | 1 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Luke Schildknecht | schild001luk | 1888 | 6/1 | 1 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Luke Schildknecht | schild001luk | 1888 | 7/4-9/28 | 22 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Jacob Schlehr | schleh001jac | 1888 | 4/30 | Scranton Miners | Central League | Scranton, PA | |
| Bob Schleicher | schlei003rob | 1888 | 5/22-5/29 | Memphis Grays | Southern League | Memphis, TN | |
| W. Schlerman | schler000w-- | 1888 | Frankfort | Indiana State League | Frankfort, IN | ||
| Gus Schmelz | schmel001gus | 1888 | Cincinnati | American Association | Cincinnati, OH | ||
| Schnebly | schneb001--- | 1888 | 1 g. | Peoria Reds | Central Interstate League | Peoria, IL | |
| William Schneider | schnei005wil | 1888 | 28 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Schnorr | schnor001--- | 1888 | 5 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| Jumbo Schoeneck | schoen001jum | 1888 | 5/17-8/12 | 70 g. | Chicago Maroons | Western Association | Chicago, IL |
| Jumbo Schoeneck | schoen001jum | 1888 | 48 g. | Indianapolis | National League | Indianapolis, IN | |
| Schohey | schohe000--- | 1888 | 6/22-7/23 | Belleville | Eastern International League | Belleville, NJ | |
| Otto Schomberg | schomb001ott | 1888 | 30 g. | Indianapolis | National League | Indianapolis, IN | |
| Schoonmaker | schoon002--- | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| H. Schri | 1888 | Logansport | Indiana State League | Logansport, IN | |||
| Frank Schriner | schrin001fra | 1888 | 2 g. | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Pop Schriver | schriv001wil | 1888 | 40 g. | Philadelphia | National League | Philadelphia, PA | |
| H. Schrl | schrl-000h-- | 1888 | Logansport | Indiana State League | Logansport, IN | ||
| William Schwanjack | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Bill Schwartz | schwar001bil | 1888 | 5/1- | 49 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| John Schwartz | schwar004joh | 1888 | 8/12-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| John Schweitzer | schwei001joh | 1888 | 5/19-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Frank Scott | 1888 | Chicago Unions | Independent | Chicago, IL | |||
| Gallatin Scott | scott-001gal | 1888 | 4/8-5/23 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Gallatin Scott | scott-001gal | 1888 | 6/14-6/30 | Dallas Hams | Texas League | Dallas, TX | |
| Gallatin Scott | scott-001gal | 1888 | 7/21-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Milt Scott | scott-001mil | 1888 | 8/13-9/12 | 24 g. | Chicago Maroons | Western Association | Chicago, IL |
| Sears | sears-004--- | 1888 | 4/10 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Newton Sears | sears-001new | 1888 | 5/19 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Fred Seering | seerin001fre | 1888 | 5/2-9/18+ | Troy Trojans | International Association | Troy, NY | |
| Emmett Seery | seery-001emm | 1888 | 133 g. | Indianapolis | National League | Indianapolis, IN | |
| Seibal | seibal001--- | 1888 | +5/19- | Lincoln Tree Planters | Western League | Lincoln, NE | |
| William Selden | seldon001wil | 1888 | Cuban Giants | Independent | Cuban, | ||
| Frank Selee | selee-001fra | 1888 | 4/28-10/9 | Omaha Omahogs/Lambs | Western Association | Omaha, NE | |
| J. W. Sell | 1888 | 5/5-6/16 | Camden | PhilReg | Camden, NJ | ||
| J. W. Sell | 1888 | Burlington | Independent | Burlington, NJ | |||
| Seller | 1888 | 7/7-7/18 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Charles Selna | selna-001cha | 1888 | Stockton | California League | Stockton, CA | ||
| Senang | senang001--- | 1888 | 6/21 | Binghamton Crickets | Central League | Binghamton, NY | |
| Billy Serad | serad-001bil | 1888 | Chester | Independent | Chester, PA | ||
| Billy Serad | serad-001bil | 1888 | -7/7 | 6 g. | Cincinnati | American Association | Cincinnati, OH |
| Billy Serad | serad-001bil | 1888 | 8/22-9/4 | Syracuse Stars | International Association | Syracuse, NY | |
| Seruby | 1888 | Cuban Giants | Independent | Cuban, | |||
| John Serverson | server001joh | 1888 | 5/19-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Ed Seward | seward001ed- | 1888 | 64 g. | Philadelphia | American Association | Philadelphia, PA | |
| Orator Shafer | shafer001ora | 1888 | 4/28-10/9 | 111 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Taylor Shafer | shafer001tay | 1888 | 4/28-8/2 | 62 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Taylor Shafer | shafer001tay | 1888 | 8/17-8/18 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| John Shaffer | shaffe001joh | 1888 | 4/8-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| John Shaffer | shaffe001joh | 1888 | 7/15-8/9 | 7 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Dan Shannon | shanno004dan | 1888 | 4/30-7/20 | 39 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Dan Shannon | shanno004dan | 1888 | 9/15-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Joseph Shannon | shanno003jos | 1888 | 7/6-7/26 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| George Sharp | sharp-001geo | 1888 | St. Thomas | Amat | St. Thomas, ON | ||
| Peck Sharp | sharp-001jim | 1888 | 25 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Joseph Sharpe | sharpe001jos | 1888 | 107 g. | Canton Nadjys | Tri-State League | Canton, OH | |
| E.? Sharpless | 1888 | 7/4 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Edward Sharpless | 1888 | 5/5-8/7 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Bill Sharsig | sharsi001bil | 1888 | g. | Philadelphia | American Association | Philadelphia, PA | |
| Alvin Shaw | 1888 | Cumberland | Independent | Cumberland, MD | |||
| Dupee Shaw | shaw--001dup | 1888 | 5/5-5/21 | Portland | New England League | Portland, ME | |
| Dupee Shaw | shaw--001dup | 1888 | -7/17 | 3 g. | Washington | National League | Washington, DC |
| Dupee Shaw | shaw--001dup | 1888 | 7/28-7/30 | Houston Babies | Texas-Southern League | Houston, TX | |
| John Shaw | shaw--008joh | 1888 | 4/30-5/1 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| John Shaw | shaw--008joh | 1888 | 8/10-8/23 | Easton | Central League | Easton, PA | |
| John Shaw | shaw--008joh | 1888 | 5/22-7/1 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| John Shaw | shaw--008joh | 1888 | 7/11-7/16 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| John Shaw | shaw--008joh | 1888 | 7/28-7/30 | Houston Babies | Texas-Southern League | Houston, TX | |
| Sam Shaw | shaw--002sam | 1888 | 5/3- | 6 g. | Baltimore | American Association | Baltimore, MD |
| Sam Shaw | shaw--002sam | 1888 | 8/11 | Worcester Grays | New England League | Worcester, MA | |
| Shay | shay--007--- | 1888 | 6/5-9/29 | Elmira | Central League | Elmira, NY | |
| Eli Shay | shay--001edw | 1888 | 4/28-6/26 | Binghamton Crickets | Central League | Binghamton, NY | |
| Joseph Shea | shea--001jos | 1888 | 3/29- | 67 g. | Oakland Greenhood & Morans | California League | Oakland, CA |
| Mike Shea | shea--001mik | 1888 | 3/30-6/21 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Mike Shea | shea--001mik | 1888 | 7/29-8/3 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Mike Shea | shea--001mik | 1888 | 8/5 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Shear | 1888 | 2 g. | Waterloo | Central New York League | Waterloo, NY | ||
| John Shearon | shearo002joh | 1888 | no g. | Lima Lushers | Tri-State League | Lima, OH | |
| John Shearon | shearo002joh | 1888 | 6/13-9/29 | Elmira | Central League | Elmira, NY | |
| Sheedy | sheedy000--- | 1888 | +6/19-6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| James Sheehan | sheeha003jam | 1888 | 30 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| James Sheehan | sheeha003jam | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Patrick Sheehan | sheeha001pat | 1888 | 4/28-8/3 | Worcester Grays | New England League | Worcester, MA | |
| Matthew Shell | shell-001mat | 1888 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | ||
| William Shenkel | shenke001wil | 1888 | 4/28-10/7 | 39 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Shepard | shepar005--- | 1888 | 2 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Alfred Sheppard/erd | sheppa001alf | 1888 | 4/30-9/14+ | Toronto Canucks | International Association | Toronto, ON | |
| Jack Sheridan | sherid001jac | 1888 | 3/29- | Umpire | Calif | , | |
| Jimmy Sherlock | sherlo001jim | 1888 | no g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Sherman | sherma001--- | 1888 | Troy Trojans | International Association | Troy, NY | ||
| Shill | 1888 | Burlington | Independent | Burlington, NJ | |||
| Billy Shindle | shindl001wil | 1888 | 135 g. | Baltimore | American Association | Baltimore, MD | |
| Tim Shinnick | shinni002tim | 1888 | Phil. Exeter Col. | College | , | ||
| Tim Shinnick | shinni002tim | 1888 | 5/1-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| Shoaff | 1888 | 5/3-5/14 | Umpire | CIntSt | , | ||
| George Shoch | shoch-001geo | 1888 | 90 g. | Washington | National League | Washington, DC | |
| James Shores | shores001jam | 1888 | 5 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| James Shores | shores001jam | 1888 | Albuquerque | NM | Albuquerque, NM | ||
| John Shoup | shoupe001joh | 1888 | 4/28-5/17 | Manchester Maroons | New England League | Manchester, NH | |
| John Shoup | shoupe001joh | 1888 | 6/6-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| A. F. Shreeve | 1888 | Logansport | Indiana State League | Logansport, IN | |||
| Lev Shreve | shreve001lev | 1888 | 36 g. | Indianapolis | National League | Indianapolis, IN | |
| Frank Shugart | shugar001fra | 1888 | 4/28-9/29 | Elmira | Central League | Elmira, NY | |
| John Shutt | shutt-001joh | 1888 | 5/19-7/4 | Ashland | Central Pennsylvania League | Ashland, PA | |
| John Shutt | shutt-001joh | 1888 | 7/17-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Henry Siebel | siebel001hen | 1888 | 5/4-7/3 | Charleston Seagulls | Southern League | Charleston, SC | |
| Henry Siebel | siebel001hen | 1888 | 7/22-9/30 | 17 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Ed Silch | silch-001ed- | 1888 | -7/8 | 14 g. | Brooklyn | American Association | Brooklyn, NY |
| Ed Silch | silch-001ed- | 1888 | 7/12-7/24 | Buffalo Bisons | International Association | Buffalo, NY | |
| Simmons | simmon030--- | 1888 | 5/29 | Allentown Peanuts | Central League | Allentown, PA | |
| Joe Simmons | simmon001joe | 1888 | 5/19-8/14 | Umpire | TriSt | , | |
| Hank Simon | simon-001hen | 1888 | 4/28-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Simpson | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Simpson | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Ed Sixsmith | sixsmi001ed- | 1888 | 4/14-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Ed Sixsmith | sixsmi001ed- | 1888 | 6/18-9/9 | Canton Nadjys | Tri-State League | Canton, OH | |
| Mike Slattery | slatte001mik | 1888 | -7/23 | 103 g. | New York | National League | New York, NY |
| Frank Small | small-002fra | 1888 | Maine St. College | College | , | ||
| Frank Small | small-002fra | 1888 | 5 g. | Davenport | Central Interstate League | Davenport, IA | |
| Frank Small | small-002fra | 1888 | 8/8-8/9 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Smalley | 1888 | 1 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Smalley | 1888 | 1 g. | Canandaigua | Central New York League | Canandaigua, NY | ||
| Will Smalley | smalle001wil | 1888 | 33 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| Will Smalley | smalle001wil | 1888 | 12 g. | San Francisco Haverlys | California League | San Francisco, CA | |
| Will Smalley | smalle001wil | 1888 | 4 g. | Oakland Tribunes | California State League | Oakland, CA | |
| George Smedley | 1888 | 5/9-6/2 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Philip Smedley | 1888 | 5/5-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Smith | smith-007--- | 1888 | 5/23-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Smith | 1888 | 28 g. | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Smith | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Smith | 1888 | Burlington | Independent | Burlington, NJ | |||
| Smith | 1888 | 7/11 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Smith | smith-008--- | 1888 | Philadelphia Solar Tips | Independent | Philadelphia, PA | ||
| Andy Smith | smith-008and | 1888 | NMSt | , | |||
| Billy Smith | schmid001bil | 1888 | 4/7-5/23 | Memphis Grays | Southern League | Memphis, TN | |
| Billy Smith | smith-061wil | 1888 | 5/27-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Billy Smith | smith-061wil | 1888 | 7/10-7/22 | Houston Babies | Texas-Southern League | Houston, TX | |
| Billy Smith | smith-061wil | 1888 | 8/26 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Carlos Smith | smith-011w-- | 1888 | Elmira | Central League | Elmira, NY | ||
| E. Smith | 1888 | +6/25+ | Waterbury | Connecticut State League | Waterbury, CT | ||
| Elmer Smith | smith-004elm | 1888 | 40 g. | Cincinnati | American Association | Cincinnati, OH | |
| Emil Smith | smith-001emi | 1888 | Watertown | Eastern International League | Watertown, NY | ||
| Ernest Smith | smith-003ern | 1888 | 4/25-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| F. Smith | 1888 | 7/11-7/18 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Frank Smith | smith-014fra | 1888 | +6/12-8/4+ | Watertown | Eastern International League | Watertown, NY | |
| Frank Smith | smith-014fra | 1888 | 18 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| Fred Smith | smith-016fre | 1888 | 5/4-10/9 | 30 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| G. Smith | 1888 | 5/9-8/13 | Chester Houston | PhilReg | Chester, PA | ||
| G.A. Smith | smith-012g-- | 1888 | Meriden | Connecticut State League | Meridan, CT | ||
| Germany Smith | smith-013geo | 1888 | 103 g. | Brooklyn | American Association | Brooklyn, NY | |
| Harry Smith | smith-019har | 1888 | Albuquerque | NMSt | Albuquerque, NM | ||
| Harry Smith | smith-019har | 1888 | Las Cruces | NMSt | Las Cruces, | ||
| Harry Smith | smith-024har | 1888 | 3/30-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| Harry Smith | smith-024har | 1888 | 7/11-8/11 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Harry Smith | smith-028har | 1888 | 4/22-5/15 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Hugh Smith | smith-004hug | 1888 | 3/29- | 60 g. | San Francisco Pioneers | California League | San Francisco, CA |
| John Smith | smith-043joh | 1888 | 3/29- | 67 g. | San Francisco Pioneers | California League | San Francisco, CA |
| John Smith | smith-052joh | 1888 | 4/28-5/17 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Joseph Smith | 1888 | 6/20 | Camden | PhilReg | Camden, NJ | ||
| Jud Smith | smith-001jud | 1888 | Ohio State U. | College | , | ||
| Jud Smith | smith-001jud | 1888 | Aberdeen | Independent | Aberdeen, SD | ||
| Leo Smith | smith-007leo | 1888 | 4/28-9/29 | Newark Trunkmakers | Central League | Newark, NJ | |
| Nicholas Smith | smith-002nic | 1888 | 3/29- | 60 g. | San Francisco Pioneers | California League | San Francisco, CA |
| Ollie Smith | smith-002oll | 1888 | Houston | Houston, TX | |||
| Pacer Smith | smith-041cha | 1888 | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | ||
| Pacer Smith | smith-041cha | 1888 | 5/5-6/ | Decatur | Central Interstate League | Decatur, IL | |
| Pacer Smith | smith-041cha | 1888 | 33 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Pacer Smith | smith-041cha | 1888 | Decatur Reds | Independent | Decatur, IL | ||
| Phenomenal Smith | smith-013joh | 1888 | 35 g. | Baltimore | American Association | Baltimore, MD | |
| Phenomenal Smith | smith-013joh | 1888 | 3 g. | Philadelphia | American Association | Philadelphia, PA | |
| Pop Smith | smith-001pop | 1888 | 131 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Rex Smith | smith-002rex | 1888 | , | ||||
| Silas Smith | smith-001sil | 1888 | 5/24 | Toronto Canucks | International Association | Toronto, ON | |
| Silas Smith | smith-001sil | 1888 | +6/4-7/30 | Belleville | Eastern International League | Belleville, NJ | |
| Skyrocket Smith | smith-001sky | 1888 | 4/18-7/8 | 58 g. | Louisville | American Association | Louisville, KY |
| John Sneed | sneed-002joh | 1888 | 4/7-6/12 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| John Sneed | sneed-002joh | 1888 | 7/4-10/1 | 73 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Snell | snell-002--- | 1888 | 8/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| Snow | snow--008--- | 1888 | 7/16-8/16 | Easton | Central League | Easton, PA | |
| Snyder | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Snyder | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Snyder | snyder063--- | 1888 | +8/2+ | South Bend | Indiana State League | South Bend, IN | |
| Arthur Snyder | snyder001a-- | 1888 | 50 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Arthur Snyder | snyder001a-- | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Arthur Snyder | snyder001a-- | 1888 | 8/26-9/14 | 13 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Benjamin Snyder | snyder003ben | 1888 | 30 g. | Rockford | Central Interstate League | Rockford, IL | |
| Benjamin Snyder | snyder003ben | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Pop Snyder | snyder001pop | 1888 | 64 g. | Cleveland | American Association | Cleveland, OH | |
| Joe Sommer | sommer001joe | 1888 | 79 g. | Baltimore | American Association | Baltimore, MD | |
| Andy Sommers | sommer001pet | 1888 | 4/23-9/16 | Lima Lushers | Tri-State League | Lima, OH | |
| Andy Sommers | sommer001pet | 1888 | 4 g. | Boston | National League | Boston, MA | |
| Pete Sommers | sommer002pet | 1888 | preseason | St. Louis Browns | American Association | St. Louis, MO | |
| Pete Sommers | sommer002pet | 1888 | Spring training | St. Louis Whites | Western Association | St. Louis, MO | |
| Pete Sommers | sommer002pet | 1888 | 5/11-7/25 | Mansfield | Tri-State League | Mansfield, OH | |
| Pete Sommers | sommer002pet | 1888 | 8/3-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| William Soper | soper-001wil | 1888 | 5/19-6/16 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| William Soper | soper-001wil | 1888 | 7/18-8/1 | Philadelphia Somerset | PhilReg | Philadelphia, PA | |
| Bill Sowders | sowder001bil | 1888 | 4/24- | 36 g. | Boston | National League | Boston, MA |
| Dave Sowders | sowder001dav | 1888 | 4/24-9/20 | Lima Lushers | Tri-State League | Lima, OH | |
| John Sowders | sowder001joh | 1888 | 4/28-7/8 | 17 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| John Sowders | sowder001joh | 1888 | 7/17-8/3 | 7 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| John Sowders | sowder001joh | 1888 | 8/8-10/4 | 21 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Len Sowders | sowder001len | 1888 | 5/1-5/26 | 10 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| Len Sowders | sowder001len | 1888 | 6/7-9/15+ | London Tecumsehs | International Association | London, ON | |
| Sowers | 1888 | 7/4 | Philadelphia Frankford | PhilReg | Philadelphia, PA | ||
| Bernard Speidel | speide001ber | 1888 | 5/4-7/6 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Bernard Speidel | speide001ber | 1888 | 8/10-8/18 | Mansfield | Tri-State League | Mansfield, OH | |
| Harry Spence | spence001har | 1888 | 4/20-10/13 | g. | Indianapolis | National League | Indianapolis, IN |
| Spencer | 1888 | 6 g. | Oakland Clevelands | California State League | Oakland, CA | ||
| Frank Spill | spill-001fra | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Frank Spill | spill-001fra | 1888 | 8/18-9/29 | Easton | Central League | Easton, PA | |
| Spooner | 1888 | 5/26-8/2 | Norristown | PhilReg | Norristown, PA | ||
| Charlie Sprague | spragu001cha | 1888 | 5/6-10/7 | 62 g. | Chicago Maroons | Western Association | Chicago, IL |
| Ed Springer | spring001ed- | 1888 | preseason | Detroit | National League | Detroit, MI | |
| Ed Springer | spring001ed- | 1888 | 5/3-5/7 | Dallas Hams | Texas League | Dallas, TX | |
| J.M. Springer | spring002j-- | 1888 | 4/28-5/1 | Scranton Miners | Central League | Scranton, PA | |
| Ed Sproat | sproat001ed- | 1888 | 5/1-5/7 | 3 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Stadder | stadde000--- | 1888 | +6/19-6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| James Stafford | staffo001gen | 1888 | 5/2-9/6 | Worcester Grays | New England League | Worcester, MA | |
| Amos Stagg | 1888 | New Jersey | Independent | New Jersey, NJ | |||
| John Staib | staib-001joh | 1888 | 4/30-7/20 | Manchester Maroons | New England League | Manchester, NH | |
| John Staib | staib-001joh | 1888 | 9/6-9/29 | Allentown Peanuts | Central League | Allentown, PA | |
| Staley | staley002--- | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | ||
| Harry Staley | staley001har | 1888 | 4/28-6/19 | 23 g. | St. Louis Whites | Western Association | St. Louis, MO |
| Harry Staley | staley001har | 1888 | 6/23- | 25 g. | Pittsburgh | National League | Pittsburgh, PA |
| George Stallings | stalli002geo | 1888 | 4/1-7/9 | Galveston Giants | Texas League | Galveston, TX | |
| George Stallings | stalli002geo | 1888 | 7/12-8/14 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| George Stallings | stalli002geo | 1888 | 24 g. | Stockton | California League | Stockton, CA | |
| Thomas Stallings | stalli001tho | 1888 | 4/14-5/15 | Galveston Giants | Texas League | Galveston, TX | |
| George Stalze | stalze001geo | 1888 | 4/28-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| John Stalze | stalze001joh | 1888 | 6/28-7/5 | Worcester Grays | New England League | Worcester, MA | |
| Adam Stanhope | stanho001ada | 1888 | 5/3-5/5 | Albany Governors | International Association | Albany, NY | |
| Matt Stanley | stanle001mat | 1888 | 2 g. | San Francisco | California State League | San Francisco, CA | |
| M. Stanton | 1888 | U. of Pennsylvania | College | , | |||
| M. Stanton | 1888 | Cape May | Independent | Cape May, NJ | |||
| Staples | staple007--- | 1888 | South Bend | Independent | South Bend, IN | ||
| Staples | staple007--- | 1888 | +7/4-8/2+ | South Bend | Indiana State League | South Bend, IN | |
| Edward Stapleton | staple002edw | 1888 | 4/26-8/9 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Edward Stapleton | staple002edw | 1888 | 44 g. | Rockford | Central Interstate League | Rockford, IL | |
| Edward Stapleton | staple002edw | 1888 | Bloomington Reds | Central Interstate League | Bloomington, IL | ||
| Frank Stapleton | staple003fra | 1888 | +5/24-7/27+ | Logansport | Indiana State League | Logansport, IN | |
| Alfred Stearns | 1888 | North Andover | North Andover, MA | ||||
| Dan Stearns | stearn002dan | 1888 | 4/28-10/9 | 95 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| William Stecher | steche001wil | 1888 | +5/9- | Philadelphia Riverton | Independent | Philadelphia, PA | |
| William Stecher | steche001wil | 1888 | Burlington | Independent | Burlington, NJ | ||
| Steele | steele018--- | 1888 | 8/6-8/16 | Easton | Central League | Easton, PA | |
| Fred Stein | stein-001fre | 1888 | 3 g. | Stockton | California League | Stockton, CA | |
| Fred Stein | stein-001fre | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| Steinecker | 1888 | Burlington | Independent | Burlington, NJ | |||
| Simmons Steiner | steine001sim | 1888 | Brooklyn Atlantics | Independent | Brooklyn, NY | ||
| Simmons Steiner | steine001sim | 1888 | 4/28-8/9 | Newark Trunkmakers | Central League | Newark, NJ | |
| Bill Stellberger | stellb001bil | 1888 | 4/23-8/9 | Umpire | TriSt | , | |
| Bill Stemmyer | stemme001bil | 1888 | 3 g. | Cleveland | American Association | Cleveland, OH | |
| Jake Stenzel | stenze001jak | 1888 | 4/26-9/21 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Ben Stephens | stephe001ben | 1888 | 5/22-8/14 | 23 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Ben Stephens | stephe001ben | 1888 | 8/25-9/30 | 11 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Benjamin Stephens | stephe002ben | 1888 | 4/26-6/8 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| John Sterling | sterli002joh | 1888 | 5/23 | Ashland | Central Pennsylvania League | Ashland, PA | |
| John Sterling | sterli002joh | 1888 | St. Louis Browns | American Association | St. Louis, MO | ||
| Robert Sterling | sterli003rob | 1888 | 5/19-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Fred Stevens | 1888 | 8 g. | Auburn Yankees | Central New York League | Auburn, NY | ||
| Neal/Neil Stevens | 1888 | 5/5-8/13 | Chester Houston | PhilReg | Chester, PA | ||
| W.A. Stevens | steven002w-- | 1888 | 11 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Stevenson | 1888 | 5/5-6/6 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Stevenson | 1888 | 6/20-8/1 | Philadelphia Norristown | PhilReg | Philadelphia, PA | ||
| Stickney | stickn002--- | 1888 | Danbury | Connecticut State League | Danbury, CT | ||
| Dick Stickney | stickn001d-- | 1888 | 6/5-6/7 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Dick Stickney | stickn001d-- | 1888 | 8/25 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Robert Stickney | stickn001rob | 1888 | no g. | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Will Stickney | stickn001wil | 1888 | 4/23-8/31 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Will Stickney | stickn001--- | 1888 | 7/20-7/21 | Mansfield | Tri-State League | Mansfield, OH | |
| Harry Stine | stine-001har | 1888 | 4/30-6/9 | Portland | New England League | Portland, ME | |
| Harry Stine | stine-001har | 1888 | 6/13 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Harry Stine | stine-001har | 1888 | 6/14-8/11 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| James Stirling | sterli004--- | 1888 | 5/26-6/4 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| James Stirling | sterli004--- | 1888 | Spring training | Minneapolis Millers | Western Association | Minneapolis, MN | |
| Jack Stivetts | stivet001jac | 1888 | 5/19-8/10 | Ashland | Central Pennsylvania League | Ashland, PA | |
| Jack Stivetts | stivet001jac | 1888 | 8/17-9/5 | Allentown Peanuts | Central League | Allentown, PA | |
| William Stockamp | stocka001wil | 1888 | Lincoln Tree Planters | Western League | Lincoln, NE | ||
| William Stockamp | stocka001wil | 1888 | Leavenworth Soldiers | Western League | Leavenworth, KS | ||
| Len Stockwell | stockw001len | 1888 | 3/29- | 66 g. | Stockton | California League | Stockton, CA |
| Stone | stone-012--- | 1888 | 4/28-5/10 | Easton | Central League | Easton, PA | |
| George Stone | stone-005geo | 1888 | 6/8-7/4 | Oswego | Eastern International League | Oswego, NY | |
| George Stone | stone-005geo | 1888 | +7/20-8/6 | Watertown | Eastern International League | Watertown, NY | |
| Charles Stouche | 1888 | InSt | , | ||||
| George Stovey | stovey001geo | 1888 | -6/6 | Cuban Giants | Independent | Cuban, | |
| George Stovey | stovey001geo | 1888 | 6/9-7/11 | Worcester Grays | New England League | Worcester, MA | |
| George Stovey | stovey001geo | 1888 | Cuban Giants | Independent | Cuban, | ||
| Harry Stovey | stovey001har | 1888 | 130 g. | Philadelphia | American Association | Philadelphia, PA | |
| Strassheim | 1888 | 5/12-7/14 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Scott Stratton | stratt001sco | 1888 | 4/21- | 67 g. | Louisville | American Association | Louisville, KY |
| Joe Straub | straub001joe | 1888 | Denver Solis | Independent | Denver, CO | ||
| Joe Straub | straub001joe | 1888 | 5/10- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Joe Strauss | straus001joe | 1888 | 4/28-10/7 | 126 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Harry Strebeigh | 1888 | Columbia Univ | College | , | |||
| Stref | stref-001--- | 1888 | 1 g. | Mansfield | Tri-State League | Mansfield, OH | |
| Cub Stricker | strick001cub | 1888 | 127 g. | Cleveland | American Association | Cleveland, OH | |
| D. H. Strickland | 1888 | 5/5-8/4 | Norristown | PhilReg | Norristown, PA | ||
| Strieberg | 1888 | Staten Island | Independent | Staten Island, NY | |||
| George Strief | strief001geo | 1888 | 4/7-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| George Strief | strief001geo | 1888 | 7/29-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| George Strief | strief001geo | 1888 | 8/18 | Mansfield | Tri-State League | Mansfield, OH | |
| John Strike | strike001joh | 1888 | 5/5-8/4 | Chester Houston | PhilReg | Chester, PA | |
| A. Strittmaier | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Chas. Strittmaier | stritt000c-- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| Con Strothers | stroth001joh | 1888 | 4/27-6/4 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Con Strothers | stroth001joh | 1888 | 6/18-9/19 | Toledo Maumees | Tri-State League | Toledo, OH | |
| John Struck | struck001--- | 1888 | 5/7-5/22 | Umpire | West | , | |
| John Struck | struck001joh | 1888 | 5/24-6/10 | 4 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Al Strueve | struev001al- | 1888 | 4/23-4/26 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Al Strueve | struev001al- | 1888 | +5/24-5/27+ | Logansport | Indiana State League | Logansport, IN | |
| Al Strueve | struev001al- | 1888 | 6/11-6/29 | Buffalo Bisons | International Association | Buffalo, NY | |
| John Strunz | strunz001joh | 1888 | 21 g. | Oakland Greenhood & Morans | California League | Oakland, CA | |
| W.V. Strunz | strunz001w-- | 1888 | +5/12- | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| Arthur Stuart | stuart001art | 1888 | 4/28-9/18+ | Troy Trojans | International Association | Troy, NY | |
| George Stultz | stultz002geo | 1888 | 6 g. | Oakland Clevelands | California State League | Oakland, CA | |
| Henry Stultz | stultz001hen | 1888 | 5 g. | Oakland Tribunes | California State League | Oakland, CA | |
| William Stultz | stultz001wil | 1888 | 7 g. | Oakland Clevelands | California State League | Oakland, CA | |
| E.L. Stump | stump-000el- | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| Tony Suck | suck--001ton | 1888 | 5/5-7/3 | Umpire | So | , | |
| Sullivan | sulliv009--- | 1888 | 5/5-5/27 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Sullivan | sulliv021--- | 1888 | 5/15 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Sullivan | 1888 | 8/11 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Sullivan | 1888 | 6/12 | Watertown | Eastern International League | Watertown, NY | ||
| Sullivan | sulliv031--- | 1888 | Albany Governors | International Association | Albany, NY | ||
| B.F. Sullivan | sulliv000bf- | 1888 | Marion | Indiana State League | Marion, IN | ||
| B.F. Sullivan | sulliv000bf- | 1888 | 7/21-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Benjamin Sullivan | sulliv003ben | 1888 | 3/30 | Galveston Giants | Texas League | Galveston, TX | |
| Bill Sullivan | sulliv002bil | 1888 | 5/11-9/5 | Lowell Chippies | New England League | Lowell, MA | |
| Charlie Sullivan | sulliv003cha | 1888 | 1 g. | San Francisco | California State League | San Francisco, CA | |
| Dave Sullivan | sulliv006dav | 1888 | 3 g. | MLB Umpire | National League | , | |
| Dave Sullivan | sulliv006dav | 1888 | 5/29..8/13-8/20 | Umpire | NE | , | |
| Jeremiah Sullivan | 1888 | 4/28-8/6 | Umpire | Int | , | ||
| Joseph Sullivan | sulliv009jos | 1888 | 4/28-9/28 | Newark Trunkmakers | Central League | Newark, NJ | |
| Marty Sullivan | sulliv003mar | 1888 | 75 g. | Chicago | National League | Chicago, IL | |
| Mike Sullivan | sulliv001mik | 1888 | 4/26-6/20 | 28 g. | Philadelphia | American Association | Philadelphia, PA |
| Mike Sullivan | sulliv001mik | 1888 | 9/3-9/7 | Syracuse Stars | International Association | Syracuse, NY | |
| Mike Sullivan | sulliv002mik | 1888 | Holyoke | Independent | Holyoke, MA | ||
| T.J. Sullivan | sulliv002t-- | 1888 | Norwalk | Connecticut State League | Norwalk, CT | ||
| Ted Sullivan | sulliv001tp- | 1888 | 4/28-6/ | Troy Trojans | International Association | Troy, NY | |
| Ted Sullivan | sulliv001tp- | 1888 | 6/11-10/13 | g. | Washington | National League | Washington, DC |
| Tom Sullivan | sulliv001tom | 1888 | 4/7-6/30 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Tom Sullivan | sulliv001tom | 1888 | 28 g. | Kansas City | American Association | Kansas City, MO | |
| William Sullivan | sulliv009wil | 1888 | 5/8-9/29 | Easton | Central League | Easton, PA | |
| Kid Summers | summer001kid | 1888 | +6/2-8/14 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Art Sunday | sunday001art | 1888 | 4/15-7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Art Sunday | sunday001art | 1888 | 7/11-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Billy Sunday | sunday001bil | 1888 | 120 g. | Pittsburgh | National League | Pittsburgh, PA | |
| Elmer Sutcliffe | sutcli001sy- | 1888 | 49 g. | Detroit | National League | Detroit, MI | |
| John Sutter | sutter002joh | 1888 | HudRiver | , | |||
| John Sutter | sutter002joh | 1888 | 5/29-6/9 | Portland | New England League | Portland, ME | |
| Ezra Sutton | sutton001ezr | 1888 | 28 g. | Boston | National League | Boston, MA | |
| Ezra Sutton | sutton001ezr | 1888 | 7/10-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Ed Swartwood | swartw001ed- | 1888 | 5/3-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| Park Swartzel | swartz001par | 1888 | 5/2-10/8 | 45 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Sweeney | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Charlie Sweeney | sweene004cha | 1888 | 3/29- | 67 g. | Stockton | California League | Stockton, CA |
| Dan Sweeney | sweene001dan | 1888 | 5/19-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Dan Sweeney | sweene001dan | 1888 | 8/25-9/3 | Hazleton Pugilists | Central League | Hazleton, PA | |
| James Sweeney | sweene008jam | 1888 | 26 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| James Sweeney | sweene008jam | 1888 | Terre Haute Hoosiers | Central Interstate League | Terre Haute, IN | ||
| Pete Sweeney | sweene001pet | 1888 | 4/28-9/18+ | Troy Trojans | International Association | Troy, NY | |
| Pete Sweeney | sweene001pet | 1888 | 9/28- | 11 g. | Washington | National League | Washington, DC |
| Rooney Sweeney | sweene001roo | 1888 | 5/7-5/19 | Manchester Maroons | New England League | Manchester, NH | |
| Rooney Sweeney | sweene001roo | 1888 | San Francisco | San Francisco, CA | |||
| William Sweeney | sweene004wil | 1888 | 4/24-9/1 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| Pop Swett | swett-001pop | 1888 | 4/7- | 31 g. | San Francisco Haverlys | California League | San Francisco, CA |
| Albert Swift | swift-001alb | 1888 | 4/23-9/6 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Albert Swift | swift-001alb | 1888 | 9/16-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Mart Swift | swift-002mar | 1888 | 7/27-9/27 | Scranton Miners | Central League | Scranton, PA | |
| William Sworback | sworba000--- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| William Sworback | sworba000--- | 1888 | Stamford | Connecticut State League | Stamford, CT | ||
| Lou Sylvester | sylves002lou | 1888 | Lincoln Tree Planters | Western League | Lincoln, NE | ||
| Lou Sylvester | sylves002lou | 1888 | Troy Trojans | International Association | Troy, NY | ||
| Synnamon | synnam001--- | 1888 | 6/2-6/20 | Easton | Central League | Easton, PA | |
| Charles Tacleton | taclet000cha | 1888 | Lafayette | Indiana State League | Lafayette, IN | ||
| Taley | taley-001--- | 1888 | 5/22 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Tanner | tanner002--- | 1888 | 9/2 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Edward Tate | tate--001pop | 1888 | 41 g. | Boston | National League | Boston, MA | |
| Tayler | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Taylor | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Billy Taylor | taylor001bil | 1888 | 5/22-9/4 | Scranton Miners | Central League | Scranton, PA | |
| Harry Taylor | taylor006har | 1888 | 6/9-9/10 | Elmira | Central League | Elmira, NY | |
| Live Oak Taylor | taylor001liv | 1888 | , | ||||
| T. W. Taylor | 1888 | 5/5-6/20 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| W.H. Taylor | taylor000wh- | 1888 | +5/23-7/27+ | Logansport | Indiana State League | Logansport, IN | |
| Wally Taylor | taylor000wh- | 1888 | Logansport | Indiana State League | Logansport, IN | ||
| Walter Taylor | 1888 | Umpire | Cent | , | |||
| Al Tebeau | tebeau002al- | 1888 | 14 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Al Tebeau | tebeau002al- | 1888 | Albuquerque | NMSt | Albuquerque, NM | ||
| George Tebeau | tebeau002geo | 1888 | 121 g. | Cincinnati | American Association | Cincinnati, OH | |
| Patsy Tebeau | tebeau001pat | 1888 | 6/2-8/14 | 43 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Patsy Tebeau | tebeau001pat | 1888 | 8/15-10/7 | 47 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| R. Ellsworth Tees | 1888 | Philadelphia Kensington | Independent | Philadelphia, PA | |||
| R. Ellsworth Tees | 1888 | 7/17-7/23 | Philadelphia Kensington | PhilReg | Philadelphia, PA | ||
| John Tener | tener-002joh | 1888 | -7/2 | 12 g. | Chicago | National League | Chicago, IL |
| Tennant | tennan005--- | 1888 | 6/7-6/27 | Binghamton Crickets | Central League | Binghamton, NY | |
| Edmund Terrien | terrie001edm | 1888 | 4/28-7/25 | Lynn Shoemakers | New England League | Lynn, MA | |
| Edmund Terrien | terrie001edm | 1888 | 7/31-9/7 | Worcester Grays | New England League | Worcester, MA | |
| Adonis Terry | terry-001ado | 1888 | 30 g. | Brooklyn | American Association | Brooklyn, NY | |
| Edward Thayer | thayer001edw | 1888 | 5/3-6/1 | Toronto Canucks | International Association | Toronto, ON | |
| Edward Thayer | thayer001edw | 1888 | 6/13-9/15+ | Hamilton Hams | International Association | Hamilton, ON | |
| Arthur Thomas | thomas005art | 1888 | Cuban Giants | Independent | Cuban, | ||
| Harry Thomas | thomas007har | 1888 | +5/9-8/2+ | Elkhart | Indiana State League | Elkhart, IN | |
| Harry Thomas | thomas007har | 1888 | Canandaigua | Central New York League | Canandaigua, NY | ||
| Harry Thomas | thomas007har | 1888 | Elkhart | Indiana State League | Elkhart, IN | ||
| Harry Thomas | thomas007har | 1888 | 8/24-9/14 | Canandaigua | Central New York League | Canandaigua, NY | |
| Andrew Thompson | thomps007and | 1888 | 4/28-10/9 | St. Paul Apostles | Western Association | St. Paul, MN | |
| E. Thompson | 1888 | Burlington | Independent | Burlington, NJ | |||
| F. Thompson | 1888 | 1 g. | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| J. Thompson | 1888 | 5 g. | San Francisco Emersons | California State League | San Francisco, CA | ||
| John Thompson | 1888 | 5/5-6/9 | West Chester Brandywine | PhilReg | West Chester, PA | ||
| Sam Thompson | thomps002sam | 1888 | 56 g. | Detroit | National League | Detroit, MI | |
| Tug Thompson | thomps001tug | 1888 | 6/29-7/2 | Rochester Jingoes | International Association | Rochester, NY | |
| William Thursby | 1888 | no g. | Lafayette | Central Interstate League | Lafayette, IN | ||
| James Thyne | thyne-001jam | 1888 | no g. | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| John Ticknor | tickne001--- | 1888 | Helena | Independent | Helena, MT | ||
| John Tiernan | tierna001joh | 1888 | 5/23-5/26 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Mike Tiernan | tierna001mik | 1888 | 113 g. | New York | National League | New York, NY | |
| Fred Tilden | 1888 | 6/17 | 1 g. | St. Louis Whites | Western Association | St. Louis, MO | |
| Tillson | tillso002--- | 1888 | 2 g. | Stockton | California League | Stockton, CA | |
| Tillson | tillso002--- | 1888 | 1 g. | San Francisco Pioneers | California League | San Francisco, CA | |
| Tillson | tillso002--- | 1888 | 3 g. | San Francisco Emersons | California State League | San Francisco, CA | |
| Timely? | 1888 | 7/4 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Tincham | 1888 | 2 g. | Oakland Tribunes | California State League | Oakland, CA | ||
| Ledell Titcomb | titcom001can | 1888 | 23 g. | New York | National League | New York, NY | |
| John Tobias | tobias002joh | 1888 | 4/8-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| John Tobias | tobias002joh | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| John Tobias | tobias002joh | 1888 | 7/14-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Tobin | tobin-001--- | 1888 | Albany Ridgefields | Independent | Albany, NY | ||
| Tobin | tobin-001--- | 1888 | 9/1 | Albany Governors | International Association | Albany, NY | |
| George Toffling | toffli001geo | 1888 | 4/28-9/7 | Lowell Chippies | New England League | Lowell, MA | |
| Phil Tomney | tomney001phi | 1888 | 4/28-9/6 | Allentown Peanuts | Central League | Allentown, PA | |
| Phil Tomney | tomney001phi | 1888 | 9/7- | 34 g. | Louisville | American Association | Louisville, KY |
| Toohey | toohey001--- | 1888 | 2 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Edward Toohey | toohey001edw | 1888 | +5/19- | Lincoln Tree Planters | Western League | Lincoln, NE | |
| Peter Toole | 1888 | no g. | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | ||
| Steve Toole | toole-001ste | 1888 | 13 g. | Kansas City | American Association | Kansas City, MO | |
| Steve Toole | toole-001ste | 1888 | 7/28-9/15+ | Rochester Jingoes | International Association | Rochester, NY | |
| Frank Torreyson | torrey001fra | 1888 | 4/22-? | Mansfield | Tri-State League | Mansfield, OH | |
| Frank Torreyson | torrey001fra | 1888 | McKeesport | AllegCo | McKeesport, PA | ||
| Thayer Torreyson | torrey001tha | 1888 | 5/1-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| George Townsend | townse002geo | 1888 | 42 g. | Philadelphia | American Association | Philadelphia, PA | |
| Jim Toy | toy---001jim | 1888 | 4/28-9/18+ | Rochester Jingoes | International Association | Rochester, NY | |
| Bill Traffley | traffl001bil | 1888 | 5/2-10/9 | 69 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Trapper | trappe002--- | 1888 | 4/8 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Charles Trask | trask-001cha | 1888 | 5/21-8/3 | Salem Witches | New England League | Salem, MA | |
| Charles Trask | trask-001cha | 1888 | 8/18-9/29 | Easton | Central League | Easton, PA | |
| Frank Traut | traut-001fra | 1888 | 3/30-6/21 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Ed Tray | tray--001edw | 1888 | 3/30-7/8 | Galveston Giants | Texas League | Galveston, TX | |
| Ed Tray | tray--001edw | 1888 | 7/11-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| Ed Tray | tray--001edw | 1888 | 9/8-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Jim Tray | tray--001jim | 1888 | +5/17+ | South Bend | Independent | South Bend, IN | |
| Jim Tray | tray--001jim | 1888 | +7/4-8/2+ | South Bend | Indiana State League | South Bend, IN | |
| Jim Tray | tray--001jim | 1888 | 9/6-9/27 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| John Tray | tray--001joh | 1888 | 6/19 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| George Treadway | treadw001geo | 1888 | 43 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| George Treadway | treadw001geo | 1888 | Bloomington Reds | Central Interstate League | Bloomington, IL | ||
| George Treadway | treadw001geo | 1888 | 9/22-9/30 | 7 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Walter Trenchard | 1888 | 7/28-8/14 | Umpire | Tx-So | , | ||
| Tribon | 1888 | 5 g. | San Francisco Emersons | California State League | San Francisco, CA | ||
| Trost | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Mike Trost | trost-001mik | 1888 | Lancaster | Independent | Lancaster, PA | ||
| Mike Trost | trost-001mik | 1888 | 7/17-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | |
| Sam Trott | trott-001sam | 1888 | 31 g. | Baltimore | American Association | Baltimore, MD | |
| Sam Trott | trott-001sam | 1888 | 9/5-10/6 | 18 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Dasher Troy | troy--001das | 1888 | 4/28-8/2 | Troy Trojans | International Association | Troy, NY | |
| Dasher Troy | troy--001das | 1888 | 8/23-9/29 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Truby | 1888 | 7/7 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Harry Truby | truby-002har | 1888 | 5 g. | Rockford | Central Interstate League | Rockford, IL | |
| Harry Truby | truby-002har | 1888 | +7/4-8/2+ | South Bend | Indiana State League | South Bend, IN | |
| Truehart | trueha001--- | 1888 | 4/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Job Trusty | trusty001job | 1888 | 5/5-6/6 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | |
| Sheppard Trusty | 1888 | Cuban Giants | Independent | Cuban, | |||
| Tommy Tucker | tucker003tho | 1888 | 136 g. | Baltimore | American Association | Baltimore, MD | |
| William Tuckerman | tucker006wil | 1888 | 5/6-10/4 | 42 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Turner | 1888 | 6/20 | Camden | PhilReg | Camden, NJ | ||
| Turner | turner008--- | 1888 | 6/9 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Frank Turner | turner002the | 1888 | 4/30-8/2 | Salem Witches | New England League | Salem, MA | |
| Frank Turner | turner002the | 1888 | 2 g. | Dubuque | Central Interstate League | Dubuque, IA | |
| Frank Turner | turner002the | 1888 | 8/18-9/26 | Easton | Central League | Easton, PA | |
| Frank Turner | turner002the | 1888 | Royalston | Independent | Royalston, MA | ||
| Thomas Turner | turner006tho | 1888 | 5/1- | 58 g. | Peoria Reds | Central Interstate League | Peoria, IL |
| Thomas Turner | turner006tho | 1888 | 8/2-10/7 | 48 g. | Chicago Maroons | Western Association | Chicago, IL |
| W. Turner | turner004w-- | 1888 | 6/19 | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| Tuttle | 1888 | 7/12-7/30 | Chester Houston | PhilReg | Chester, PA | ||
| Art Twineham | twineh002art | 1888 | 31 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Art Twineham | twineh002art | 1888 | Albuquerque | NMSt | Albuquerque, NM | ||
| Larry Twitchell | twitch001lar | 1888 | 131 g. | Detroit | National League | Detroit, MI | |
| Tyndale | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Jim Tyng | tyng--001jim | 1888 | Philadelphia Reserves | Independent | Philadelphia, PA | ||
| Jim Tyng | tyng--001jim | 1888 | 6/13 | 1 g. | Philadelphia | National League | Philadelphia, PA |
| Jim Tyng | tyng--001jim | 1888 | +7/21- | Philadelphia Young Americans | Independent | Philadelphia, PA | |
| Joseph Ukotter | ukotte001jos | 1888 | 4/8-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Joseph Ukotter | ukotte001jos | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Joseph Ukotter | ukotte001jos | 1888 | 7/17-8/14 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| John Unrod | 1888 | 6/27-8/11 | Chester Houston | PhilReg | Chester, PA | ||
| J. D. Updegrove | 1888-89 | U. of Pennsylvania | College | , | |||
| Bill Urquhart | urquha001wil | 1888 | 4/30-5/30 | Elmira | Central League | Elmira, NY | |
| Bill Urquhart | urquha001wil | 1888 | 6/30-9/15 | Seneca Falls | Central New York League | Seneca Falls, NY | |
| John Vactor | vactor001joh | 1888 | New York Gorhams | Independent | New York, NY | ||
| Gene Vadeboncoeur | vadebo001gen | 1888 | 4/28-7/2 | Easton | Central League | Easton, PA | |
| Vails | vails-001--- | 1888 | 7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Howard Vallee | vallee001how | 1888 | 5/5-6/2 | Camden | PhilReg | Camden, NJ | |
| Howard Vallee | vallee001how | 1888 | 7/11-7/17 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Howard Vallee | vallee001how | 1888 | +8/4+ | Chester | Independent | Chester, PA | |
| Howard Vallee | vallee001how | 1888 | 8/9-8/14 | Norristown | PhilReg | Norristown, PA | |
| Thomas Vallelly | vallel001tho | 1888 | 5/8- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| Hobart Van Alstyne | vanals001hob | 1888 | 4/28-9/29 | Elmira | Central League | Elmira, NY | |
| Ike Van Burkalow | vanbur001ike | 1888 | 6/26 | MLB Umpire | American Association | , | |
| Bill Van Dyke | vandyk001bil | 1888 | 4/28-10/9 | 118 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Charles Van Haltren | vanhal001cha | 1888 | San Francisco Pioneers | California League | San Francisco, CA | ||
| Charles Van Haltren | vanhal001cha | 1888 | 5 g. | Oakland Tribunes | California State League | Oakland, CA | |
| George Van Haltren | vanhal001geo | 1888 | 81 g. | Chicago | National League | Chicago, IL | |
| Van Horn | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Van Wagner | 1888 | 5 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| Dick Van Zant | vanzan001dic | 1888 | 4/26-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Dick Van Zant | vanzan001dic | 1888 | 10/4- | 10 g. | Cleveland | American Association | Cleveland, OH |
| Fred Van Zant | 1888 | Staten Island | Independent | Staten Island, NY | |||
| Farmer Vaughn | vaughn001far | 1888 | 4/9-6/25 | Memphis Grays | Southern League | Memphis, TN | |
| Farmer Vaughn | vaughn001far | 1888 | -7/15 | 51 g. | Louisville | American Association | Louisville, KY |
| Peek-A-Boo Veach | veach-001pee | 1888 | 4/28-7/15 | 55 g. | St. Paul Apostles | Western Association | St. Paul, MN |
| Peek-A-Boo Veach | veach-001pee | 1888 | 7/29-10/1 | 50 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Lee Viau | viau--001lee | 1888 | Dartmouth Col. | College | , | ||
| Lee Viau | viau--001lee | 1888 | 4/22- | 43 g. | Cincinnati | American Association | Cincinnati, OH |
| Tom Vickery | vicker001tom | 1888 | +7/18-8/1+ | Burlington | Independent | Burlington, NJ | |
| Bill Vinton | vinton001bil | 1888 | 7/31-8/4 | Lowell Chippies | New England League | Lowell, MA | |
| Jake Virtue | virtue001jak | 1888 | 4/23-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| Visner | visner003--- | 1888 | 3 g. | Decatur | Central Interstate League | Decatur, IL | |
| Joe Visner | visner001joe | 1888 | 4/28-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| O.S. Visner | visner001o-- | 1888 | Hamilton Hams | International Association | Hamilton, ON | ||
| Philip Voegtle | voetle001--- | 1888 | Coal Creeks | Independent | , | ||
| Peter J. Vogel | vogel-001jak | 1888 | Spring training | St. Paul Apostles | Western Association | St. Paul, MN | |
| Edward Vogt | vogt--001edw | 1888 | 7/17-7/27 | Philadelphia Kensington | PhilReg | Philadelphia, PA | |
| Voirel | voirel000--- | 1888 | +6/19-6/20+ | Fort Wayne | Indiana State League | Fort Wayne, IN | |
| F. Voris | 1888 | 5/1-6/5+ | Umpire | CIntSt | , | ||
| Alex Voss | voss--001ale | 1888 | 4/9-5/7 | Charleston Seagulls | Southern League | Charleston, SC | |
| Alex Voss | voss--001ale | 1888 | 5/23-6/9 | Birmingham Maroons | Southern League | Birmingham, AL | |
| Alex Voss | voss--001ale | 1888 | 7/26-8/10 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Woody Wagenhorst | wagenh001woo | 1888 | 6/25-6/26 | 2 g. | Philadelphia | National League | Philadelphia, PA |
| Woody Wagenhorst | wagenh001woo | 1888 | Cape May | Independent | Cape May, NJ | ||
| Amos Walbridge | walbri001amo | 1888 | 5/19-8/13 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Rolla Walbridge | walbri001rol | 1888 | 7/28-8/1 | Worcester Grays | New England League | Worcester, MA | |
| Fleet Walker | walker001fle | 1888 | 4/28-9/18+ | Syracuse Stars | International Association | Syracuse, NY | |
| George Walker | walker002geo | 1888 | 4/28-7/22 | Worcester Grays | New England League | Worcester, MA | |
| George Walker | walker002geo | 1888 | 8/1-9/20 | 4 g. | Baltimore | American Association | Baltimore, MD |
| Joe Walsh | walsh-002joe | 1888 | Spring training | Omaha Omahogs/Lambs | Western Association | Omaha, NE | |
| Joe Walsh | walsh-002joe | 1888 | 5/2-8/14 | 77 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Joe Walsh | walsh-002joe | 1888 | 8/16-10/7 | 44 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| John Walsh | walsh-014joh | 1888 | 40 g. | Toledo Maumees | Tri-State League | Toledo, OH | |
| John Walsh | walsh-014joh | 1888 | 6/25-7/4 | Oswego | Eastern International League | Oswego, NY | |
| John Walsh | walsh-014joh | 1888 | 29 g. | Auburn Yankees | Central New York League | Auburn, NY | |
| M. Walsh | walsh-002m-- | 1888 | 6/13-7/9 | Albany Governors | International Association | Albany, NY | |
| Mickey Walsh | walsh-005mic | 1888 | 4/28-7/28 | Buffalo Bisons | International Association | Buffalo, NY | |
| Walters | 1888 | 6/25 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Walton | walton002--- | 1888 | 5/30-6/15 | Hazleton Pugilisits | Central Pennsylvania League | Hazleton, PA | |
| Walton | walton002--- | 1888 | 6/26-7/18 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| John Ward | ward--002mon | 1888 | 122 g. | New York | National League | New York, NY | |
| Piggy Ward | ward--002fra | 1888 | 5/19-8/11 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Piggy Ward | ward--002fra | 1888 | 8/15-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| Ware | ware--011--- | 1888 | 8/12 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| J.E. Ware | ware--001j-- | 1888 | +5/12- | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| Al Warner | warner002al- | 1888 | 5/16-6/20 | Wilkes-Barre Barons | Central League | Wilkes-Barre, PA | |
| Edward Warner | warner003edw | 1888 | 5/1-8/7 | 35 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Warren | 1888 | 7 g. | Sacramento | California State League | Sacramento, CA | ||
| Bill Watkins | watkin002bil | 1888 | Detroit | National League | Detroit, MI | ||
| Bill Watkins | watkin002bil | 1888 | Kansas City | American Association | Kansas City, MO | ||
| Arthur Watson | watson004art | 1888 | 5/2-6/ | 15 g. | Decatur | Central Interstate League | Decatur, IL |
| Charles Watson | watson016--- | 1888 | 8/15 | 1 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Walter Watson | watson001mot | 1888 | 4/27-8/28 | Zanesville Kickapoos | Tri-State League | Zanesville, OH | |
| Doc Watts | watts-004--- | 1888 | 8/25 | 1 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Farmer Weaver | weaver001far | 1888 | 4/8-7/1 | Austin Senators/San Antonio | Texas League | Austin, TX | |
| Farmer Weaver | weaver001far | 1888 | 7/4-7/9 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Farmer Weaver | weaver001far | 1888 | 7/14-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Farmer Weaver | weaver001far | 1888 | 9/16 - | 26 g. | Louisville | American Association | Louisville, KY |
| Webb | webb--001--- | 1888 | 6/30-7/3 | Binghamton Crickets | Central League | Binghamton, NY | |
| Webb | 1888 | 5/5-6/2 | Norristown | PhilReg | Norristown, PA | ||
| Webb | 1888 | 7/11-7/17 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | ||
| Webber | 1888 | +6/4-8/6 | Watertown | Eastern International League | Watertown, NY | ||
| H. Webber | webber001h-- | 1888 | +5/29+ | Lafayette | Indiana State League | Lafayette, IN | |
| H. Webber | webber001h-- | 1888 | 1 g. | Lafayette | Central Interstate League | Lafayette, IN | |
| H. Webber | webber001h-- | 1888 | 6/11-7/14+ | Elkhart | Indiana State League | Elkhart, IN | |
| Harry Webber | webber002har | 1888 | Sedalia | Independent | Sedalia, MO | ||
| Peter Webber | webber002pet | 1888 | 4/8-7/3 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Peter Webber | webber002pet | 1888 | 7/12-7/30 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Peter Webber | webber002pet | 1888 | 9/4-10/1 | 10 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Joe Weber | weber-001joe | 1888 | Watertown | Eastern International League | Watertown, NY | ||
| Edward Webster | webste003edw | 1888 | 6/6-6/9 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Edward Webster | webste003edw | 1888 | Portland | New England League | Portland, ME | ||
| Edward Webster | webste003edw | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| Pete Weckbecker | weckbe001pet | 1888 | 4/28-9/19+ | Albany Governors | International Association | Albany, NY | |
| William Wehrle | wehrle002wil | 1888 | 4/1-7/7 | Galveston Giants | Texas League | Galveston, TX | |
| William Wehrle | wehrle002wil | 1888 | 7/12-8/0 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| William Wehrle | wehrle002wil | 1888 | 11 g. | Stockton | California League | Stockton, CA | |
| August Weidel | weidel001aug | 1888 | 8/9-8/14 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | |
| August Weidel | weidel001aug | 1888 | 7/21 | Philadelphia Solar Tips | PhilReg | Philadelphia, PA | |
| Charles Weidensaul | weiden002cha | 1888 | 5/19-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Harry Weidensaul | weiden001har | 1888 | 5/19-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| George Weidman | wiedma001stu | 1888 | 2 g. | New York | National League | New York, NY | |
| George Weidman | wiedma001stu | 1888 | 8/10-9/15+ | Toronto Canucks | International Association | Toronto, ON | |
| Podge Weihe | weihe-001pod | 1888 | 5/2-5/7 | 2 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| Podge Weihe | weihe-001pod | 1888 | 5/18-6/18 | Lima Lushers | Tri-State League | Lima, OH | |
| Frank Weikart | weiker001fra | 1888 | 4/9-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Frank Weikart | weiker001fra | 1888 | 7/10-8/5 | Houston Babies | Texas-Southern League | Houston, TX | |
| Frank Weikart | weiker001fra | 1888 | 8/13-8/23 | San Antonio Missionaries | Texas-Southern League | San Antonio, TX | |
| Frank Weikart | weiker001fra | 1888 | Spring training | St. Louis Whites | Western Association | St. Louis, MO | |
| Welch | welch-046--- | 1888 | 7/9 | Albany Governors | International Association | Albany, NY | |
| Curt Welch | welch-001cur | 1888 | 136 g. | Philadelphia | American Association | Philadelphia, PA | |
| Larry Welch | welch-001lar | 1888 | 4/23-8/25 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Martin Welch | 1888 | NMSt | , | ||||
| Mickey Welch | welch-003mic | 1888 | 47 g. | New York | National League | New York, NY | |
| Patrick Welch | welch-003pat | 1888 | 4/26-5/3 | Jackson Jaxons | Tri-State League | Jackson, MI | |
| Tub Welch | welch-001tub | 1888 | 4/7-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| Tub Welch | welch-001tub | 1888 | 7/16-9/18+ | Buffalo Bisons | International Association | Buffalo, NY | |
| Wells | 1888 | Burlington | Independent | Burlington, NJ | |||
| Frank Wells | wells-002fra | 1888 | 4/28-6/13 | 6 g. | Des Moines Prohibitionists | Western Association | Des Moines, IA |
| Frank Wells | wells-002fra | 1888 | 7/4-9/30 | 28 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Jake Wells | wells-001jak | 1888 | 5/1-8/2 | 21 g. | Kansas City Blues | Western Association | Kansas City, MO |
| Jake Wells | wells-001jak | 1888 | 8/10 - | 16 g. | Detroit | National League | Detroit, MI |
| Patrick Welsh | welsh-001pat | 1888 | 4/22-5/20 | Columbus Senators | Tri-State League | Columbus, OH | |
| Patrick Welsh | welsh-001pat | 1888 | 9/2-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Wenner | 1888 | 6/20 | Camden | PhilReg | Camden, NJ | ||
| Jack Wentz | wentz-001jac | 1888 | 4/7-7/4 | Dallas Hams | Texas League | Dallas, TX | |
| Jack Wentz | wentz-001jac | 1888 | 7/10-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Perry Werden | werden001per | 1888 | 4/7-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Perry Werden | werden001per | 1888 | 7/11-7/13 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Perry Werden | werden001per | 1888 | 7/25-9/18+ | Troy Trojans | International Association | Troy, NY | |
| Perry Werden | werden001per | 1888 | 3 g. | Washington | National League | Washington, DC | |
| Joe Werrick | werric001joe | 1888 | 111 g. | Louisville | American Association | Louisville, KY | |
| Buck West | west--001buc | 1888 | 4/22-8/19 | Columbus Senators | Tri-State League | Columbus, OH | |
| Buck West | west--001buc | 1888 | 8/21-9/1 | Lima Lushers | Tri-State League | Lima, OH | |
| Buck West | west--001buc | 1888 | 9/2-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Bob Westlake | westla001rob | 1888 | 5/8-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Bob Westlake | westla001rob | 1888 | 8/31-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| George Westlake | westla002geo | 1888 | 4/26-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| George Westlake | westla002geo | 1888 | 8/31-9/22 | Mansfield | Tri-State League | Mansfield, OH | |
| Anthony Wetzel | wetzel001ant | 1888 | 8 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Anthony Wetzel | wetzel001ant | 1888 | +6/8-6/9+ | Frankfort | Indiana State League | Frankfort, IN | |
| George Wetzell | wetzel001sho | 1888 | 5/12-5/26 | Philadelphia Quaker City | PhilReg | Philadelphia, PA | |
| George Wetzell | wetzel001sho | 1888 | 5/30-7/7 | Shamokin Maroons | Central Pennsylvania League | Shamokin, PA | |
| George Wetzell | wetzel001sho | 1888 | 7/17-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| George Wetzell | wetzel001sho | 1888 | 10 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| Gus Weyhing | weyhin001aug | 1888 | 48 g. | Philadelphia | American Association | Philadelphia, PA | |
| John Weyhing | weyhin001joh | 1888 | 7/13 - | 8 g. | Cincinnati | American Association | Cincinnati, OH |
| John Whalen | whalen003joh | 1888 | 4/23-8/17 | Kalamazoo Kazoos | Tri-State League | Kalamazoo, MI | |
| J. Wharry | 1888 | 5/31 | Kingston | Eastern International League | Kingston, ON | ||
| Alfred Whartenby | wharte001alf | 1888 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Wheeler | wheele002--- | 1888 | 5/22 | Shenandoah Hungarian Rioters | Central Pennsylvania League | Shenandoah, PA | |
| Fred Wheeler | wheele001fre | 1888 | 5/30-6/21 | Manchester Maroons | New England League | Manchester, NH | |
| Harry Wheeler | wheele002har | 1888 | 4/28-6/27 | Worcester Grays | New England League | Worcester, MA | |
| Harry Wheeler | wheele002har | 1888 | 7/11-9/7 | Manchester Maroons | New England League | Manchester, NH | |
| Bobby Wheelock | wheelo001bob | 1888 | 4/28-9/7 | Worcester Grays | New England League | Worcester, MA | |
| Lew Whistler | whistl002lew | 1888 | 4/20-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| Lew Whistler | whistl002lew | 1888 | 6/13-7/4 | Houston Babies/Red Stockings | Texas League | Houston, TX | |
| Lew Whistler | whistl002lew | 1888 | 7/10-8/7 | Houston Babies | Texas-Southern League | Houston, TX | |
| Lew Whistler | whistl002lew | 1888 | 8/13-8/27 | Galveston Giants | Texas-Southern League | Galveston, TX | |
| H.W. Whitaker | whitak001h-- | 1888 | Philadelphia AA Reserves | Independent | Philadelphia, PA | ||
| H.W. Whitaker | whitak001h-- | 1888 | 7/25-8/2 | Norristown | PhilReg | Norristown, PA | |
| Pat Whitaker | whitak001pat | 1888 | 4/8-7/2 | Dallas Hams | Texas League | Dallas, TX | |
| Pat Whitaker | whitak001pat | 1888 | 7/11-9/2 | Dallas Hams | Texas-Southern League | Dallas, TX | |
| Pat Whitaker | whitak001pat | 1888 | 10/11 - | 2 g. | Baltimore | American Association | Baltimore, MD |
| White | white-046--- | 1888 | 7/18-7/26 | Troy Trojans | International Association | Troy, NY | |
| A. E. White | 1888 | +5/23-7/27+ | Frankfort | Indiana State League | Frankfort, IN | ||
| A.E. White | white-000ae- | 1888 | Logansport | Indiana State League | Logansport, IN | ||
| Bill White | white-003bil | 1888 | 49 g. | Louisville | American Association | Louisville, KY | |
| Bill White | white-003bil | 1888 | 76 g. | St. Louis Browns | American Association | St. Louis, MO | |
| Deacon White | white-002dea | 1888 | 125 g. | Detroit | National League | Detroit, MI | |
| Joe White | white-001joe | 1888 | +5/12- | Leavenworth Soldiers | Western League | Leavenworth, KS | |
| Milt Whitehead | whiteh001mil | 1888 | 67 g. | Stockton | California League | Stockton, CA | |
| Guerdon Whiteley | whitel001gue | 1888 | Spring training | Des Moines Prohibitionists | Western Association | Des Moines, IA | |
| Guerdon Whiteley | whitel001gue | 1888 | Hutchinson | Western League | Hutchinson, KS | ||
| Guerdon Whiteley | whitel001gue | 1888 | 7/4-7/28 | 20 g. | Sioux City Corn Huskers | Western Association | Sioux City, IA |
| Guerdon Whiteley | whitel001gue | 1888 | 8/25 | 1 g. | Davenport Onion Weeders | Western Association | Davenport, IA |
| Ed Whiting | whitin001ed- | 1888 | Ogdensburg | Independent | Ogdensburg, NY | ||
| Art Whitney | whitne002art | 1888 | 90 g. | New York | National League | New York, NY | |
| Jim Whitney | whitne001jim | 1888 | 42 g. | Washington | National League | Washington, DC | |
| Billy Whyte | whyte-000bil | 1888 | Cuban Giants | Independent | Cuban, | ||
| George Whyte | whyte-001geo | 1888 | Charleston Seagulls | Southern League | Charleston, SC | ||
| George Whyte | whyte-001geo | 1888 | Leadville Blues | Independent | Leadville, CO | ||
| Wild Bill Widner | widner001wil | 1888 | 4/7-7/4 | New Orleans Pelicans | Southern League | New Orleans, LA | |
| Wild Bill Widner | widner001wil | 1888 | 7/11-7/13 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Wild Bill Widner | widner001wil | 1888 | 15 g. | Washington | National League | Washington, DC | |
| Andrew Wiedman | weidma001and | 1888 | 5/11-5/26 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Andrew Wiedman | weidma001and | 1888 | -7/8 | Rochester Ninth Ward Stars | Independent | Rochester, NY | |
| Andrew Wiedman | weidma001and | 1888 | 22 g. | Canandaigua | Central New York League | Canandaigua, NY | |
| Andrew Wiedman | weidma001and | 1888 | Portland | New England League | Portland, ME | ||
| Andrew Wiedman | weidma001and | 1888 | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | ||
| George Wilbur | wilbur002geo | 1888 | Janesville Mutual | Independent | Janesville, WI | ||
| Wilcox | wilcox005--- | 1888 | 5/22 | Albany Governors | International Association | Albany, NY | |
| Horace Wilds | wilds-001hor | 1888 | 5 g. | Oakland Tribunes | California State League | Oakland, CA | |
| Wiley | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| W. W. Wilkinson | 1888 | Aberdeen Nonpareil | Independent | Aberdeen, SD | |||
| Wilks | 1888 | 7/25-7/31 | Philadelphia Somerset | PhilReg | Philadelphia, PA | ||
| Williams | 1888 | Philadelphia Highland | Independent | Philadelphia, PA | |||
| Williams | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA | |||
| Charles Williams | willia015cha | 1888 | 5/10-7/4 | Charleston Seagulls | Southern League | Charleston, SC | |
| Charles Williams | willia015cha | 1888 | 7/20-8/30 | Sandusky Fish Eaters | Tri-State League | Sandusky, OH | |
| Clarence Williams | willia010cla | 1888 | Cuban Giants | Independent | Cuban, | ||
| Edward Williams | willia013edw | 1888 | 4/28-5/23 | Buffalo Bisons | International Association | Buffalo, NY | |
| Edward Williams | willia013edw | 1888 | 6/1-9/28+ | Allentown Peanuts | Central League | Allentown, PA | |
| G. Williams | willia003g-- | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | ||
| G. W. Williams | 1888 | Waterbury | Connecticut State League | Waterbury, CT | |||
| George Williams | willia008geo | 1888 | Cuban Giants | Independent | Cuban, | ||
| Ike Williams | 1888 | Bridgeport | Connecticut State League | Bridgeport, CT | |||
| Jimmy Williams | willia004jim | 1888 | Cleveland | American Association | Cleveland, OH | ||
| Owen Williams | willia001owe | 1888 | 54 g. | Davenport | Central Interstate League | Davenport, IA | |
| Owen Williams | willia001owe | 1888 | 8/6-9/2 | Canton Nadjys | Tri-State League | Canton, OH | |
| Owen Williams | willia001owe | 1888 | 9/10-9/23 | Columbus Senators | Tri-State League | Columbus, OH | |
| Percy Williams | 1888 | SW? | , | ||||
| Williamson | willia001--- | 1888 | 6/2-6/6 | Elmira | Central League | Elmira, NY | |
| Ed Williamson | willia001ned | 1888 | 132 g. | Chicago | National League | Chicago, IL | |
| Charles Willis | willis005cha | 1888 | 5/14- | Portsmouth Lillies | New England Interstate League | Portsmouth, NH | |
| Charles Willis | willis005cha | 1888 | 7/24-9/7 | Portsmouth Lillies | New England League | Portsmouth, NH | |
| Walt Wilmot | wilmot001wal | 1888 | 4/20 - | 119 g. | Washington | National League | Washington, DC |
| Wilson | wilson130--- | 1888 | 2 g. | Crawfordsville Hoosiers | Central Interstate League | Crawfordsville, IN | |
| Albin Wilson | wilson002alb | 1888 | 5/23-6/20 | Albany Governors | International Association | Albany, NY | |
| Bert Wilson | wilson004ber | 1888 | Fremont | Independent | Fremont, OH | ||
| Bert Wilson | wilson004ber | 1888 | 8/24-9/10 | 5 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| Bill Wilson | wilson003bil | 1888 | Champaign | In-Il | Champaign, IL | ||
| Jack Wilson | wilson007jac | 1888 | 5 g. | Oakland Tribunes | California State League | Oakland, CA | |
| Tug Wilson | wilson001tug | 1888 | 4/30-9/5 | 60 g. | Omaha Omahogs/Lambs | Western Association | Omaha, NE |
| George Winkelman | winkel001geo | 1888 | 5/2-8/14 | 38 g. | Minneapolis Millers | Western Association | Minneapolis, MN |
| George Winkelman | winkel001geo | 1888 | 8/17-10/7 | 18 g. | Milwaukee Brewers/Creams | Western Association | Milwaukee, WI |
| M. I. Winkler | 1888 | 5/12-5/23 | Camden | PhilReg | Camden, NJ | ||
| M. I. Winkler | 1888 | Burlington | Independent | Burlington, NJ | |||
| Winston | 1888 | Norristown | PhilReg | Norristown, PA | |||
| Winters | 1888 | Philadelphia AA Reserves | Independent | Philadelphia, PA | |||
| Nick Wise | wise--002nic | 1888 | 6/20 | 1 g. | Boston | National League | Boston, MA |
| Sam Wise | wise--001sam | 1888 | 105 g. | Boston | National League | Boston, MA | |
| C. Wissohe | wissoh000c-- | 1888 | Fort Wayne | Indiana State League | Fort Wayne, IN | ||
| Ed Wiswell | wiswel001ed- | 1888 | 45 g. | Bloomington Reds | Central Interstate League | Bloomington, IL | |
| Witherly | 1888 | 7 g. | Santa Cruz | California State League | Santa Cruz, CA | ||
| E.A. Wochner | wochne001e-- | 1888 | Bloomington Reds | Central Interstate League | Bloomington, IL | ||
| Oscar Woehrlin | woerli001joe | 1888 | St. Louis Waibel | Independent | St. Louis, MO | ||
| Chicken Wolf | wolf--001chi | 1888 | 128 g. | Louisville | American Association | Louisville, KY | |
| Philip Wolf | 1888 | 5/5-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Abe Wolstenholme | wolste001abe | 1888 | 6/29-8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| E. H. Wood | 1888 | 5/1-6/5+ | Umpire | CIntSt | , | ||
| George Wood | wood--004geo | 1888 | 106 g. | Philadelphia | National League | Philadelphia, PA | |
| Jeff Wood | wood--001jef | 1888 | 6/5-6/9 | Hamilton Hams | International Association | Hamilton, ON | |
| Jimmy Wood | wood--005jam | 1888 | 4/7-6/30 | Memphis Grays | Southern League | Memphis, TN | |
| Pete Wood | wood--001pet | 1888 | 4/28-9/18+ | Hamilton Hams | International Association | Hamilton, ON | |
| William Wood | wood--012wil | 1888 | 4/23-8/2 | Canton Nadjys | Tri-State League | Canton, OH | |
| Woodbury | woodbu003--- | 1888 | 5/3-5/5 | Decatur | Central Interstate League | Decatur, IL | |
| Fred Woodcock | woodco001fre | 1888-89 | Dartmouth Col. | College | , | ||
| Fred Woodcock | woodco001fre | 1888 | Brattleboro | Independent | Brattleboro, VT | ||
| Fred Woodcock | woodco001fre | 1888 | Northampton | Independent | Northampton, MA | ||
| Woods | 1888 | 1 g. | Waterloo | Central New York League | Waterloo, NY | ||
| Woods | 1888 | 6/30-8/30 | Seneca Falls | Central New York League | Seneca Falls, NY | ||
| Woods | woods-003--- | 1888 | 8/4-8/14 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Bob Woods | woods-004rob | 1888 | 7/16-9/27 | Toledo Maumees | Tri-State League | Toledo, OH | |
| Woodward | 1888 | 1 g. | Oakland Clevelands | California State League | Oakland, CA | ||
| William Work | works-001wil | 1888 | 4/14-5/24 | San Antonio Missionaries/Cowboys | Texas League | San Antonio, TX | |
| William Work | works-001wil | 1888 | 6/13-7/4 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| William Work | works-001wil | 1888 | 7/15-9/2 | New Orleans Pelicans | Texas-Southern League | New Orleans, LA | |
| Wraight | 1888 | 1 g. | Penn Yan | Central New York League | Penn Yan, NY | ||
| Wright | wright057--- | 1888 | +5/19- | Lincoln Tree Planters | Western League | Lincoln, NE | |
| Harry Wright | wright004har | 1888 | Philadelphia | National League | Philadelphia, PA | ||
| Hiram Wright | wright001bil | 1888 | 5/3-9/18+ | Troy Trojans | International Association | Troy, NY | |
| Pat Wright | wright003pat | 1888 | 5 g. | Danville Browns | Central Interstate League | Danville, IL | |
| Rasty Wright | wright001ras | 1888 | 4/28-9/19+ | Syracuse Stars | International Association | Syracuse, NY | |
| Robert Wrightson | wright009rob | 1888 | 5/9-8/11 | Philadelphia Frankford | PhilReg | Philadelphia, PA | |
| Will Wynne | wynne-002bil | 1888-94 | Wake Forest | College | , | ||
| Henry Yaik | yaik--001hen | 1888 | 4/27-9/22 | Wheeling National Citys/Nailers | Tri-State League | Wheeling, WV | |
| Henry Yaik | yaik--001hen | 1888 | 10/3-10/4 | 2 g. | Pittsburgh | National League | Pittsburgh, PA |
| Henry Yarnell | yarnel001hen | 1888 | Philadelphia Young Americans | Independent | Philadelphia, PA | ||
| Jack Yeagle | yeagle001joh | 1888 | 4/7-5/3 | Fort Worth Panthers | Texas League | Fort Worth, TX | |
| Yearsley | yearsl001--- | 1888 | 6/12-6/16 | Mahanoy City | Central Pennsylvania League | Mahanoy City, PA | |
| Yearsley | yearsl001--- | 1888 | 6/23- | FIND | Independent | , | |
| W.L. Yeazle | yeazle001w-- | 1888 | Union City | Independent | Union City, CA | ||
| Charles Yingling | yingli001cha | 1888 | Baltimore Reserves | Independent | Baltimore, MD | ||
| Joe Yingling | yingli001joe | 1888 | Baltimore Reserves | Independent | Baltimore, MD | ||
| Billy York | york--001wil | 1888 | +5/23-5/24+ | Logansport | Indiana State League | Logansport, IN | |
| Tom York | york--001tom | 1888 | 4/28-9/29 | Albany Governors | International Association | Albany, NY | |
| Young | young-093--- | 1888 | +7/4+ | South Bend | Indiana State League | South Bend, IN | |
| Young | 1888 | +7/20-8/14 | Kingston | Eastern International League | Kingston, ON | ||
| Young | 1888 | 8/1 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Young | 1888 | Philadelphia Richmond | Independent | Philadelphia, PA | |||
| Ben Young | young-002ben | 1888 | 6/9-7/19 | Umpire | Int | , | |
| George Young | young-003geo | 1888 | 5/19-8/10 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| George Young | young-003geo | 1888 | 8/11-9/29 | Hazleton Pugilists | Central League | Hazleton, PA | |
| J.B. Young | young-001jb- | 1888 | 5/19-8/9 | Mount Carmel | Central Pennsylvania League | Mount Carmel, PA | |
| Otto Young | young-002ott | 1888 | 1 g. | Santa Cruz | California State League | Santa Cruz, CA | |
| Henry Youngman | youngm001hen | 1888 | 5/1- | 29 g. | Danville Browns | Central Interstate League | Danville, IL |
| William Zecher | zecher001wil | 1888 | 4/23-9/23 | Canton Nadjys | Tri-State League | Canton, OH | |
| Henry Zeiher | zeiher001whi | 1888 | +5/9-8/25+ | Philadelphia Riverton | Independent | Philadelphia, PA | |
| Harry Zell | zell--001har | 1888 | 4/28-9/28 | Allentown Peanuts | Central League | Allentown, PA | |
| Zepp | 1888 | 7/18-8/14 | Philadelphia Germantown | PhilReg | Philadelphia, PA | ||
| Ziegler | ziegle001--- | 1888 | 5/8- | Denver Mountain Lions/Mountaineers | Western League | Denver, CO | |
| George Ziegler | ziegle001geo | 1888 | Denver | Denver, CO | |||
| George Ziegler | ziegle001geo | 1888 | Lafayette | Lafayette, IN | |||
| Charles Zimmer | zimmer001cha | 1888 | 65 g. | Cleveland | American Association | Cleveland, OH | |
| Frank Zinn | zinn--001fra | 1888 | 4/18-5/3 | 2 g. | Philadelphia | American Association | Philadelphia, PA |
| Frank Zinn | zinn--001fra | 1888 | Philadelphia AA Reserves | Independent | Philadelphia, PA | ||
| Frank Zinn | zinn--001fra | 1888 | Philadelphia Riverton | Independent | Philadelphia, PA |