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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Cinders | RP | Cleveland Spiders | 30 | 04/15/1867 | Troy | USA | Right | Right | 1.78 m | 78 kg | P450 |
| O'Brien, Darby | LF | Columbus Solons | 34 | 09/01/1863 | Peoria | USA | Right | Right | 1.85 m | 86 kg | P690 |
| O'Brien, Jack | RF | Louisville Colonels | 37 | 06/12/1860 | Philadelphia | USA | Right | Right | 1.78 m | 85 kg | P578 |
| O'Brien, Pete | 2B | Washington Senators | 30 | 06/16/1867 | Chicago | USA | Right | Right | 1.75 m | 78 kg | P450 |
| O'Brien, Tom | LF | Baltimore Orioles | 24 | 02/20/1873 | Verona | USA | Right | Right | 1.80 m | 77 kg | P460 |
| O'Connell, John | 2B | Baltimore Orioles | 28 | 05/05/1869 | Lawrence | USA | Right | Right | 1.75 m | 79 kg | - |
| O'Connor, Frank | RP | Columbus Solons | 29 | 09/15/1868 | Keeseville | USA | Left | Left | 1.83 m | 84 kg | P450 |
| O'Connor, Jack | C | Cincinnati Reds | 31 | 06/02/1866 | St. Louis | USA | Right | Right | 1.78 m | 80 kg | P750 |
| O'Day, Hank | RP | Washington Senators | 35 | 07/08/1862 | Chicago | USA | Right | Right | 1.83 m | 86 kg | P430 |
| O'Flynn, Alistair | RP | Louisville Colonels | 28 | 12/17/1868 | Rubidoux | USA | Right | Right | 1.78 m | 81 kg | P630 |
| O'Hagan, Hal | C | Washington Senators | 28 | 09/30/1869 | Washington | USA | Right | Right | 1.83 m | 85 kg | - |
| O'Meara, Tom | C | Cleveland Spiders | 25 | 12/12/1872 | Chicago | USA | Right | Right | 1.78 m | 81 kg | - |
| O'Neill, Fred | LF | Free Agent | 32 | 05/05/1865 | London | CAN | Right | Right | 1.70 m | 73 kg | - |
| O'Rourke, Mike | RP | Baltimore Orioles | 29 | 05/05/1868 | Unknown | USA | Right | Right | 1.78 m | 88 kg | P450 |
| O'Rourke, Tim | 1B | Washington Senators | 33 | 05/18/1864 | Chicago | USA | Left | Right | 1.78 m | 79 kg | P630 |
| O'Rourke, Tom | C | Boston Beaneaters | 32 | 10/05/1865 | New York | USA | Right | Right | 1.75 m | 77 kg | P450 |
| Oberlander, Doc | RP | Cleveland Spiders | 33 | 05/12/1864 | Waukegan | USA | Right | Left | 1.78 m | 73 kg | P550 |
| Obrein, Lance | RP | Boston Reds | 26 | 01/10/1871 | Santa Rita | USA | Right | Right | 1.68 m | 76 kg | P410 |
| Oldfield, Dave | C | Baltimore Orioles | 32 | 12/18/1864 | Philadelphia | USA | Switch | Left | 1.70 m | 82 kg | P500 |
| Olin, Frank | 1B | Washington Senators | 37 | 01/09/1860 | Unknown | USA | Left | Right | 1.78 m | 80 kg | P605 |
| Orr, Dave | 1B | Columbus Solons | 38 | 09/29/1859 | New York | USA | Right | Right | 1.80 m | 111 kg | P690 |
| Orth, Al | RP | Philadelphia Phillies | 25 | 09/05/1872 | Sedalia | USA | Left | Right | 1.83 m | 91 kg | P430 |
| Otten, Joe | C | St. Louis Cardinals | 27 | 08/05/1870 | Unknown | USA | Right | Right | 1.78 m | 80 kg | - |
