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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Billy | 1B | Boston Beaneaters | 28 | 03/14/1860 | Albany | USA | Right | Right | 183 cm | 85 kg | P240 |
| O'Brien, Cinders | SP | Cleveland Blues | 21 | 04/15/1867 | Troy | USA | Right | Right | 178 cm | 75 kg | P210 |
| O'Brien, Darby | LF | Indianapolis Hoosiers | 24 | 09/01/1863 | Peoria | USA | Right | Right | 185 cm | 85 kg | P300 |
| O'Brien, Jack K | C | Cleveland Blues | 28 | 06/12/1860 | Philadelphia | USA | Right | Right | 178 cm | 85 kg | P305 |
| O'Brien, Pete | 2B | Washington Nationals | 21 | 06/16/1867 | Chicago | USA | Right | Right | 175 cm | 74 kg | - |
| O'Connell, Pat | CF | Baltimore Orioles | 27 | 06/10/1861 | Bangor | USA | Right | Right | 178 cm | 79 kg | P250 |
| O'Connor, Jack | C | Cincinnati Red Stockings | 22 | 06/02/1866 | St. Louis | USA | Right | Right | 178 cm | 76 kg | P210 |
| O'Day, Hank | RP | Philadelphia Athletics | 26 | 07/08/1862 | Chicago | USA | Right | Right | 183 cm | 84 kg | P294 |
| O'Leary, Dan | LF | Free Agent | 32 | 10/22/1855 | Detroit | USA | Left | Right | 178 cm | 79 kg | - |
| O'Loughlin, Patrick | RF | Philadelphia Quakers | 26 | 06/05/1862 | New York | USA | Right | Right | 178 cm | 83 kg | - |
| O'Rourke, Jim H | C | Boston Beaneaters | 37 | 09/01/1850 | Bridgeport | USA | Right | Right | 173 cm | 84 kg | P750 |
| O'Rourke, Tom | C | Boston Beaneaters | 22 | 10/05/1865 | New York | USA | Right | Right | 175 cm | 72 kg | - |
| Oberbeck, Henry | RP | Cleveland Blues | 30 | 05/17/1858 | St. Louis | USA | Right | Right | 178 cm | 80 kg | P420 |
| Oberlander, Doc | RP | Washington Nationals | 24 | 05/12/1864 | Waukegan | USA | Right | Left | 178 cm | 74 kg | P374 |
| Oldfield, Dave | C | Baltimore Orioles | 23 | 12/18/1864 | Philadelphia | USA | Switch | Left | 171 cm | 80 kg | P220 |
| Olin, Frank | 2B | Cincinnati Red Stockings | 28 | 01/09/1860 | Unknown | USA | Left | Right | 178 cm | 79 kg | P230 |
| Orr, Dave | 1B | Brooklyn Bridegrooms | 28 | 09/29/1859 | New York | USA | Right | Right | 180 cm | 112 kg | P517 |
| Otterson, Billy | SS | Brooklyn Bridegrooms | 26 | 05/04/1862 | Pittsburgh | USA | Right | Right | 170 cm | 57 kg | - |
