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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Ben O'Leary | 1886-1897 | .187 | 8 | 116 | 216 | 160 | 3 | 3.93 | 1909 |
| Dave O'Meara | 1891-1899 | .163 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Danny O'Riordan | 1884-1884 | .218 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| James Oden | 1892-1899 | .205 | 2 | 24 | 45 | 61 | 3 | 5.95 | 290 |
| William Olsen | 1892-1892 | .500 | 0 | 0 | 0 | 0 | 0 | 7.36 | 1 |
| Pat Olson | 1897-1899 | .300 | 9 | 173 | 0 | 0 | 0 | 0.00 | 0 |
| John Otten | 1896-1899 | .227 | 1 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Harry Overton | 1893-1899 | .250 | 0 | 2 | 2 | 3 | 2 | 5.61 | 6 |
| William Owens | 1884-1887 | .274 | 12 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ike Owns | 1891-1899 | .281 | 36 | 447 | 0 | 0 | 0 | 0.00 | 0 |
