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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Otis O'Brien | 1881-1895 | 194 | 214 | .475 | 3.36 | 490 | 422 | 300 | 18 | 6 | 3616.0 | 3892 | 1350 | 89 | 892 | 1142 |
| Patrick O'Connor | 1878-1878 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 |
| Ben O'Leary | 1885-1885 | 2 | 0 | 1.000 | 3.41 | 22 | 0 | 0 | 0 | 2 | 31.2 | 33 | 12 | 0 | 14 | 7 |
| Myles O'Shea | 1876-1878 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 1 |
| Eddie Olien | 1899-1906 | 1 | 4 | .200 | 4.42 | 16 | 1 | 0 | 0 | 0 | 36.2 | 49 | 18 | 5 | 14 | 5 |
| Michael Oliver | 1902-1907 | 0 | 2 | .000 | 3.80 | 16 | 0 | 0 | 0 | 0 | 23.2 | 31 | 10 | 0 | 7 | 7 |
| Nellie Olson | 1902-1907 | 14 | 29 | .326 | 3.17 | 56 | 47 | 26 | 3 | 1 | 386.1 | 412 | 136 | 3 | 110 | 99 |
| Andrew Overton | 1876-1876 | 15 | 16 | .484 | 2.63 | 34 | 33 | 18 | 0 | 0 | 259.2 | 317 | 76 | 3 | 13 | 49 |
| Harry Overton | 1890-1890 | 3 | 4 | .429 | 4.17 | 35 | 0 | 0 | 0 | 4 | 45.1 | 39 | 21 | 1 | 42 | 19 |
