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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bill O'Brien | 1876-1877 | .291 | 0 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Jack O'Brien | 1876-1876 | .222 | 0 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Otis O'Brien | 1881-1895 | .224 | 7 | 131 | 194 | 214 | 6 | 3.36 | 1142 |
| Joe O'Connell | 1902-1907 | .248 | 10 | 289 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick O'Connor | 1878-1878 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sam O'Guin | 1878-1878 | .750 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick O'Hanlon | 1876-1877 | .349 | 4 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Leary | 1885-1885 | .000 | 0 | 1 | 2 | 0 | 2 | 3.41 | 7 |
| Kid O'Neil | 1901-1907 | .224 | 20 | 342 | 0 | 0 | 0 | 0.00 | 0 |
| Danny O'Riordan | 1881-1885 | .188 | 2 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Myles O'Shea | 1876-1878 | .185 | 1 | 47 | 0 | 0 | 0 | 0.00 | 1 |
| Ned Okereke | 1881-1881 | .316 | 0 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie Olien | 1899-1906 | .125 | 0 | 0 | 1 | 4 | 0 | 4.42 | 5 |
| Michael Oliver | 1902-1907 | .200 | 0 | 0 | 0 | 2 | 0 | 3.80 | 7 |
| Nellie Olson | 1902-1907 | .178 | 0 | 9 | 14 | 29 | 1 | 3.17 | 99 |
| Joe Osborn | 1883-1889 | .266 | 9 | 303 | 0 | 0 | 0 | 0.00 | 0 |
| Art Osgood | 1890-1891 | .163 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Overton | 1876-1876 | .200 | 0 | 7 | 15 | 16 | 0 | 2.63 | 49 |
| Harry Overton | 1890-1890 | .000 | 0 | 0 | 3 | 4 | 4 | 4.17 | 19 |
| Ike Owns | 1889-1901 | .149 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
