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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | G | GS | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bill O'Brien | 1876-1877 | 78 | 60 | 254 | 40 | 74 | 10 | 1 | 0 | 23 | 4 | 5 | 6 | 17 | .291 | .310 | .339 | .649 | 1.1 |
| Jack O'Brien | 1876-1876 | 57 | 57 | 230 | 21 | 51 | 2 | 3 | 0 | 24 | 11 | 3 | 6 | 12 | .222 | .245 | .257 | .501 | 0.1 |
| Patrick O'Connor | 1878-1878 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | .000 | .000 | .000 | 0.0 |
| Sam O'Guin | 1878-1878 | 16 | 0 | 4 | 0 | 3 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | .750 | .750 | .750 | 1.500 | 0.2 |
| Patrick O'Hanlon | 1876-1877 | 115 | 115 | 493 | 93 | 172 | 14 | 14 | 4 | 82 | 22 | 7 | 8 | 10 | .349 | .365 | .458 | .823 | 4.7 |
| Danny O'Riordan | 1881-1885 | 110 | 92 | 362 | 37 | 68 | 13 | 3 | 2 | 42 | 3 | 2 | 39 | 38 | .188 | .278 | .257 | .535 | 0.0 |
| Myles O'Shea | 1876-1878 | 132 | 126 | 497 | 50 | 92 | 15 | 0 | 1 | 47 | 11 | 7 | 6 | 21 | .185 | .201 | .221 | .422 | -0.5 |
| Otis OBrien | 1881-1889 | 389 | 335 | 1068 | 128 | 246 | 27 | 6 | 5 | 102 | 44 | 30 | 55 | 147 | .230 | .272 | .281 | .553 | -0.4 |
| Ned Okereke | 1881-1881 | 85 | 85 | 320 | 57 | 101 | 18 | 0 | 0 | 29 | 10 | 4 | 58 | 87 | .316 | .418 | .372 | .790 | 2.8 |
| Ben OLeary | 1885-1885 | 22 | 0 | 6 | 2 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 3 | .000 | .000 | .000 | .000 | 0.1 |
| Joe Osborn | 1883-1889 | 770 | 736 | 2915 | 412 | 775 | 120 | 36 | 9 | 303 | 202 | 112 | 188 | 247 | .266 | .320 | .341 | .661 | 11.1 |
| Art Osgood | 1890-1890 | 64 | 6 | 75 | 4 | 13 | 1 | 1 | 0 | 7 | 5 | 0 | 5 | 7 | .173 | .235 | .213 | .448 | -0.3 |
| Andrew Overton | 1876-1876 | 34 | 33 | 90 | 10 | 18 | 1 | 0 | 0 | 7 | 0 | 0 | 0 | 5 | .200 | .198 | .211 | .409 | -0.2 |
| Harry Overton | 1890-1890 | 35 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | .000 | .000 | .000 | .000 | -0.1 |
| Ike Owns | 1889-1889 | 31 | 20 | 77 | 6 | 12 | 3 | 2 | 0 | 4 | 1 | 1 | 6 | 17 | .156 | .224 | .247 | .470 | -0.6 |
