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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 |
| Otis O'Brien | 1881-1895 | 543 | 475 | 1474 | 171 | 330 | 35 | 7 | 7 | 131 | 52 | 40 | 91 | 203 | .224 | .273 | .271 | .545 | 0.1 |
| Joe O'Connell | 1902-1907 | 874 | 850 | 3150 | 302 | 781 | 118 | 45 | 10 | 289 | 122 | 74 | 205 | 365 | .248 | .298 | .323 | .622 | 18.0 |
| 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 |
| Ben O'Leary | 1885-1885 | 22 | 0 | 6 | 2 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 3 | .000 | .000 | .000 | .000 | 0.1 |
| Kid O'Neil | 1901-1907 | 902 | 831 | 3013 | 238 | 676 | 116 | 49 | 20 | 342 | 59 | 61 | 223 | 409 | .224 | .281 | .315 | .596 | 13.5 |
| 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 |
| Ned Okereke | 1881-1881 | 85 | 85 | 320 | 57 | 101 | 18 | 0 | 0 | 29 | 10 | 4 | 58 | 87 | .316 | .418 | .372 | .790 | 2.8 |
| Eddie Olien | 1899-1906 | 16 | 1 | 8 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | .125 | .222 | .125 | .347 | -0.0 |
| Michael Oliver | 1902-1907 | 25 | 1 | 15 | 1 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | .200 | .294 | .267 | .561 | 0.0 |
| Nellie Olson | 1902-1907 | 128 | 92 | 281 | 25 | 50 | 6 | 1 | 0 | 9 | 6 | 4 | 20 | 47 | .178 | .237 | .206 | .443 | 0.4 |
| 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 | 1890-1891 | 110 | 6 | 129 | 13 | 21 | 1 | 1 | 1 | 15 | 9 | 1 | 6 | 14 | .163 | .212 | .209 | .421 | -0.5 |
| 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 | 1889-1901 | 75 | 23 | 101 | 8 | 15 | 5 | 2 | 0 | 6 | 2 | 1 | 8 | 23 | .149 | .223 | .238 | .461 | -0.7 |
