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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ike O'Donnell | 1946-1946 | 2 | 3 | .400 | 5.30 | 7 | 7 | 0 | 0 | 0 | 37.1 | 44 | 22 | 1 | 9 | 31 |
| Mark O'Rourke | 1914-1915 | 21 | 17 | .553 | 4.85 | 62 | 54 | 1 | 0 | 0 | 334.1 | 343 | 180 | 51 | 168 | 437 |
| Bob Oates | 1937-1937 | 1 | 0 | 1.000 | 11.12 | 4 | 0 | 0 | 0 | 0 | 5.2 | 8 | 7 | 0 | 3 | 4 |
| Hector Ocanas | 1930-1930 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 2 |
| Jim Ochs | 1907-1910 | 18 | 24 | .429 | 4.01 | 57 | 55 | 7 | 1 | 0 | 373.0 | 345 | 166 | 28 | 122 | 322 |
| Gene Olander | 1909-1917 | 21 | 52 | .288 | 4.98 | 167 | 123 | 1 | 1 | 6 | 667.0 | 782 | 369 | 69 | 222 | 414 |
| Bob Oliver | 1915-1915 | 1 | 3 | .250 | 8.20 | 5 | 5 | 0 | 0 | 0 | 26.1 | 27 | 24 | 8 | 17 | 23 |
| Ed Oliver | 1922-1923 | 15 | 18 | .455 | 4.33 | 53 | 40 | 1 | 0 | 1 | 266.0 | 245 | 128 | 15 | 158 | 180 |
| Johnny Ormsby | 1912-1912 | 0 | 0 | .000 | 9.53 | 2 | 2 | 0 | 0 | 0 | 11.1 | 12 | 12 | 5 | 7 | 10 |
| Don Orr | 1939-1943 | 5 | 5 | .500 | 1.98 | 51 | 0 | 0 | 0 | 4 | 77.1 | 56 | 17 | 2 | 33 | 59 |
| Pete Orr | 1920-1931 | 95 | 91 | .511 | 3.66 | 346 | 247 | 9 | 2 | 16 | 1764.1 | 1697 | 717 | 95 | 580 | 1519 |
| Johnny Ortiz | 1908-1908 | 1 | 0 | 1.000 | 4.50 | 1 | 1 | 0 | 0 | 0 | 6.0 | 5 | 3 | 2 | 3 | 9 |
| Bobby Osley | 1904-1906 | 18 | 34 | .346 | 5.01 | 72 | 59 | 21 | 1 | 3 | 434.2 | 534 | 242 | 29 | 133 | 123 |
| Rudy Osmond | 1917-1927 | 21 | 16 | .568 | 4.18 | 69 | 42 | 2 | 0 | 1 | 320.2 | 341 | 149 | 20 | 144 | 216 |
| Frank Owens | 1941-1942 | 1 | 1 | .500 | 2.42 | 13 | 0 | 0 | 0 | 0 | 26.0 | 26 | 7 | 1 | 14 | 13 |
| Ken Owens | 1946-1947 | 0 | 4 | .000 | 4.03 | 39 | 2 | 0 | 0 | 1 | 76.0 | 69 | 34 | 0 | 29 | 28 |
| John Ozga | 1909-1909 | 7 | 8 | .467 | 2.65 | 57 | 0 | 0 | 0 | 16 | 105.1 | 106 | 31 | 0 | 32 | 22 |
