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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bob O'Brien | 1970-1975 | 3 | 6 | .333 | 2.90 | 19 | 10 | 3 | 0 | 0 | 83.2 | 73 | 27 | 9 | 24 | 66 |
| Kenneth O'Brien | 1975-1976 | 7 | 9 | .438 | 4.96 | 62 | 0 | 0 | 0 | 10 | 90.2 | 90 | 50 | 10 | 60 | 69 |
| Steven O'Brien | 1972-1972 | 0 | 0 | .000 | 4.17 | 21 | 0 | 0 | 0 | 1 | 45.1 | 43 | 21 | 2 | 23 | 38 |
| John E O'Donoghue | 1962-1962 | 7 | 11 | .389 | 5.09 | 32 | 28 | 6 | 0 | 1 | 182.0 | 211 | 103 | 18 | 84 | 133 |
| Emmett O'Neill | 1950-1950 | 2 | 3 | .400 | 4.91 | 10 | 8 | 3 | 1 | 0 | 55.0 | 61 | 30 | 6 | 44 | 31 |
| Theodore O'Neill | 1979-1979 | 8 | 4 | .667 | 3.41 | 14 | 14 | 3 | 2 | 0 | 97.2 | 68 | 37 | 5 | 46 | 49 |
| Timothy O'Neill | 1980-1980 | 0 | 0 | .000 | 1.78 | 12 | 0 | 0 | 0 | 1 | 25.1 | 16 | 5 | 2 | 7 | 20 |
| John O'Rear | 1972-1978 | 1 | 0 | 1.000 | 10.13 | 2 | 0 | 0 | 0 | 0 | 2.2 | 7 | 3 | 0 | 2 | 0 |
| Prince Oana | 1940-1947 | 61 | 30 | .670 | 2.75 | 129 | 96 | 46 | 21 | 6 | 828.0 | 744 | 253 | 36 | 274 | 452 |
| Chuck Oertel | 1954-1957 | 0 | 0 | .000 | 4.50 | 4 | 0 | 0 | 0 | 0 | 8.0 | 12 | 4 | 0 | 4 | 4 |
| John Ogden | 1977-1979 | 9 | 4 | .692 | 4.11 | 85 | 0 | 0 | 0 | 0 | 144.2 | 123 | 66 | 19 | 80 | 123 |
| Maurice Ogier | 1969-1969 | 3 | 2 | .600 | 3.79 | 14 | 10 | 1 | 1 | 0 | 57.0 | 61 | 24 | 1 | 31 | 34 |
| Bob Ojeda | 1980-1980 | 5 | 3 | .625 | 2.66 | 11 | 11 | 5 | 2 | 0 | 84.2 | 64 | 25 | 4 | 32 | 50 |
| Oswaldo Olivares | 1973-1976 | 0 | 0 | .000 | 15.43 | 2 | 0 | 0 | 0 | 0 | 2.1 | 4 | 4 | 1 | 2 | 5 |
| Chi-Chi Olivo | 1956-1960 | 14 | 12 | .538 | 3.19 | 58 | 20 | 9 | 0 | 10 | 200.0 | 186 | 71 | 17 | 55 | 111 |
| Mitchell Olson | 1973-1975 | 1 | 1 | .500 | 3.15 | 13 | 0 | 0 | 0 | 4 | 20.0 | 15 | 7 | 1 | 10 | 22 |
| Edward Orick | 1978-1981 | 25 | 29 | .463 | 3.95 | 79 | 76 | 3 | 3 | 0 | 504.0 | 442 | 221 | 49 | 201 | 292 |
| Alex Orozco | 1981-1981 | 0 | 1 | .000 | 3.24 | 2 | 1 | 1 | 0 | 0 | 8.1 | 5 | 3 | 0 | 5 | 6 |
| Joe Orrell | 1946-1948 | 17 | 20 | .459 | 3.24 | 59 | 39 | 15 | 6 | 5 | 322.0 | 285 | 116 | 22 | 115 | 158 |
| Nelson Ortiz | 1980-1981 | 11 | 6 | .647 | 5.03 | 30 | 19 | 6 | 0 | 4 | 166.1 | 163 | 93 | 22 | 67 | 115 |
| Ozzie Osborn | 1975-1975 | 6 | 15 | .286 | 4.88 | 26 | 26 | 5 | 1 | 0 | 171.2 | 195 | 93 | 14 | 78 | 83 |
| Stubby Overmire | 1942-1942 | 14 | 11 | .560 | 2.69 | 31 | 26 | 12 | 5 | 2 | 204.0 | 192 | 61 | 7 | 47 | 77 |
| Madison Owens | 1980-1980 | 7 | 13 | .350 | 5.62 | 25 | 25 | 1 | 0 | 0 | 157.0 | 167 | 98 | 22 | 97 | 80 |
