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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Timothy O'Connell | 1968-1971 | 0 | 0 | .000 | 1.50 | 2 | 0 | 0 | 0 | 0 | 6.0 | 3 | 1 | 0 | 4 | 4 |
| Paul O'Dea | 1941-1941 | 1 | 1 | .500 | 4.22 | 9 | 5 | 2 | 0 | 0 | 32.0 | 36 | 15 | 1 | 19 | 19 |
| John E O'Donoghue | 1963-1963 | 12 | 11 | .522 | 3.26 | 29 | 23 | 13 | 1 | 1 | 171.0 | 183 | 62 | 7 | 60 | 113 |
| Jerry O'Neill | 1970-1977 | 0 | 1 | .000 | 2.01 | 24 | 0 | 0 | 0 | 5 | 31.1 | 29 | 7 | 3 | 24 | 28 |
| Walter Ockey | 1945-1945 | 2 | 4 | .333 | 4.26 | 9 | 7 | 3 | 1 | 0 | 57.0 | 60 | 27 | 4 | 32 | 14 |
| Raymie Odermott | 1980-1981 | 15 | 10 | .600 | 2.79 | 33 | 22 | 19 | 2 | 1 | 219.2 | 193 | 68 | 19 | 60 | 120 |
| Dave Odom | 1944-1944 | 4 | 3 | .571 | 3.66 | 11 | 10 | 5 | 2 | 0 | 64.0 | 56 | 26 | 3 | 50 | 33 |
| Jim Officer | 1975-1976 | 21 | 6 | .778 | 2.37 | 40 | 39 | 8 | 1 | 0 | 281.0 | 206 | 74 | 22 | 143 | 306 |
| Len Okrie | 1953-1953 | 0 | 1 | .000 | 4.20 | 1 | 1 | 0 | 0 | 0 | 15.0 | 16 | 7 | 2 | 6 | 9 |
| Lew Olsen | 1975-1975 | 12 | 8 | .600 | 3.26 | 23 | 23 | 16 | 2 | 0 | 193.0 | 173 | 70 | 18 | 53 | 113 |
| Clinton Olson | 1972-1974 | 7 | 6 | .538 | 3.60 | 60 | 0 | 0 | 0 | 11 | 105.0 | 113 | 42 | 11 | 48 | 68 |
| Robert Omo | 1978-1978 | 6 | 11 | .353 | 4.02 | 26 | 26 | 5 | 0 | 0 | 183.2 | 166 | 82 | 12 | 107 | 110 |
| Richard Ordway | 1967-1969 | 8 | 12 | .400 | 4.24 | 75 | 11 | 5 | 0 | 17 | 191.0 | 192 | 90 | 20 | 117 | 111 |
| Robert Ormond | 1970-1971 | 12 | 21 | .364 | 4.97 | 61 | 61 | 2 | 0 | 0 | 364.0 | 400 | 201 | 48 | 163 | 247 |
| Jesse Orosco | 1979-1979 | 3 | 0 | 1.000 | 3.18 | 15 | 0 | 0 | 0 | 3 | 22.2 | 14 | 8 | 0 | 14 | 22 |
| Seth Orr | 1978-1979 | 23 | 11 | .676 | 3.29 | 53 | 53 | 1 | 1 | 0 | 290.1 | 255 | 106 | 28 | 63 | 187 |
| Tony Orrego | 1975-1980 | 1 | 3 | .250 | 4.58 | 56 | 0 | 0 | 0 | 4 | 125.2 | 122 | 64 | 15 | 74 | 58 |
| Jordan Ortiz | 1977-1978 | 5 | 6 | .455 | 2.66 | 71 | 2 | 0 | 0 | 20 | 115.0 | 89 | 34 | 10 | 48 | 114 |
| Jeffrey Orville | 1979-1981 | 13 | 17 | .433 | 4.62 | 48 | 35 | 5 | 0 | 0 | 282.1 | 298 | 145 | 28 | 129 | 138 |
| William Osborne | 1970-1975 | 18 | 22 | .450 | 5.76 | 172 | 1 | 0 | 0 | 30 | 317.0 | 360 | 203 | 44 | 206 | 199 |
| Mike Overy | 1972-1980 | 26 | 36 | .419 | 5.26 | 227 | 24 | 1 | 1 | 39 | 412.0 | 411 | 241 | 35 | 296 | 382 |
| James Owen | 1976-1976 | 1 | 0 | 1.000 | 6.27 | 14 | 0 | 0 | 0 | 0 | 18.2 | 17 | 13 | 2 | 16 | 12 |
