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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Mike O'Berry | 1976-1977 | .215 | 4 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Pete M O'Brien | 1978-1978 | .250 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel O'Connor | 1977-1977 | .364 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Nicholas O'Connor | 1979-1981 | .000 | 0 | 0 | 1 | 0 | 0 | 3.23 | 15 |
| Thomas O'Connor | 1969-1969 | .385 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Thomas O'Donnell | 1971-1971 | .000 | 0 | 0 | 1 | 1 | 0 | 0.89 | 13 |
| Patrick O'Hara | 1980-1981 | .200 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick O'Keefe | 1968-1968 | .234 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Rick O'Keeffe | 1974-1975 | .000 | 0 | 0 | 3 | 1 | 0 | 2.95 | 31 |
| Tom O'Malley | 1978-1980 | .301 | 4 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neil | 1940-1940 | .265 | 0 | 24 | 0 | 0 | 0 | 4.50 | 8 |
| John O'Rear | 1971-1971 | .229 | 6 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Shea | 1972-1972 | .000 | 0 | 0 | 2 | 0 | 1 | 5.84 | 11 |
| Johnny Oates | 1967-1967 | .417 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Len Okrie | 1954-1954 | .319 | 1 | 10 | 0 | 1 | 0 | 4.20 | 9 |
| Tony Oliva | 1961-1961 | .410 | 10 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Bailey Oliver | 1974-1974 | .133 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Oliveri | 1974-1977 | .143 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Olivero | 1977-1980 | .241 | 4 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Ollom | 1963-1963 | .036 | 0 | 0 | 7 | 5 | 0 | 3.51 | 100 |
| Rich Olsen | 1977-1980 | .000 | 0 | 0 | 6 | 2 | 0 | 2.04 | 43 |
| Bruce Olson | 1968-1968 | .080 | 0 | 0 | 8 | 3 | 0 | 1.84 | 61 |
| Mitchell Olson | 1980-1981 | .214 | 1 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Mitchell Olson | 1969-1969 | .091 | 0 | 0 | 3 | 2 | 2 | 4.71 | 49 |
| Terry Olson | 1974-1978 | .300 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Ondo | 1979-1979 | .136 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Ongarato | 1975-1975 | .348 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Oppenheimer | 1977-1978 | .270 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Orlich | 1979-1981 | .000 | 0 | 0 | 3 | 0 | 0 | 1.70 | 27 |
| Robert Ormond | 1969-1969 | .316 | 0 | 0 | 5 | 2 | 0 | 4.06 | 58 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Alex Orozco | 1979-1979 | .000 | 0 | 0 | 2 | 6 | 0 | 5.70 | 42 |
| Washington Orozco | 1969-1970 | .153 | 0 | 4 | 0 | 0 | 1 | 45.00 | 1 |
| Seth Orr | 1971-1971 | .000 | 0 | 0 | 0 | 1 | 0 | 7.50 | 2 |
| Joe Orsulak | 1980-1980 | .196 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ortega | 1976-1976 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Albert Ortiz | 1979-1979 | .276 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortiz | 1979-1980 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 1976-1976 | .667 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortiz | 1981-1981 | .318 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 1970-1970 | .000 | 0 | 0 | 1 | 0 | 0 | 4.50 | 1 |
| Raul Ortiz | 1979-1980 | .000 | 0 | 0 | 15 | 5 | 0 | 2.39 | 175 |
| Steven Osborne | 1974-1978 | .333 | 2 | 2 | 0 | 1 | 0 | 5.56 | 2 |
| Matt Osmanski | 1972-1972 | .000 | 0 | 0 | 2 | 2 | 6 | 6.62 | 6 |
| Frank Osmulski | 1978-1978 | .118 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Alvin Osofsky | 1974-1975 | .273 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Ostrow | 1978-1979 | .000 | 0 | 0 | 1 | 0 | 1 | 3.18 | 8 |
| Amos Otis | 1965-1965 | .329 | 9 | 39 | 0 | 0 | 0 | 0.00 | 1 |
| Robert Ott | 1971-1972 | .000 | 0 | 0 | 1 | 2 | 0 | 2.23 | 36 |
| Jim Otten | 1972-1972 | .000 | 0 | 0 | 1 | 1 | 0 | 7.30 | 10 |
| James Otto | 1971-1971 | .360 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| James Owen | 1973-1975 | .000 | 0 | 0 | 20 | 11 | 0 | 3.16 | 153 |
| Jim Owens | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
