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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bob O'Brien | 1970-1975 | .000 | 0 | 0 | 3 | 6 | 0 | 2.90 | 66 |
| Kenneth O'Brien | 1975-1976 | .000 | 0 | 0 | 7 | 9 | 10 | 4.96 | 69 |
| Larry O'Brien | 1973-1976 | .226 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Steven O'Brien | 1972-1972 | .000 | 0 | 0 | 0 | 0 | 1 | 4.17 | 38 |
| William O'Connor | 1970-1971 | .260 | 23 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Richard O'Daniels | 1973-1976 | .230 | 14 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| John E O'Donoghue | 1962-1962 | .127 | 1 | 6 | 7 | 11 | 1 | 5.09 | 133 |
| Tim O'Hara | 1978-1978 | .333 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Emmett O'Neill | 1950-1950 | .222 | 0 | 2 | 2 | 3 | 0 | 4.91 | 31 |
| Theodore O'Neill | 1979-1979 | .000 | 0 | 0 | 8 | 4 | 0 | 3.41 | 49 |
| Timothy O'Neill | 1980-1980 | .000 | 0 | 0 | 0 | 0 | 1 | 1.78 | 20 |
| John O'Rear | 1972-1978 | .235 | 26 | 153 | 1 | 0 | 0 | 10.13 | 0 |
| Prince Oana | 1940-1947 | .260 | 32 | 184 | 61 | 30 | 6 | 2.75 | 452 |
| Johnny Oates | 1969-1970 | .296 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| David Obal | 1974-1974 | .222 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Obermeier | 1972-1972 | .224 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Chuck Oertel | 1954-1957 | .284 | 33 | 183 | 0 | 0 | 0 | 4.50 | 4 |
| Rowland Office | 1970-1973 | .253 | 28 | 159 | 0 | 0 | 0 | 0.00 | 0 |
| John Ogden | 1977-1979 | .000 | 0 | 0 | 9 | 4 | 0 | 4.11 | 123 |
| Maurice Ogier | 1969-1969 | .333 | 0 | 0 | 3 | 2 | 0 | 3.79 | 34 |
| Bob Ojeda | 1980-1980 | .000 | 0 | 0 | 5 | 3 | 0 | 2.66 | 50 |
| John Olerud | 1965-1969 | .273 | 7 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olivares | 1963-1963 | .292 | 23 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Oswaldo Olivares | 1973-1976 | .196 | 14 | 70 | 0 | 0 | 0 | 15.43 | 5 |
| Gene Oliver | 1969-1969 | .259 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Oliver | 1970-1970 | .667 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Oliver | 1974-1974 | .297 | 2 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Chi-Chi Olivo | 1956-1960 | .203 | 0 | 3 | 14 | 12 | 10 | 3.19 | 111 |
| Barney Olsen | 1949-1949 | .256 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Mitchell Olson | 1973-1975 | .000 | 0 | 0 | 1 | 1 | 4 | 3.15 | 22 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Steve R Ontiveros | 1970-1970 | .385 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Oquendo | 1979-1979 | .246 | 2 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Orick | 1978-1981 | .000 | 0 | 0 | 25 | 29 | 0 | 3.95 | 292 |
| Paul Orlowski | 1974-1974 | .308 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Maury Ornest | 1980-1980 | .185 | 10 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| James Oros | 1979-1981 | .216 | 23 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Orozco | 1981-1981 | .000 | 0 | 0 | 0 | 1 | 0 | 3.24 | 6 |
| Joe Orrell | 1946-1948 | .155 | 0 | 6 | 17 | 20 | 5 | 3.24 | 158 |
| John Orsino | 1960-1960 | .296 | 21 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Ortenzio | 1979-1979 | .237 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortiz | 1980-1980 | .199 | 2 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortiz | 1980-1980 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Monte Ortiz | 1974-1975 | .193 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 1980-1981 | .000 | 0 | 0 | 11 | 6 | 4 | 5.03 | 115 |
| Ozzie Osborn | 1975-1975 | .000 | 0 | 0 | 6 | 15 | 0 | 4.88 | 83 |
| Brian Ostrosser | 1971-1974 | .214 | 10 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Ott | 1962-1962 | .281 | 23 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Stubby Overmire | 1942-1942 | .164 | 0 | 6 | 14 | 11 | 2 | 2.69 | 77 |
| Madison Owens | 1980-1980 | .000 | 0 | 0 | 7 | 13 | 0 | 5.62 | 80 |
