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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 | 18 | 6 | 1 | 3.32 | 220 |
| Dan O'Brien | 1977-1979 | .000 | 0 | 0 | 1 | 2 | 5 | 2.20 | 13 |
| Eddie O'Brien | 1957-1958 | .222 | 0 | 13 | 9 | 11 | 4 | 4.29 | 81 |
| Johnny O'Brien | 1960-1960 | .309 | 5 | 30 | 0 | 0 | 0 | 4.50 | 5 |
| Tommy O'Brien | 1946-1946 | .276 | 17 | 73 | 0 | 0 | 1 | 4.50 | 1 |
| George O'Donnell | 1953-1960 | .104 | 0 | 6 | 56 | 38 | 47 | 3.37 | 232 |
| John E O'Donoghue | 1963-1970 | .200 | 0 | 0 | 3 | 5 | 3 | 3.44 | 25 |
| Tim O'Hara | 1974-1979 | .236 | 23 | 212 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neil | 1943-1953 | .257 | 0 | 443 | 0 | 0 | 0 | 4.50 | 96 |
| Emmett O'Neill | 1946-1948 | .143 | 2 | 2 | 0 | 2 | 4 | 4.64 | 30 |
| Jerry O'Neill | 1980-1981 | .000 | 0 | 0 | 17 | 7 | 0 | 3.23 | 232 |
| Paul O'Neill | 1981-1981 | .250 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Don O'Riley | 1968-1968 | .250 | 0 | 1 | 4 | 5 | 11 | 3.26 | 64 |
| Jim O'Toole | 1968-1968 | .000 | 0 | 0 | 2 | 8 | 0 | 5.53 | 39 |
| Francisco Obregon | 1960-1960 | .243 | 0 | 13 | 0 | 0 | 1 | 5.63 | 5 |
| Benjamin Ochoa | 1971-1972 | .000 | 0 | 0 | 12 | 3 | 0 | 2.47 | 135 |
| Blue Moon Odom | 1967-1980 | .286 | 0 | 0 | 5 | 2 | 0 | 2.89 | 56 |
| Dennis Odom | 1971-1973 | .224 | 25 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Chuck Oertel | 1956-1960 | .311 | 2 | 47 | 1 | 0 | 0 | 4.50 | 2 |
| John Ogden | 1979-1980 | .000 | 0 | 0 | 0 | 2 | 1 | 7.31 | 15 |
| Bruce Ogrodowski | 1940-1947 | .266 | 2 | 227 | 0 | 0 | 0 | 0.00 | 0 |
| John Olerud | 1965-1968 | .193 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oliva | 1963-1963 | .304 | 23 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Oswaldo Olivares | 1976-1980 | .223 | 7 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Oliver | 1974-1974 | .250 | 15 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Gene Oliver | 1961-1961 | .302 | 36 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Oliver | 1961-1970 | .286 | 30 | 199 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Oliver | 1970-1974 | .242 | 31 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olivo | 1968-1968 | .000 | 0 | 0 | 1 | 6 | 0 | 4.17 | 20 |
| Al Olmsted | 1981-1981 | .000 | 0 | 0 | 1 | 0 | 0 | 3.97 | 40 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Barney Olsen | 1942-1946 | .291 | 18 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olszta | 1976-1979 | .162 | 12 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Steve R Ontiveros | 1970-1970 | .344 | 10 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Oquendo | 1980-1980 | .217 | 6 | 29 | 0 | 0 | 0 | 6.75 | 0 |
| Jose Oquendo | 1980-1981 | .239 | 5 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Ernie Oravetz | 1961-1961 | .287 | 1 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orengo | 1946-1946 | .293 | 9 | 43 | 1 | 0 | 0 | 5.40 | 6 |
| Paul Orlowski | 1980-1980 | .111 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| James Oros | 1979-1980 | .222 | 20 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orrell | 1940-1948 | .086 | 0 | 10 | 32 | 61 | 6 | 4.04 | 378 |
| John Orsino | 1959-1969 | .279 | 36 | 161 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Ortega | 1959-1970 | .233 | 2 | 14 | 35 | 40 | 2 | 4.67 | 419 |
| Jordan Ortiz | 1979-1980 | .000 | 0 | 0 | 1 | 5 | 34 | 3.74 | 58 |
| Jose L Ortiz | 1968-1969 | .275 | 0 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Monte Ortiz | 1974-1975 | .145 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 1974-1974 | .000 | 0 | 0 | 1 | 2 | 0 | 4.58 | 21 |
| Wayne Osborne | 1940-1943 | .241 | 2 | 38 | 59 | 62 | 8 | 4.38 | 268 |
| Joe Ostrowski | 1953-1953 | .056 | 0 | 0 | 3 | 6 | 6 | 2.27 | 16 |
| Johnny Ostrowski | 1943-1952 | .283 | 146 | 543 | 0 | 0 | 0 | 0.00 | 0 |
| Reggie Otero | 1944-1947 | .299 | 1 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Ott | 1963-1964 | .240 | 12 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy Outlaw | 1949-1949 | .105 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Owchinko | 1980-1981 | .000 | 0 | 0 | 6 | 3 | 4 | 2.87 | 28 |
| Marv Owen | 1941-1946 | .296 | 6 | 319 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Owens | 1980-1980 | .000 | 0 | 0 | 5 | 4 | 0 | 2.95 | 64 |
