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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 | 1974-1975 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kenneth O'Brien | 1974-1975 | .237 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Steven O'Brien | 1971-1971 | .000 | 0 | 0 | 11 | 2 | 0 | 2.21 | 91 |
| Curt O'Connor | 1981-1981 | .203 | 7 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| J.P. O'Connor | 1977-1977 | .108 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jack W O'Connor | 1978-1978 | .000 | 0 | 0 | 0 | 1 | 0 | 3.38 | 8 |
| Robert O'Connor | 1981-1981 | .235 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Thomas O'Donnell | 1972-1976 | .000 | 0 | 0 | 2 | 1 | 0 | 6.92 | 26 |
| Joseph O'Malley | 1978-1978 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jared O'Nan | 1971-1971 | .241 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick O'Neill | 1971-1973 | .138 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Timothy O'Neill | 1977-1977 | .000 | 0 | 0 | 1 | 1 | 2 | 1.42 | 6 |
| Michael O'Reilly | 1977-1980 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Shane O'Shea | 1980-1981 | .152 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Denny O'Toole | 1967-1967 | .333 | 0 | 1 | 2 | 1 | 1 | 3.46 | 19 |
| Ken Oberkfell | 1974-1974 | .429 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Obradovich | 1967-1967 | .169 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Ochoa | 1974-1974 | .286 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Oestreich | 1976-1976 | .228 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Rowland Office | 1975-1977 | .219 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Officer | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 12 |
| Ron Oglesby | 1968-1968 | .091 | 0 | 1 | 8 | 3 | 0 | 2.66 | 59 |
| Jim Olander | 1980-1981 | .263 | 10 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Oleinik | 1977-1977 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Oliva | 1981-1981 | .240 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ivan Oliva | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Oliva | 1973-1979 | .203 | 2 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Olivas | 1976-1978 | .225 | 4 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Donald Oliver | 1980-1981 | .000 | 0 | 0 | 1 | 1 | 0 | 2.55 | 17 |
| Richard Oliver | 1976-1977 | .224 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Steven Oliver | 1977-1981 | .000 | 0 | 0 | 2 | 4 | 5 | 4.71 | 25 |
| Max Oliveras | 1974-1974 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Al Olmsted | 1975-1978 | .000 | 0 | 0 | 22 | 19 | 0 | 3.70 | 222 |
| Rich Olsen | 1978-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 1.84 | 15 |
| Eddie Olson | 1972-1972 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Olson | 1975-1975 | .189 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Terry Olson | 1977-1980 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olwine | 1979-1981 | .000 | 0 | 0 | 5 | 9 | 7 | 6.75 | 50 |
| Robert Omo | 1977-1977 | .000 | 0 | 0 | 6 | 4 | 0 | 2.95 | 94 |
| Jose Oppenheimer | 1975-1978 | .218 | 5 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Sal Orellana | 1976-1978 | .206 | 3 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Ornest | 1976-1976 | .212 | 8 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orona | 1974-1979 | .226 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Boyce Orosco | 1980-1981 | .000 | 0 | 0 | 5 | 6 | 2 | 3.97 | 73 |
| Mike Orozco | 1971-1971 | .258 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Orrego | 1974-1975 | .000 | 0 | 0 | 1 | 1 | 0 | 6.57 | 14 |
| Marcos Ortega | 1971-1971 | .000 | 0 | 0 | 5 | 1 | 0 | 3.14 | 41 |
| Alex Ortiz | 1977-1978 | .247 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Ortiz | 1981-1981 | .000 | 0 | 0 | 4 | 4 | 0 | 5.10 | 61 |
| Hector Ortiz | 1974-1974 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jose L Ortiz | 1966-1970 | .302 | 1 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Junior Ortiz | 1976-1976 | .198 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortiz | 1979-1979 | .000 | 0 | 0 | 0 | 0 | 1 | 1.23 | 11 |
| Nelson Ortiz | 1972-1972 | .000 | 0 | 0 | 1 | 0 | 0 | 1.98 | 12 |
| Osvaldo Ortiz | 1972-1974 | .209 | 13 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Reyes Ortiz | 1968-1968 | .290 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jeffrey Orville | 1977-1978 | .000 | 0 | 0 | 3 | 3 | 5 | 3.03 | 29 |
| Ozzie Osborn | 1968-1968 | .250 | 1 | 9 | 1 | 0 | 1 | 0.00 | 7 |
| Bob Osentoski | 1973-1973 | .275 | 10 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Osentowski | 1969-1969 | .264 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Alan Osmundsen | 1972-1974 | .217 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Alan Owens | 1977-1979 | .000 | 0 | 0 | 0 | 0 | 0 | 6.97 | 4 |
| Andy Owings | 1979-1980 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Ownbey | 1979-1979 | .000 | 0 | 0 | 1 | 0 | 1 | 5.40 | 6 |
| Stanley Oxner | 1981-1981 | .333 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Ozoria | 1979-1981 | .145 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
