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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dan O'Brien | 1977-1977 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 1 |
| Joseph O'Brien | 1972-1976 | .114 | 0 | 1 | 1 | 2 | 2 | 7.00 | 19 |
| Kenneth O'Brien | 1970-1970 | .000 | 0 | 0 | 2 | 1 | 0 | 2.95 | 17 |
| Patrick O'Brien | 1976-1977 | .188 | 0 | 2 | 0 | 0 | 0 | 9.95 | 7 |
| Robert O'Brien | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steven O'Brien | 1975-1975 | .000 | 0 | 0 | 1 | 0 | 0 | 1.00 | 12 |
| Syd O'Brien | 1965-1965 | .265 | 12 | 61 | 0 | 0 | 0 | 63.00 | 0 |
| Thomas O'Brien | 1974-1974 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| J.P. O'Connor | 1978-1980 | .303 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| John E O'Donoghue | 1960-1961 | .300 | 1 | 9 | 14 | 17 | 0 | 5.77 | 134 |
| Robert O'Leath | 1979-1979 | .279 | 6 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Regan | 1981-1981 | .279 | 3 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Shea | 1975-1975 | .000 | 0 | 0 | 2 | 3 | 1 | 4.01 | 27 |
| David Obal | 1972-1975 | .269 | 3 | 25 | 6 | 16 | 1 | 8.66 | 9 |
| Mark Obal | 1977-1978 | .091 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Benjamin Ochoa | 1973-1973 | .000 | 0 | 0 | 3 | 5 | 12 | 2.27 | 51 |
| Rick Odekirk | 1979-1981 | .000 | 0 | 0 | 2 | 4 | 1 | 8.85 | 27 |
| Raymie Odermott | 1977-1979 | .000 | 0 | 0 | 4 | 0 | 0 | 1.96 | 24 |
| Blue Moon Odom | 1965-1965 | .186 | 2 | 9 | 11 | 14 | 0 | 4.27 | 184 |
| Mark Oestreich | 1976-1980 | .270 | 36 | 160 | 0 | 0 | 0 | 0.00 | 0 |
| Oswaldo Olivares | 1972-1972 | .353 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Oliver | 1970-1970 | .362 | 1 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olivo | 1965-1966 | .000 | 0 | 0 | 4 | 4 | 1 | 2.42 | 50 |
| Al Olmsted | 1977-1978 | .000 | 0 | 0 | 5 | 0 | 0 | 1.99 | 29 |
| Blake Olsen | 1970-1975 | .286 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Olsen | 1981-1981 | .000 | 0 | 0 | 1 | 1 | 0 | 3.24 | 6 |
| Larry Olson | 1976-1977 | .280 | 8 | 46 | 0 | 1 | 0 | 16.36 | 4 |
| Martin Olson | 1966-1972 | .222 | 13 | 61 | 0 | 0 | 0 | 9.00 | 4 |
| Thomas Olszak | 1978-1978 | .221 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ondina | 1971-1976 | .282 | 13 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jim Opie | 1981-1981 | .287 | 11 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Oquendo | 1978-1978 | .214 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Orick | 1975-1977 | .000 | 0 | 0 | 15 | 7 | 1 | 4.72 | 74 |
| Paul Orlowski | 1970-1974 | .283 | 10 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Orozco | 1973-1974 | .259 | 3 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orrell | 1954-1955 | .193 | 0 | 10 | 17 | 9 | 1 | 4.22 | 105 |
| Shawn Orsini | 1971-1972 | .000 | 0 | 0 | 1 | 1 | 0 | 7.24 | 6 |
| Daniel Ortega | 1978-1978 | .000 | 0 | 0 | 0 | 0 | 0 | 6.85 | 17 |
| Kirk Ortega | 1978-1979 | .241 | 2 | 12 | 0 | 0 | 0 | 6.75 | 4 |
| Ray Ortega | 1981-1981 | .297 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Albert Ortiz | 1977-1978 | .282 | 1 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Alexander Ortiz | 1977-1977 | .212 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Edwin Ortiz | 1981-1981 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 1972-1972 | .000 | 0 | 0 | 1 | 0 | 0 | 2.08 | 5 |
| Nestor Ortiz | 1972-1973 | .000 | 0 | 0 | 0 | 0 | 0 | 5.63 | 5 |
| Reyes Ortiz | 1971-1972 | .269 | 10 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Ortiz | 1974-1974 | .375 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Osmanski | 1975-1975 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| David Otersen | 1979-1981 | .170 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Overy | 1974-1975 | .000 | 0 | 0 | 4 | 0 | 11 | 1.38 | 34 |
| Spike Owen | 1981-1981 | .240 | 6 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Alan Owens | 1977-1980 | .000 | 0 | 0 | 2 | 1 | 1 | 4.31 | 49 |
| Madison Owens | 1977-1977 | .000 | 0 | 0 | 2 | 2 | 0 | 5.52 | 27 |
| Tom Owens | 1977-1977 | .000 | 0 | 0 | 6 | 2 | 0 | 3.71 | 46 |
| Andy Owings | 1978-1981 | .228 | 8 | 34 | 0 | 0 | 0 | 0.00 | 0 |
