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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 |
|---|---|---|---|---|---|---|---|---|---|
| Patrick O'Keefe | 1974-1978 | .206 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Malley | 1981-1981 | .252 | 8 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Raymond O'Neill | 1971-1971 | .000 | 0 | 0 | 5 | 9 | 0 | 6.28 | 55 |
| Don O'Riley | 1969-1971 | .133 | 0 | 1 | 29 | 31 | 0 | 4.24 | 247 |
| Evan O'Rourke | 1976-1978 | .000 | 0 | 0 | 19 | 28 | 6 | 4.05 | 280 |
| Jim P O'Rourke | 1959-1962 | .248 | 12 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Oberkfell | 1978-1978 | .202 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Obregon | 1960-1968 | .223 | 1 | 24 | 0 | 0 | 2 | 5.57 | 13 |
| Dave Odom | 1944-1945 | .200 | 0 | 2 | 2 | 4 | 3 | 5.93 | 45 |
| Maurice Ogier | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 5.06 | 2 |
| Ron Oglesby | 1972-1974 | .000 | 0 | 0 | 19 | 12 | 2 | 4.07 | 155 |
| Bob Oldis | 1957-1959 | .294 | 6 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| John Olerud | 1970-1970 | .252 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olivares | 1959-1959 | .182 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Oliver | 1968-1969 | .288 | 20 | 94 | 0 | 0 | 0 | 9.00 | 0 |
| Dave Oliver | 1974-1978 | .242 | 1 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Oliver | 1960-1960 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Chi-Chi Olivo | 1955-1963 | .295 | 0 | 12 | 17 | 14 | 5 | 4.52 | 181 |
| Mike Olivo | 1969-1970 | .100 | 0 | 2 | 8 | 19 | 0 | 5.30 | 97 |
| Jim Ollom | 1965-1969 | .100 | 0 | 7 | 24 | 21 | 2 | 4.29 | 214 |
| Barney Olsen | 1940-1949 | .277 | 16 | 179 | 0 | 0 | 0 | 0.00 | 0 |
| Lew Olsen | 1976-1978 | .000 | 0 | 0 | 22 | 18 | 7 | 4.04 | 184 |
| Vern Olsen | 1947-1947 | .250 | 0 | 1 | 0 | 0 | 0 | 9.00 | 2 |
| Dean Olson | 1977-1977 | .000 | 0 | 0 | 0 | 1 | 0 | 13.50 | 5 |
| Eddie Olson | 1972-1974 | .248 | 6 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Karl Olson | 1957-1957 | .169 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Oppenheimer | 1981-1981 | .045 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Oquendo | 1981-1981 | .233 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orengo | 1943-1943 | .286 | 5 | 25 | 0 | 0 | 0 | 5.14 | 4 |
| Curt Oriani | 1974-1978 | .254 | 2 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Edward Orick | 1980-1980 | .000 | 0 | 0 | 4 | 3 | 0 | 4.63 | 43 |
| Jesse Orosco | 1979-1980 | .000 | 0 | 0 | 4 | 2 | 10 | 4.50 | 19 |
| Marcos Ortega | 1975-1976 | .000 | 0 | 0 | 9 | 3 | 0 | 1.93 | 92 |
| Frank Ortenzio | 1970-1976 | .263 | 60 | 196 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 1978-1978 | .000 | 0 | 0 | 0 | 0 | 0 | 3.00 | 3 |
| Ozzie Osborn | 1970-1973 | .000 | 0 | 0 | 15 | 23 | 1 | 4.79 | 164 |
| Bobo Osborne | 1957-1969 | .284 | 113 | 468 | 1 | 0 | 0 | 4.63 | 6 |
| Richard Osentowski | 1972-1973 | .203 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Darrell Osteen | 1970-1970 | .000 | 0 | 0 | 8 | 2 | 0 | 3.98 | 58 |
| Johnny Ostrowski | 1945-1945 | .297 | 13 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Amos Otis | 1971-1971 | .316 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Owchinko | 1977-1978 | .000 | 0 | 0 | 5 | 1 | 5 | 2.44 | 33 |
| Mickey Owen | 1952-1952 | .237 | 3 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Owens | 1966-1966 | .167 | 0 | 1 | 0 | 0 | 1 | 9.00 | 5 |
| John Owens | 1972-1977 | .181 | 29 | 123 | 0 | 1 | 0 | 4.91 | 0 |
| Ray Oyler | 1970-1970 | .205 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
