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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 |
|---|---|---|---|---|---|---|---|---|---|
| Charlie O'Brien | 1985-1991 | .169 | 24 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Brien | 1978-1981 | .000 | 0 | 0 | 8 | 7 | 1 | 3.01 | 85 |
| Pete O'Brien | 1982-1992 | .247 | 154 | 599 | 0 | 0 | 0 | 0.00 | 0 |
| Greg O'Halloran | 1994-1994 | .155 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Troy O'Leary | 1993-1994 | .226 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Malley | 1987-1990 | .250 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Randy O'Neal | 1985-1993 | .000 | 0 | 0 | 34 | 29 | 23 | 3.41 | 349 |
| Paul O'Neill | 1985-1994 | .250 | 193 | 707 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Oates | 1976-1978 | .185 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Oberkfell | 1977-1991 | .265 | 30 | 681 | 0 | 0 | 0 | 0.00 | 0 |
| Hiromitsu Ochiai | 1982-1994 | .248 | 402 | 1240 | 0 | 0 | 0 | 0.00 | 0 |
| Blue Moon Odom | 1976-1979 | .000 | 0 | 0 | 10 | 14 | 3 | 4.29 | 179 |
| Ron Oester | 1978-1991 | .262 | 124 | 748 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Offerman | 1990-1994 | .266 | 14 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Rowland Office | 1976-1982 | .267 | 5 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Chad Ogea | 1994-1994 | .000 | 0 | 0 | 0 | 4 | 0 | 7.41 | 21 |
| Ben Oglivie | 1976-1983 | .256 | 175 | 600 | 0 | 0 | 0 | 0.00 | 0 |
| Sadaharu Oh | 1976-1977 | .214 | 44 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Ojeda | 1982-1994 | .000 | 0 | 0 | 159 | 114 | 0 | 3.62 | 1719 |
| John Olerud | 1989-1994 | .282 | 116 | 472 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Olin | 1989-1994 | .000 | 0 | 0 | 2 | 1 | 1 | 1.99 | 39 |
| Jose Oliva | 1994-1994 | .165 | 20 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oliva | 1976-1976 | .206 | 5 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Omar Olivares | 1991-1994 | .000 | 0 | 0 | 22 | 13 | 0 | 3.48 | 190 |
| Al Oliver | 1976-1982 | .285 | 105 | 514 | 0 | 0 | 0 | 0.00 | 0 |
| Darren Oliver | 1993-1994 | .000 | 0 | 0 | 3 | 6 | 0 | 5.05 | 67 |
| Joe Oliver | 1989-1994 | .220 | 60 | 229 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Oliveras | 1989-1993 | .000 | 0 | 0 | 3 | 20 | 2 | 7.22 | 109 |
| Al Olmsted | 1980-1983 | .000 | 0 | 0 | 0 | 3 | 0 | 5.18 | 37 |
| Greg Olson | 1992-1993 | .147 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Gregg Olson | 1988-1994 | .000 | 0 | 0 | 25 | 8 | 19 | 2.82 | 335 |
| Steve Ontiveros | 1985-1994 | .000 | 0 | 0 | 38 | 28 | 14 | 4.35 | 421 |
| Steve Ontiveros | 1976-1982 | .273 | 20 | 195 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Oquendo | 1984-1994 | .234 | 31 | 466 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Oquist | 1993-1994 | .000 | 0 | 0 | 0 | 0 | 0 | 9.87 | 18 |
| Jesse Orosco | 1979-1992 | .000 | 0 | 0 | 36 | 48 | 90 | 3.73 | 589 |
| Joe Orsulak | 1984-1994 | .255 | 28 | 189 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Orta | 1976-1987 | .276 | 81 | 525 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Ortiz | 1991-1991 | .261 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Junior Ortiz | 1983-1991 | .249 | 0 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| John Orton | 1993-1993 | .122 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Donovan Osborne | 1992-1994 | .000 | 0 | 0 | 14 | 24 | 3 | 5.21 | 225 |
| Al Osuna | 1990-1990 | .000 | 0 | 0 | 0 | 2 | 0 | 10.29 | 4 |
| Amos Otis | 1976-1985 | .255 | 143 | 576 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Ott | 1979-1983 | .200 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Otten | 1976-1980 | .000 | 0 | 0 | 12 | 8 | 17 | 2.81 | 97 |
| Dave Otto | 1987-1988 | .000 | 0 | 0 | 5 | 5 | 1 | 5.86 | 42 |
| Mike Overy | 1977-1981 | .000 | 0 | 0 | 3 | 9 | 47 | 3.41 | 154 |
| Bob Owchinko | 1976-1979 | .000 | 0 | 0 | 10 | 10 | 0 | 4.09 | 76 |
| Spike Owen | 1984-1994 | .215 | 57 | 444 | 0 | 0 | 0 | 0.00 | 0 |
| Jayhawk Owens | 1993-1993 | .344 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
