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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 | 1995-1999 | .187 | 8 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Peter O'Brien | 1996-1998 | .207 | 18 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Ray O'Brien | 1983-1985 | .229 | 7 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Paddy O'Connor | 1985-1990 | .213 | 7 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 1997-1998 | .667 | 0 | 0 | 10 | 20 | 0 | 4.36 | 157 |
| Brett Oberholtzer | 1995-1999 | .000 | 0 | 0 | 5 | 5 | 15 | 1.57 | 60 |
| Ken Oberkfell | 1980-1980 | .378 | 4 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Odorizzi | 1988-1998 | .000 | 0 | 0 | 23 | 75 | 1 | 7.17 | 444 |
| Ron Oester | 1980-1989 | .291 | 3 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglivie | 1986-1986 | .296 | 20 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Ojeda | 1980-1995 | .000 | 0 | 0 | 20 | 43 | 0 | 5.72 | 180 |
| Tony Oliva | 1981-1981 | .127 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Oliver | 1988-1994 | .293 | 37 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Olmedo | 1991-1999 | .277 | 26 | 274 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Olsen | 1984-1999 | .000 | 0 | 0 | 1 | 3 | 1 | 4.47 | 61 |
| Karl Olson | 1987-1991 | .289 | 16 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olt | 1999-1999 | .204 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Steve R Ontiveros | 1980-1982 | .421 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Orta | 1982-1987 | .285 | 60 | 251 | 0 | 0 | 0 | 0.00 | 0 |
| Al Orth | 1990-1991 | .000 | 0 | 0 | 18 | 6 | 0 | 2.74 | 229 |
| Jose D Ortiz | 1995-1999 | .243 | 48 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Russ Ortiz | 1992-1999 | .000 | 0 | 0 | 42 | 24 | 0 | 2.94 | 738 |
| Bob Osborn | 1990-1999 | .000 | 0 | 0 | 7 | 5 | 21 | 2.11 | 86 |
| Wayne Osborne | 1997-1997 | .000 | 0 | 0 | 0 | 1 | 0 | 7.71 | 2 |
| Claude Osteen | 1981-1985 | .000 | 0 | 0 | 4 | 26 | 0 | 7.81 | 82 |
| Amos Otis | 1982-1983 | .293 | 28 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Otis | 1999-1999 | .093 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Kazuaki Otomo | 1986-1990 | .220 | 7 | 73 | 0 | 0 | 0 | 10.80 | 2 |
| Ed Ott | 1980-1985 | .257 | 48 | 184 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Otten | 1980-1985 | .000 | 0 | 0 | 9 | 7 | 12 | 3.77 | 133 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bob Owchinko | 1982-1984 | .000 | 0 | 0 | 15 | 9 | 0 | 3.10 | 224 |
| Henry Owens | 1994-1999 | .000 | 0 | 0 | 18 | 16 | 21 | 1.95 | 371 |
