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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 |
|---|---|---|---|---|---|---|---|---|---|
| Peter O'Brien | 1999-1999 | .160 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ray O'Brien | 1983-1985 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Paddy O'Connor | 1988-1988 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 1997-1999 | .000 | 0 | 0 | 14 | 11 | 0 | 3.79 | 163 |
| Brett Oberholtzer | 1996-1998 | .000 | 0 | 0 | 9 | 6 | 2 | 4.46 | 121 |
| Ken Oberkfell | 1980-1989 | .270 | 13 | 483 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Odorizzi | 1992-1999 | .000 | 0 | 0 | 47 | 67 | 0 | 5.15 | 661 |
| Ron Oester | 1980-1989 | .265 | 14 | 197 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglivie | 1980-1987 | .232 | 54 | 241 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Ojeda | 1980-1993 | .000 | 0 | 0 | 137 | 103 | 0 | 3.98 | 1185 |
| Tony Oliva | 1982-1985 | .292 | 53 | 296 | 0 | 0 | 0 | 0.00 | 0 |
| Al Oliver | 1980-1986 | .316 | 45 | 338 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Oliver | 1988-1999 | .257 | 142 | 554 | 0 | 0 | 0 | 6.75 | 1 |
| Ray Olmedo | 1995-1999 | .158 | 2 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Olsen | 1984-1999 | .000 | 0 | 0 | 36 | 30 | 17 | 3.87 | 348 |
| Karl Olson | 1951-1956 | .238 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Steve R Ontiveros | 1980-1980 | .308 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Orta | 1980-1983 | .251 | 18 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Al Orth | 1991-1999 | .224 | 20 | 80 | 105 | 74 | 0 | 3.91 | 933 |
| Jose D Ortiz | 1999-1999 | .250 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Russ Ortiz | 1994-1998 | .000 | 0 | 0 | 25 | 33 | 1 | 4.83 | 340 |
| Bob Osborn | 1990-1999 | .000 | 0 | 0 | 28 | 17 | 41 | 3.99 | 258 |
| Wayne Osborne | 1998-1999 | .000 | 0 | 0 | 7 | 5 | 2 | 4.34 | 70 |
| Claude Osteen | 1988-1999 | .000 | 0 | 0 | 109 | 139 | 1 | 4.54 | 982 |
| Amos Otis | 1980-1981 | .264 | 4 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Kazuaki Otomo | 1988-1992 | .224 | 5 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Ott | 1982-1984 | .208 | 9 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Otten | 1981-1984 | .000 | 0 | 0 | 4 | 7 | 2 | 4.93 | 82 |
| Bob Owchinko | 1982-1984 | .000 | 0 | 0 | 0 | 0 | 0 | 3.86 | 4 |
| Henry Owens | 1999-1999 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
