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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bryce O'Bryan | 1991-1998 | .199 | 1 | 14 | 53 | 74 | 1 | 4.39 | 765 |
| Bill O'Clancy | 1994-1998 | .180 | 1 | 22 | 52 | 51 | 0 | 3.09 | 683 |
| Artie O'Connor | 1991-1995 | .194 | 2 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Kearney | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Keefe | 1996-1998 | .000 | 0 | 0 | 0 | 0 | 0 | 11.57 | 2 |
| Nick O'Keefe | 1981-1984 | .244 | 5 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Roy O'Mullowney | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Andy O'Neil | 1989-1998 | .200 | 0 | 3 | 21 | 20 | 21 | 3.64 | 296 |
| Donnie O'Neil | 1991-1998 | .188 | 10 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Neil | 1993-1998 | 1.000 | 0 | 2 | 15 | 16 | 40 | 3.00 | 184 |
| Martin O'Neill | 1991-1996 | .000 | 0 | 1 | 1 | 2 | 0 | 4.66 | 12 |
| Spencer O'Neill | 1991-1998 | .230 | 22 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Randy O'Reilly | 1988-1992 | .256 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce O'Rourke | 1986-1998 | .198 | 3 | 31 | 100 | 105 | 8 | 4.34 | 985 |
| Adam O'Slattery | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jayson O'Slattery | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglethorpe | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Oglethorpe | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglethorpe Jr. | 1991-1998 | .218 | 1 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Oliva | 1981-1984 | .174 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Brad Oliver | 1989-1998 | .237 | 34 | 347 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Olvera | 1995-1998 | .333 | 0 | 0 | 12 | 8 | 2 | 4.74 | 91 |
| Alfonso Orozco | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Millard Orr | 1981-1988 | .193 | 0 | 11 | 25 | 49 | 1 | 5.74 | 342 |
| Tom Orr | 1981-1989 | .182 | 0 | 6 | 18 | 22 | 4 | 5.49 | 303 |
| Augusto Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortega | 1983-1996 | .241 | 75 | 300 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kelly Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| William Ortíz | 1991-1998 | .258 | 39 | 152 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Stephen Osborne | 1989-1997 | .236 | 39 | 171 | 0 | 0 | 0 | 0.00 | 0 |
| Júlio Otero | 1981-1983 | .279 | 17 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Owens | 1985-1994 | .000 | 0 | 0 | 0 | 1 | 0 | 4.50 | 18 |
| Hunter Owens | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Owens | 1996-1996 | .000 | 0 | 0 | 0 | 2 | 0 | 31.16 | 2 |
