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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 |
|---|---|---|---|---|---|---|---|---|---|
| Zach O'Flaherty | 1955-1955 | .000 | 0 | 0 | 5 | 6 | 0 | 3.83 | 66 |
| Andy O'Quinn | 1953-1953 | .000 | 0 | 0 | 4 | 2 | 11 | 2.16 | 42 |
| Niko Obradovic | 1955-1958 | .238 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Aleksandar Obrenovic | 1954-1955 | .246 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Lakew Odoyo | 1953-1957 | .000 | 0 | 0 | 17 | 16 | 0 | 4.17 | 227 |
| Aguri Ogata | 1958-1958 | .000 | 0 | 0 | 0 | 0 | 0 | 1.93 | 3 |
| Tomohisa Okuhara | 1952-1953 | .000 | 0 | 0 | 12 | 12 | 16 | 3.85 | 119 |
| Takehiko Okuno | 1952-1959 | .000 | 0 | 0 | 2 | 0 | 1 | 4.53 | 45 |
| Adelbert Olinger | 1958-1958 | .000 | 0 | 0 | 4 | 5 | 0 | 6.14 | 37 |
| Ruprecht Oliver | 1958-1958 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Olson | 1955-1955 | .241 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshitomo Ono | 1953-1953 | .179 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Orlandi | 1955-1958 | .286 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Orndorff | 1955-1955 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Ortiz | 1953-1953 | .302 | 7 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jeigif Ovsepyan | 1956-1959 | .000 | 0 | 0 | 7 | 2 | 1 | 5.85 | 101 |
| Motohiro Oyama | 1957-1957 | .192 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
