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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 |
|---|---|---|---|---|---|---|---|---|---|
| Syd O'Brien | 1947-1957 | .247 | 28 | 254 | 0 | 0 | 0 | 13.50 | 0 |
| Jack W O'Connor | 1946-1949 | .000 | 0 | 0 | 22 | 40 | 0 | 4.10 | 144 |
| John E O'Donoghue | 1965-1966 | .000 | 0 | 0 | 3 | 6 | 0 | 5.89 | 12 |
| Greg O'Halloran | 1967-1969 | .217 | 6 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Malley | 1946-1950 | .266 | 2 | 47 | 0 | 0 | 0 | 81.00 | 0 |
| Randy O'Neal | 1952-1965 | .000 | 0 | 0 | 134 | 129 | 0 | 4.22 | 1145 |
| Tyler O'Neill | 1949-1953 | .292 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Oates | 1946-1955 | .258 | 21 | 260 | 0 | 0 | 0 | 0.00 | 0 |
| Brett Oberholtzer | 1947-1958 | .000 | 0 | 0 | 51 | 63 | 1 | 5.23 | 221 |
| Ken Oberkfell | 1946-1954 | .282 | 14 | 477 | 0 | 0 | 0 | 33.75 | 1 |
| Alex Ochoa | 1953-1966 | .251 | 29 | 246 | 0 | 0 | 0 | 0.00 | 0 |
| Blue Moon Odom | 1956-1960 | .000 | 0 | 0 | 0 | 3 | 0 | 7.56 | 12 |
| Jose Offerman | 1946-1951 | .291 | 2 | 148 | 0 | 0 | 0 | 0.00 | 0 |
| Rowland Office | 1969-1969 | .273 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Will Ohman | 1952-1965 | .000 | 0 | 0 | 38 | 30 | 28 | 3.85 | 547 |
| Shohei Ohtani | 1967-1969 | .240 | 43 | 171 | 0 | 0 | 0 | 0.00 | 0 |
| Augie Ojeda | 1946-1950 | .262 | 0 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Len Okrie | 1950-1953 | .267 | 3 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Al Oliver | 1946-1961 | .310 | 220 | 1468 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Oliver | 1954-1968 | .288 | 278 | 1067 | 0 | 0 | 0 | 0.00 | 0 |
| Lester Oliveros | 1950-1965 | .000 | 0 | 0 | 44 | 31 | 40 | 4.12 | 328 |
| Miguel Olivo | 1952-1964 | .243 | 98 | 405 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Olmedo | 1958-1959 | .192 | 6 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Olsen | 1959-1968 | .000 | 0 | 0 | 20 | 28 | 10 | 4.60 | 231 |
| Greg Olson | 1946-1954 | .211 | 15 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Olson | 1969-1969 | .308 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ontiveros | 1955-1966 | .000 | 0 | 0 | 8 | 13 | 5 | 4.76 | 92 |
| Steve R Ontiveros | 1956-1969 | .276 | 76 | 684 | 0 | 0 | 0 | 0.00 | 0 |
| Ernie Oravetz | 1957-1966 | .231 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ordaz | 1968-1969 | .182 | 5 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Joe Orrell | 1960-1967 | .000 | 0 | 0 | 30 | 32 | 79 | 3.22 | 406 |
| Phil Ortega | 1953-1957 | .000 | 0 | 0 | 4 | 17 | 1 | 6.41 | 97 |
| Daniel Ortmeier | 1968-1969 | .233 | 15 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Osborn | 1947-1964 | .000 | 0 | 0 | 184 | 193 | 0 | 4.10 | 1585 |
| Jose Osuna | 1952-1954 | .175 | 8 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Ottavino | 1966-1969 | .000 | 0 | 0 | 8 | 6 | 3 | 2.89 | 93 |
| Jim Otten | 1951-1961 | .000 | 0 | 0 | 40 | 21 | 28 | 3.41 | 353 |
| Phil Ouellette | 1965-1965 | .175 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Carlos Oviedo | 1948-1948 | .000 | 0 | 0 | 0 | 0 | 0 | 12.27 | 0 |
| Mickey Owen | 1954-1969 | .232 | 15 | 324 | 0 | 0 | 0 | 0.00 | 0 |
