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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lefty O'Doul | 1921-1937 | 23 | 12 | .657 | 3.50 | 47 | 38 | 28 | 1 | 2 | 336.2 | 348 | 131 | 16 | 108 | 65 |
| Prince Oana | 1929-1941 | 0 | 0 | .000 | 10.50 | 3 | 0 | 0 | 0 | 0 | 6.0 | 9 | 7 | 1 | 7 | 0 |
| Joe Oeschger | 1926-1926 | 1 | 2 | .333 | 5.50 | 14 | 0 | 0 | 0 | 2 | 18.0 | 30 | 11 | 3 | 12 | 7 |
| Red Oldham | 1925-1925 | 5 | 2 | .714 | 1.74 | 39 | 0 | 0 | 0 | 4 | 51.2 | 51 | 10 | 1 | 16 | 15 |
| Floyd Olds | 1936-1940 | 4 | 7 | .364 | 5.54 | 87 | 0 | 0 | 0 | 4 | 156.0 | 187 | 96 | 12 | 76 | 46 |
| Al Olsen | 1939-1941 | 10 | 14 | .417 | 4.86 | 77 | 9 | 6 | 0 | 6 | 172.1 | 225 | 93 | 14 | 81 | 46 |
| Rusty Olsen | 1930-1932 | 0 | 1 | .000 | 2.25 | 1 | 0 | 0 | 0 | 0 | 4.0 | 5 | 1 | 0 | 5 | 1 |
| Joe Orrell | 1940-1941 | 7 | 6 | .538 | 3.77 | 52 | 8 | 1 | 0 | 7 | 133.2 | 143 | 56 | 13 | 65 | 71 |
| Lefty Ortman | 1925-1932 | 18 | 32 | .360 | 6.54 | 174 | 21 | 5 | 0 | 9 | 380.0 | 511 | 276 | 42 | 204 | 115 |
| Ossie Orwoll | 1931-1933 | 9 | 20 | .310 | 4.29 | 46 | 31 | 20 | 1 | 1 | 262.1 | 295 | 125 | 21 | 128 | 116 |
| Don Osborn | 1929-1941 | 65 | 99 | .396 | 4.53 | 353 | 143 | 42 | 1 | 31 | 1314.1 | 1661 | 661 | 45 | 365 | 324 |
| Wayne Osborne | 1931-1941 | 37 | 52 | .416 | 5.68 | 278 | 48 | 20 | 1 | 23 | 688.0 | 910 | 434 | 73 | 299 | 203 |
