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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2016-2021 | .000 | 0 | 0 | 3 | 4 | 1 | 6.93 | 54 |
| Eddie O'Bryan | 2020-2020 | .268 | 3 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2021-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 2.12 | 9 |
| Dave O'Day | 2015-2019 | .231 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2020-2021 | .000 | 0 | 0 | 1 | 3 | 3 | 4.47 | 56 |
| Mark O'Monaghan | 2018-2018 | .434 | 6 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2015-2021 | .000 | 0 | 0 | 19 | 11 | 0 | 3.69 | 172 |
| Alin Oanta | 2019-2021 | .000 | 0 | 0 | 10 | 6 | 0 | 4.70 | 144 |
| Brian Olivares | 2018-2019 | .256 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2017-2019 | .312 | 19 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2016-2021 | .282 | 36 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Olvera | 2015-2015 | .240 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2021-2021 | .000 | 0 | 0 | 3 | 0 | 1 | 0.56 | 11 |
| Dave Orchard | 2015-2021 | .334 | 16 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2021-2021 | .242 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2017-2017 | .000 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2017-2020 | .250 | 28 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Ortega | 2015-2015 | .312 | 5 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2017 | .282 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2020-2021 | .000 | 0 | 0 | 14 | 12 | 0 | 5.27 | 112 |
| José Ortíz | 2019-2021 | .000 | 0 | 0 | 7 | 17 | 40 | 5.94 | 57 |
| Luis Ortíz | 2021-2021 | .000 | 0 | 0 | 2 | 6 | 0 | 5.60 | 25 |
| Pedro Ortíz | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 1 | 6.43 | 5 |
| Andrew Osborne | 2015-2016 | .000 | 0 | 0 | 6 | 7 | 0 | 6.25 | 31 |
| Ken Osborne | 2020-2021 | .283 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Roger Osborne | 2018-2021 | .268 | 11 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Wesley Osborne | 2017-2017 | .233 | 10 | 55 | 0 | 0 | 0 | 0.00 | 0 |
