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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 |
|---|---|---|---|---|---|---|---|---|---|
| Austin O'Banion | 2018-2018 | .234 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Brien | 2014-2015 | .271 | 12 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Conner | 2013-2013 | .188 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Dowd | 2013-2014 | .256 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keefe | 2016-2018 | .256 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2015-2016 | .261 | 11 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Rourke | 2016-2016 | .000 | 0 | 0 | 1 | 1 | 1 | 1.69 | 6 |
| Tanner O'Tremba | 2023-2023 | .255 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Norberto Obeso | 2021-2021 | .244 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Nathaniel Ochoa Leyva | 2023-2023 | .250 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Ochsenbein | 2020-2023 | .000 | 0 | 0 | 6 | 0 | 17 | 3.07 | 82 |
| Joe Odom | 2016-2017 | .255 | 16 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Jochi Ogando | 2016-2016 | .000 | 0 | 0 | 1 | 1 | 1 | 5.51 | 49 |
| Nefi Ogando | 2016-2016 | .000 | 0 | 0 | 2 | 4 | 10 | 7.15 | 30 |
| Braeden Ogle | 2017-2020 | .000 | 0 | 0 | 5 | 6 | 0 | 8.92 | 83 |
| Tyler Ogle | 2013-2013 | .205 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Pierson Ohl | 2022-2022 | .000 | 0 | 0 | 3 | 1 | 0 | 4.32 | 40 |
| Wyatt Olds | 2022-2022 | .000 | 0 | 0 | 0 | 1 | 0 | 3.86 | 17 |
| Jared Oliva | 2018-2019 | .258 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Russ Olive | 2019-2021 | .214 | 6 | 18 | 0 | 0 | 0 | 9.00 | 1 |
| Rafael Oliveras | 2014-2016 | .225 | 12 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Christian Olivo | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Oller | 2018-2018 | .000 | 0 | 0 | 0 | 2 | 0 | 5.21 | 21 |
| Jorge Ona | 2018-2023 | .294 | 9 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Oquendo | 2015-2018 | .284 | 2 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Ernny Ordonez | 2022-2022 | .209 | 8 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Magglio Ordonez Jr. | 2016-2016 | .244 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Orlan | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 6.94 | 15 |
| Jonathan Ornelas | 2020-2020 | .266 | 5 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Jio Orozco | 2019-2019 | .162 | 3 | 10 | 1 | 3 | 0 | 7.34 | 29 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Dennis Ortega | 2020-2023 | .291 | 13 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortega | 2017-2017 | .000 | 0 | 0 | 3 | 0 | 1 | 1.27 | 40 |
| Jesus Ortiz | 2019-2019 | .000 | 0 | 0 | 3 | 10 | 0 | 9.93 | 28 |
| Robinson Ortiz | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 3.45 | 16 |
| Eric Orze | 2021-2021 | .000 | 0 | 0 | 1 | 2 | 1 | 4.05 | 26 |
| J.D. Osborne | 2019-2022 | .267 | 10 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Osinski | 2019-2019 | .364 | 6 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Ottenbreit | 2022-2022 | .000 | 0 | 0 | 1 | 7 | 0 | 5.51 | 62 |
| Connor Overton | 2016-2017 | .000 | 0 | 0 | 1 | 2 | 0 | 5.79 | 16 |
| Johan Oviedo | 2019-2019 | .000 | 0 | 0 | 2 | 2 | 0 | 10.57 | 12 |
| Hunter Owen | 2018-2018 | .800 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Drake Owenby | 2018-2018 | .000 | 0 | 0 | 1 | 2 | 0 | 4.37 | 51 |
| Connor Owings | 2019-2019 | .174 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
