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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 | 2018-2019 | .237 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Grady | 2013-2014 | .000 | 0 | 0 | 2 | 1 | 3 | 4.38 | 38 |
| Ryan O'Hearn | 2015-2015 | .276 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keefe | 2015-2016 | .256 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2014-2014 | .336 | 13 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Och | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 10 |
| Rougned Odor | 2013-2013 | .458 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Emilio Ogando | 2015-2023 | .000 | 0 | 0 | 5 | 1 | 1 | 2.17 | 87 |
| Jochi Ogando | 2014-2015 | .000 | 0 | 0 | 3 | 3 | 0 | 9.24 | 77 |
| Ryne Ogren | 2020-2020 | .322 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Oh | 2013-2013 | .229 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Pierson Ohl | 2023-2023 | .000 | 0 | 0 | 9 | 1 | 0 | 2.64 | 109 |
| Steven Okert | 2013-2014 | .000 | 0 | 0 | 8 | 4 | 1 | 6.41 | 119 |
| Jared Oliva | 2018-2018 | .321 | 12 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Helcris Olivarez | 2022-2022 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 5 |
| Rafael Oliveras | 2017-2018 | .240 | 14 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Olloque | 2015-2017 | .267 | 12 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| David Olmedo-Barrera | 2016-2016 | .318 | 15 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Olson | 2016-2016 | .235 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| J.B. Olson | 2018-2023 | .000 | 0 | 0 | 3 | 4 | 0 | 9.63 | 30 |
| Matt Olson | 2013-2013 | .329 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Reese Olson | 2020-2021 | .000 | 0 | 0 | 9 | 3 | 0 | 3.95 | 103 |
| Ben Onyshko | 2019-2019 | .000 | 0 | 0 | 3 | 0 | 0 | 5.51 | 25 |
| Demi Orimoloye | 2017-2017 | .247 | 8 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Orlan | 2013-2013 | .000 | 0 | 0 | 1 | 0 | 1 | 1.93 | 10 |
| Tyler Orris | 2017-2017 | .280 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Kaleb Ort | 2019-2023 | .000 | 0 | 0 | 7 | 2 | 6 | 5.65 | 96 |
| Dennis Ortega | 2018-2021 | .201 | 9 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Irving Ortega | 2017-2021 | .289 | 3 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ortega | 2020-2020 | .254 | 5 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Braulio Ortiz | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 4.91 | 23 |
| Jose Ortiz | 2013-2015 | .280 | 20 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Osuna | 2013-2013 | .000 | 0 | 0 | 1 | 3 | 0 | 5.62 | 29 |
| Michel Otanez | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 3.00 | 16 |
| Andy Otero | 2013-2015 | .750 | 0 | 0 | 7 | 12 | 0 | 7.17 | 207 |
| Riley Ottesen | 2022-2022 | .000 | 0 | 0 | 1 | 2 | 0 | 3.02 | 71 |
| Ariel Ovando | 2016-2016 | .000 | 0 | 0 | 3 | 2 | 1 | 8.68 | 10 |
| Noah Owen | 2022-2023 | .000 | 0 | 0 | 3 | 1 | 0 | 2.31 | 45 |
| Tyler Owens | 2020-2022 | .000 | 0 | 0 | 2 | 1 | 0 | 1.90 | 29 |
