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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 | 2016-2020 | .000 | 0 | 0 | 0 | 2 | 0 | 6.14 | 9 |
| Eddie O'Bryan | 2028-2028 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2015-2017 | .294 | 23 | 177 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Day | 2026-2028 | .244 | 21 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| P.J. O'Keefe | 2015-2024 | .265 | 25 | 163 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2023-2024 | .000 | 0 | 0 | 8 | 6 | 7 | 2.06 | 71 |
| Anderson O'Mara | 2025-2025 | .000 | 0 | 0 | 2 | 2 | 0 | 2.22 | 18 |
| Mark O'Monaghan | 2017-2018 | .264 | 8 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neil | 2029-2029 | .237 | 10 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2023-2023 | .000 | 0 | 0 | 2 | 2 | 16 | 2.98 | 16 |
| Eric O'Neill | 2020-2020 | .403 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Neill | 2027-2029 | .222 | 4 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin O'Quinlevan | 2023-2023 | .216 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ed O'Quinn | 2026-2027 | .000 | 0 | 0 | 17 | 13 | 0 | 3.76 | 200 |
| Ron O'Slattery | 2015-2015 | .000 | 0 | 0 | 1 | 0 | 0 | 1.08 | 6 |
| Dale O'Sullivan | 2017-2018 | .444 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Toole | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 1.50 | 3 |
| Alin Oanta | 2017-2018 | .000 | 0 | 0 | 11 | 9 | 0 | 5.51 | 87 |
| Héctor Ocampo | 2020-2024 | .000 | 0 | 0 | 10 | 21 | 1 | 5.15 | 193 |
| Luis Ochoa | 2025-2029 | .000 | 0 | 0 | 8 | 6 | 7 | 3.48 | 51 |
| Hirohisa Ogasawara | 2029-2029 | .417 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Shigenobu Ohayashi | 2029-2029 | .257 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Piotr Oja | 2027-2027 | .000 | 0 | 0 | 7 | 4 | 0 | 2.76 | 93 |
| Kazuchika Okada | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 40.50 | 0 |
| Noriaki Okada | 2022-2022 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Olivares | 2015-2018 | .300 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Olivo | 2026-2029 | .258 | 9 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2016-2023 | .275 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Olvera | 2016-2019 | .243 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2016-2019 | .000 | 0 | 0 | 11 | 6 | 11 | 4.22 | 186 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Octávio Ontiveros | 2028-2029 | .220 | 2 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Anbrosio Oppenes | 2020-2025 | .237 | 13 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Oquendo | 2027-2028 | .000 | 0 | 0 | 14 | 18 | 4 | 5.33 | 170 |
| Dave Orchard | 2015-2019 | .270 | 7 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2021-2021 | .270 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2016-2018 | .276 | 3 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2023-2027 | .000 | 0 | 0 | 2 | 2 | 2 | 5.23 | 55 |
| Cisco Ortega | 2024-2024 | .000 | 0 | 0 | 1 | 2 | 1 | 7.84 | 6 |
| José Ortega | 2021-2021 | .237 | 2 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2023-2023 | .248 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2022-2024 | .304 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2020 | .279 | 19 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2016-2018 | .000 | 0 | 0 | 7 | 11 | 6 | 5.81 | 83 |
| Luis Ortíz | 2016-2024 | .000 | 0 | 0 | 15 | 16 | 9 | 3.60 | 301 |
| Orlando Ortíz | 2018-2020 | .200 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Pancho Ortíz | 2028-2029 | .000 | 0 | 0 | 1 | 1 | 0 | 3.86 | 11 |
| Vincente Ortíz | 2021-2022 | .000 | 0 | 0 | 5 | 6 | 16 | 4.81 | 17 |
| John Orton | 2026-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 2.92 | 7 |
| Richard Osborn | 2028-2028 | .000 | 0 | 0 | 2 | 4 | 21 | 3.35 | 39 |
| Roger Osborne | 2015-2017 | .282 | 16 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| José Osorio | 2023-2024 | .244 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Osorio | 2028-2028 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kichisaburo Otani | 2024-2025 | .330 | 6 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2026-2028 | .000 | 0 | 0 | 10 | 6 | 3 | 2.60 | 127 |
| Jasper Otto | 2022-2022 | .236 | 3 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oudekirk | 2024-2028 | .216 | 6 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 5 | 6 | 0 | 2.90 | 115 |
| Rich Overby | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 11.74 | 7 |
| Doruk Oyan | 2023-2025 | .000 | 0 | 0 | 13 | 15 | 0 | 4.40 | 217 |
