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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 |
|---|---|---|---|---|---|---|---|---|---|
| Chi-hun O | 2021-2022 | .000 | 0 | 0 | 1 | 0 | 1 | 1.35 | 4 |
| Eddie O'Bryan | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Colin O'Connell | 2028-2028 | .357 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Day | 2026-2026 | .280 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Gary O'Herlihy | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 8.44 | 2 |
| Melvin O'Herlihy | 2031-2031 | .000 | 0 | 0 | 0 | 10 | 0 | 6.36 | 53 |
| Vincent O'Higgin | 2028-2028 | .000 | 0 | 0 | 2 | 7 | 0 | 4.18 | 85 |
| Matt O'Keevan | 2031-2031 | .000 | 0 | 0 | 2 | 7 | 0 | 6.99 | 57 |
| Larry O'Morgan | 2025-2025 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neil | 2028-2028 | .253 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin O'Quinlevan | 2020-2020 | .305 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny O'Quinn | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 7.20 | 3 |
| Goodluck Obasanjo | 2029-2029 | .000 | 0 | 0 | 3 | 4 | 0 | 2.84 | 106 |
| Bobby Ochs | 2028-2029 | .180 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Hirohisa Ogasawara | 2028-2028 | .283 | 4 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Caleb Ogle | 2029-2030 | .267 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Robby Oglethorpe | 2030-2030 | .000 | 0 | 0 | 3 | 6 | 0 | 5.01 | 80 |
| Shigenobu Ohayashi | 2028-2028 | .370 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2020-2020 | .000 | 0 | 0 | 7 | 5 | 0 | 2.55 | 79 |
| Kazuchika Okada | 2031-2031 | .000 | 0 | 0 | 0 | 6 | 0 | 5.10 | 53 |
| Idowu Okonjo | 2030-2030 | .000 | 0 | 0 | 2 | 6 | 3 | 4.50 | 76 |
| Luis Oliva | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 1 |
| Ramón Oliveira | 2020-2021 | .000 | 0 | 0 | 2 | 6 | 0 | 7.28 | 37 |
| Robert Olson | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 4.19 | 13 |
| Emil Olsson | 2025-2026 | .000 | 0 | 0 | 8 | 6 | 0 | 3.65 | 105 |
| Gerold Olthof | 2031-2031 | .278 | 10 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| José Olvera | 2026-2026 | .315 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Milan Opalka | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 5 |
| Juan Ordóńez | 2023-2023 | .000 | 0 | 0 | 6 | 2 | 1 | 4.07 | 25 |
| José Orihvela | 2026-2026 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Román Ornelas | 2031-2031 | .000 | 0 | 0 | 2 | 0 | 16 | 0.26 | 53 |
| Cruz Orneleas | 2031-2031 | .282 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Germán Orozco | 2020-2020 | .000 | 0 | 0 | 3 | 2 | 5 | 2.37 | 31 |
| Curt Orser | 2030-2030 | .000 | 0 | 0 | 5 | 2 | 4 | 2.06 | 41 |
| Cisco Ortega | 2021-2026 | .000 | 0 | 0 | 3 | 2 | 2 | 2.26 | 51 |
| Francisco Ortega | 2027-2027 | .500 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2021-2021 | .237 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortega | 2026-2027 | .235 | 8 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2029-2029 | .000 | 0 | 0 | 4 | 10 | 0 | 4.63 | 99 |
| António Ortíz | 2031-2031 | .212 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortíz | 2021-2025 | .000 | 0 | 0 | 43 | 20 | 0 | 2.71 | 564 |
| Carlos Ortíz | 2027-2028 | .000 | 0 | 0 | 4 | 2 | 1 | 3.22 | 43 |
| Cisco Ortíz | 2023-2023 | .000 | 0 | 0 | 7 | 7 | 0 | 3.40 | 131 |
| Emílio Ortíz | 2020-2020 | .272 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Gustavo Ortíz | 2029-2029 | .254 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2023-2023 | .226 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2025-2026 | .319 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| José Antonio Ortíz | 2025-2025 | 1.000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Pancho Ortíz | 2025-2025 | .000 | 0 | 0 | 2 | 1 | 10 | 1.38 | 38 |
| Pedro Ortíz | 2029-2031 | .000 | 0 | 0 | 3 | 6 | 4 | 2.77 | 110 |
| Raúl Ortíz | 2022-2023 | .286 | 2 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ortíz | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 1.12 | 9 |
| Sergio Ortíz | 2021-2022 | .259 | 9 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Orwig | 2030-2030 | .200 | 0 | 1 | 0 | 0 | 0 | 27.00 | 0 |
| Richard Osborn | 2025-2027 | .000 | 0 | 0 | 3 | 9 | 45 | 2.17 | 134 |
| Francis Osborne | 2031-2031 | .276 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| José Osorio | 2021-2021 | .281 | 0 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Kichisaburo Otani | 2020-2023 | .249 | 3 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Peter Ough | 2029-2029 | .253 | 2 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Santtu Öunap | 2031-2031 | .000 | 0 | 0 | 2 | 1 | 1 | 4.05 | 42 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Odemar Ouweneel | 2021-2021 | .000 | 0 | 0 | 3 | 1 | 11 | 0.57 | 39 |
| Marvin Overbeek | 2031-2031 | .220 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Rich Overby | 2027-2029 | .000 | 0 | 0 | 7 | 7 | 4 | 2.97 | 143 |
| Alfred Owen | 2028-2028 | .158 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
