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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 |
|---|---|---|---|---|---|---|---|---|---|
| Darby O'Brien | 1904-1905 | .455 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry O'Dell | 1905-1914 | .198 | 3 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Kid O'Hara | 1904-1909 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Neill | 1904-1914 | .225 | 19 | 176 | 0 | 0 | 0 | 0.00 | 0 |
| Frank O'Shea | 1905-1906 | .245 | 0 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Toole | 1905-1914 | .180 | 0 | 1 | 134 | 134 | 4 | 3.13 | 1145 |
| Enrique Ocampo | 1906-1912 | .000 | 0 | 0 | 118 | 82 | 0 | 3.14 | 1138 |
| Norberto Ocampo | 1905-1914 | .274 | 37 | 269 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Odwell | 1904-1909 | .225 | 11 | 159 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Ogle | 1904-1907 | .000 | 0 | 0 | 49 | 43 | 6 | 2.46 | 272 |
| Pedro Olave | 1904-1914 | .245 | 61 | 257 | 158 | 88 | 0 | 3.47 | 1495 |
| Carmelo Olea | 1908-1914 | .245 | 19 | 240 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Oliva | 1906-1914 | .267 | 9 | 151 | 0 | 0 | 0 | 0.00 | 0 |
| Pitágoras Oliva | 1914-1914 | .326 | 8 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Serafín Olivares | 1914-1914 | .214 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Elton Olley | 1905-1914 | .269 | 3 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Dale Oloff | 1905-1914 | .244 | 4 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ontiveros | 1908-1914 | .270 | 16 | 147 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ontiveros | 1904-1911 | .000 | 0 | 0 | 39 | 43 | 1 | 3.41 | 242 |
| Juan Oquendo | 1904-1910 | .000 | 0 | 0 | 30 | 35 | 3 | 2.42 | 159 |
| Veloso Oquendo | 1907-1909 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Propercio Ordóñez | 1912-1914 | .307 | 31 | 190 | 0 | 0 | 0 | 0.00 | 0 |
| Román Orihuela | 1906-1914 | .253 | 29 | 312 | 0 | 0 | 0 | 0.00 | 0 |
| Christopher Orme | 1905-1914 | .259 | 13 | 191 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Oropesa | 1904-1913 | .261 | 4 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Oropeza | 1905-1914 | .273 | 2 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orozco | 1907-1914 | .162 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Álvaro Orozco | 1904-1912 | .260 | 3 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Amílcar Ortega | 1906-1908 | .311 | 5 | 163 | 0 | 0 | 0 | 0.00 | 0 |
| Andres Ortega | 1904-1914 | .188 | 0 | 2 | 183 | 153 | 19 | 3.63 | 2028 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Diodoro Ortega | 1908-1914 | .309 | 36 | 427 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ortega | 1904-1905 | .000 | 0 | 0 | 0 | 1 | 0 | 2.81 | 7 |
| Gilberto Ortega | 1904-1905 | .200 | 0 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortega | 1906-1914 | .000 | 0 | 0 | 8 | 11 | 9 | 4.13 | 179 |
| Alejandro Ortiz | 1904-1914 | .208 | 9 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortiz | 1906-1914 | .324 | 29 | 332 | 0 | 0 | 0 | 0.00 | 0 |
| Eusebio Ortiz | 1906-1913 | .000 | 0 | 0 | 153 | 96 | 20 | 2.52 | 1631 |
| Guillermo Ortiz | 1913-1913 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Osuna | 1913-1914 | .319 | 13 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Otero | 1907-1914 | .246 | 7 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Otten | 1904-1905 | .165 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Otto | 1906-1914 | .292 | 28 | 244 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Overstreet | 1905-1914 | .280 | 37 | 286 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Owen | 1905-1914 | .279 | 8 | 176 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Owings | 1905-1914 | .000 | 0 | 0 | 44 | 76 | 5 | 4.80 | 697 |
