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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 |
|---|---|---|---|---|---|---|---|---|---|
| Brock O'Connell | 1907-1915 | .303 | 29 | 596 | 0 | 0 | 0 | 0.00 | 0 |
| Allen O'Leary | 1911-1915 | .244 | 1 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| Kane O'Leary | 1912-1915 | .250 | 0 | 4 | 5 | 6 | 0 | 2.58 | 42 |
| Woody O'Reilly | 1914-1914 | .000 | 0 | 0 | 1 | 0 | 0 | 9.00 | 0 |
| Calvagh O'Sullivan | 1908-1909 | .667 | 0 | 0 | 4 | 7 | 13 | 1.01 | 28 |
| Aimar Ochoa | 1905-1905 | .183 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Odio | 1906-1910 | .138 | 0 | 0 | 6 | 8 | 2 | 2.58 | 70 |
| Crisóstomo Ogando | 1905-1905 | .220 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Ogas | 1913-1913 | .135 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Egidio Olguín | 1909-1915 | .095 | 1 | 3 | 12 | 15 | 34 | 2.20 | 70 |
| Javier Olivarez | 1913-1914 | .143 | 1 | 6 | 9 | 12 | 3 | 1.89 | 117 |
| Agustín Oliveras | 1904-1915 | .233 | 12 | 150 | 0 | 0 | 0 | 0.00 | 0 |
| Diego Olivo | 1909-1910 | .000 | 0 | 0 | 1 | 0 | 0 | 7.11 | 4 |
| Ángel Olivo | 1908-1910 | .157 | 0 | 1 | 10 | 6 | 1 | 2.68 | 76 |
| Ramón Olmos | 1901-1901 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Jorge Orduño | 1910-1910 | .111 | 0 | 2 | 3 | 5 | 0 | 5.37 | 17 |
| Edelmiro Orihuela | 1902-1914 | .158 | 0 | 39 | 95 | 93 | 9 | 3.09 | 723 |
| Teócrito Orozco | 1901-1902 | .182 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Álvaro Orozco | 1902-1903 | .290 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Amílcar Ortega | 1908-1915 | .282 | 3 | 163 | 0 | 0 | 0 | 0.00 | 0 |
| Pandolfo Ortega | 1901-1901 | .000 | 0 | 0 | 1 | 3 | 0 | 4.58 | 5 |
| Hefesto Ortiz | 1904-1904 | .156 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Hernán Ortiz | 1909-1915 | .182 | 0 | 0 | 9 | 10 | 3 | 3.09 | 37 |
| José Ortiz | 1908-1915 | .259 | 2 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 1901-1901 | .237 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Martín Ortiz | 1910-1915 | .171 | 0 | 7 | 27 | 22 | 1 | 2.49 | 188 |
| Rafael Ortiz | 1901-1903 | .226 | 4 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortiz | 1905-1905 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Samuel Ortiz | 1903-1905 | .221 | 1 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Josías Ospina | 1906-1915 | .024 | 0 | 1 | 17 | 17 | 28 | 2.21 | 127 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Alfonso Otaño | 1910-1915 | .150 | 1 | 1 | 2 | 9 | 0 | 6.40 | 24 |
| Cosme Ovalle | 1910-1910 | .000 | 0 | 0 | 0 | 1 | 1 | 7.71 | 1 |
| Luis Oviedo | 1910-1915 | .143 | 0 | 11 | 23 | 24 | 0 | 2.94 | 208 |
| Raúl Ozuna | 1909-1915 | .148 | 3 | 36 | 75 | 68 | 1 | 2.73 | 613 |
