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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 |
|---|---|---|---|---|---|---|---|---|---|
| Buck O'Brien | 1911-1911 | .115 | 0 | 9 | 15 | 19 | 0 | 3.43 | 173 |
| Jack O'Brien | 1899-1903 | .246 | 13 | 167 | 0 | 0 | 0 | 0.00 | 0 |
| Pete O'Brien | 1901-1906 | .257 | 0 | 33 | 1 | 1 | 0 | 4.91 | 0 |
| John O'Connell | 1891-1891 | .172 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jack O'Connor | 1887-1905 | .273 | 18 | 665 | 0 | 0 | 0 | 0.00 | 0 |
| Paddy O'Connor | 1909-1911 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Hal O'Hagan | 1892-1892 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Hara | 1909-1910 | .329 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Kid O'Hara | 1904-1904 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Hara | 1906-1906 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Charley O'Leary | 1904-1911 | .239 | 1 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Jack O'Neill | 1902-1905 | .214 | 1 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neill | 1904-1906 | .263 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neill | 1899-1899 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 1901-1906 | .186 | 1 | 29 | 84 | 92 | 1 | 3.46 | 561 |
| Jim O'Rourke | 1874-1893 | .309 | 61 | 1143 | 0 | 1 | 2 | 4.12 | 4 |
| Patsy O'Rourke | 1908-1908 | .125 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Queenie O'Rourke | 1908-1908 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marty O'Toole | 1910-1911 | .308 | 0 | 0 | 1 | 0 | 0 | 5.15 | 29 |
| Rebel Oakes | 1909-1911 | .246 | 4 | 171 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Oberlin | 1906-1907 | .000 | 0 | 0 | 0 | 0 | 1 | 5.40 | 4 |
| Fred Odwell | 1904-1907 | .258 | 10 | 233 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Ohl | 1909-1909 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 0 |
| Rube Oldring | 1905-1911 | .263 | 10 | 390 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Olmstead | 1908-1911 | .152 | 0 | 11 | 22 | 30 | 2 | 3.33 | 168 |
| Ivy Olson | 1911-1911 | .241 | 0 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Al Orth | 1895-1909 | .259 | 12 | 156 | 200 | 191 | 7 | 3.39 | 1005 |
| Fred Osborn | 1907-1909 | .270 | 0 | 14 | 0 | 1 | 0 | 6.75 | 1 |
| Harry Ostdiek | 1906-1908 | .175 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Champ Osteen | 1903-1909 | .186 | 0 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bill Otey | 1909-1909 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 1 |
| Orval Overall | 1905-1911 | .164 | 1 | 41 | 86 | 64 | 6 | 2.33 | 794 |
| Frank Owen | 1901-1909 | .162 | 2 | 50 | 110 | 148 | 13 | 3.15 | 644 |
| Frank Owens | 1906-1909 | .130 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Red Owens | 1899-1905 | .167 | 0 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oyler | 1902-1902 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
