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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ralph O'Brien | 1941-1941 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ike O'Donnell | 1946-1946 | .385 | 0 | 1 | 2 | 3 | 0 | 5.30 | 31 |
| Brendan O'Dowd | 1909-1917 | .318 | 5 | 150 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Gorman | 1907-1908 | .232 | 1 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Red O'Neal | 1928-1929 | .279 | 1 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Charlie O'Neil | 1916-1917 | .312 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Rourke | 1914-1915 | .091 | 0 | 2 | 21 | 17 | 0 | 4.85 | 437 |
| Charlie Oakes | 1944-1944 | .455 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Oates | 1937-1937 | .000 | 0 | 0 | 1 | 0 | 0 | 11.12 | 4 |
| Hector Ocanas | 1930-1930 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Jim Ochs | 1907-1910 | .241 | 47 | 126 | 18 | 24 | 0 | 4.01 | 322 |
| Jim Ogan | 1904-1904 | .275 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Gene Olander | 1909-1917 | .183 | 3 | 20 | 21 | 52 | 6 | 4.98 | 414 |
| Ray Oldham | 1931-1933 | .264 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| John Olinde | 1924-1924 | .118 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Oliver | 1915-1915 | .300 | 0 | 0 | 1 | 3 | 0 | 8.20 | 23 |
| Ed Oliver | 1922-1923 | .118 | 0 | 3 | 15 | 18 | 1 | 4.33 | 180 |
| Tex Oliver | 1930-1933 | .283 | 20 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Ormsby | 1912-1912 | .000 | 0 | 0 | 0 | 0 | 0 | 9.53 | 10 |
| Don Orr | 1939-1943 | .143 | 0 | 2 | 5 | 5 | 4 | 1.98 | 59 |
| Pete Orr | 1920-1931 | .122 | 6 | 38 | 95 | 91 | 16 | 3.66 | 1519 |
| Johnny Ortiz | 1908-1908 | .000 | 0 | 0 | 1 | 0 | 0 | 4.50 | 9 |
| Sam Osborne | 1947-1947 | .360 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Osley | 1904-1906 | .147 | 0 | 11 | 18 | 34 | 3 | 5.01 | 123 |
| Rudy Osmond | 1917-1927 | .126 | 0 | 8 | 21 | 16 | 1 | 4.18 | 216 |
| Fernando Osuna | 1923-1923 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| John Outland | 1944-1944 | .279 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Presley Owen | 1904-1906 | .235 | 20 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Owens | 1944-1945 | .316 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Dick Owens | 1938-1938 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Frank Owens | 1941-1942 | .333 | 0 | 0 | 1 | 1 | 0 | 2.42 | 13 |
| Ken Owens | 1946-1947 | .286 | 0 | 0 | 0 | 4 | 1 | 4.03 | 28 |
| John Ozga | 1909-1909 | .000 | 0 | 0 | 7 | 8 | 16 | 2.65 | 22 |
