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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jong-gook O | 1979-1988 | 1 | 3 | .250 | 4.18 | 4 | 4 | 1 | 1 | 0 | 23.2 | 29 | 11 | 2 | 5 | 11 |
| Russ O'Fahy | 1989-1990 | 0 | 0 | .000 | 6.97 | 3 | 2 | 0 | 0 | 0 | 10.1 | 7 | 8 | 0 | 10 | 4 |
| Dwaine Ockey | 1969-1976 | 2 | 4 | .333 | 4.40 | 36 | 0 | 0 | 0 | 1 | 61.1 | 68 | 30 | 4 | 25 | 27 |
| Puck Oerlemans | 1967-1971 | 0 | 1 | .000 | 54.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 3 | 2 | 0 | 0 | 0 |
| Dan Ogburn | 1977-1987 | 1 | 3 | .250 | 6.75 | 15 | 0 | 0 | 0 | 0 | 13.1 | 14 | 10 | 1 | 6 | 7 |
| Paul Ogilvie | 1950-1957 | 1 | 0 | 1.000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 2.0 | 6 | 3 | 0 | 4 | 0 |
| Takakazu Ohayashi | 1972-1981 | 0 | 1 | .000 | 81.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 2 | 3 | 1 | 0 | 0 |
| Nobuhiko Okawa | 1934-1942 | 51 | 64 | .443 | 4.41 | 218 | 102 | 49 | 3 | 23 | 992.0 | 1127 | 486 | 76 | 370 | 345 |
| Anthony Okolita | 1915-1925 | 53 | 55 | .491 | 3.91 | 202 | 87 | 64 | 2 | 17 | 944.1 | 1050 | 410 | 34 | 288 | 254 |
| Julián Olivares | 1934-1949 | 57 | 92 | .383 | 4.39 | 256 | 143 | 63 | 3 | 18 | 1237.1 | 1553 | 604 | 60 | 392 | 346 |
| Lorenzo Olivarez | 1918-1924 | 40 | 41 | .494 | 4.12 | 143 | 62 | 49 | 3 | 9 | 688.2 | 753 | 315 | 25 | 281 | 169 |
| Bernard Ollivier | 1932-1937 | 51 | 62 | .451 | 4.56 | 124 | 115 | 81 | 2 | 0 | 952.1 | 1152 | 482 | 52 | 277 | 150 |
| Don Olsen | 1945-1945 | 4 | 7 | .364 | 5.65 | 23 | 10 | 5 | 0 | 0 | 110.0 | 136 | 69 | 8 | 59 | 54 |
| Manuel Olthuis | 1972-1974 | 7 | 12 | .368 | 4.23 | 38 | 38 | 1 | 0 | 0 | 191.1 | 199 | 90 | 13 | 101 | 69 |
| Amin Oluniide | 1981-1990 | 38 | 15 | .717 | 2.65 | 81 | 60 | 11 | 7 | 0 | 488.1 | 437 | 144 | 21 | 145 | 245 |
| Seinosuke Onishi | 1962-1963 | 6 | 14 | .300 | 3.93 | 26 | 26 | 9 | 1 | 0 | 190.0 | 169 | 83 | 22 | 109 | 179 |
| Juan Ortega | 1935-1944 | 5 | 6 | .455 | 4.15 | 89 | 6 | 2 | 0 | 3 | 173.2 | 211 | 80 | 10 | 98 | 64 |
| Anastasio Ortíz | 1980-1980 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 3.2 | 3 | 0 | 0 | 0 | 1 |
| Edgardo Ortíz | 1980-1981 | 0 | 1 | .000 | 5.11 | 5 | 0 | 0 | 0 | 0 | 12.1 | 22 | 7 | 0 | 0 | 2 |
| Edgardo Ortíz | 1937-1940 | 2 | 2 | .500 | 5.05 | 27 | 1 | 0 | 0 | 1 | 66.0 | 73 | 37 | 5 | 23 | 21 |
| Ricardo Ortíz | 1921-1921 | 0 | 1 | .000 | 8.53 | 3 | 0 | 0 | 0 | 0 | 6.1 | 8 | 6 | 1 | 3 | 2 |
| Tsuginori Osada | 1983-1990 | 8 | 6 | .571 | 4.21 | 62 | 1 | 0 | 0 | 4 | 139.0 | 140 | 65 | 14 | 45 | 102 |
| Humphrey Osman | 1950-1951 | 4 | 9 | .308 | 6.36 | 25 | 16 | 0 | 0 | 0 | 126.0 | 175 | 89 | 17 | 47 | 41 |
| Félix Osorio | 1961-1969 | 19 | 24 | .442 | 5.00 | 61 | 48 | 11 | 1 | 1 | 361.2 | 421 | 201 | 64 | 111 | 146 |
| Jim Ostrom | 1911-1911 | 8 | 10 | .444 | 4.99 | 20 | 20 | 11 | 0 | 0 | 157.0 | 158 | 87 | 15 | 88 | 35 |
| Francisco Otero | 1924-1924 | 2 | 8 | .200 | 5.74 | 15 | 11 | 6 | 0 | 1 | 91.0 | 118 | 58 | 7 | 46 | 21 |
| Bryan Oulton | 1961-1966 | 25 | 25 | .500 | 3.53 | 71 | 71 | 13 | 3 | 0 | 473.2 | 435 | 186 | 50 | 168 | 363 |
| Urs Oversluizen | 1971-1984 | 7 | 15 | .318 | 3.99 | 71 | 30 | 1 | 0 | 2 | 252.2 | 249 | 112 | 12 | 159 | 116 |
| Craig Overy | 1938-1941 | 39 | 27 | .591 | 4.27 | 100 | 57 | 31 | 1 | 5 | 563.1 | 542 | 267 | 37 | 294 | 280 |
| Helge Ovsienko | 1987-1990 | 10 | 7 | .588 | 2.84 | 45 | 23 | 3 | 2 | 0 | 218.1 | 188 | 69 | 9 | 37 | 121 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Hirokichi Ozawa | 1947-1958 | 97 | 104 | .483 | 3.84 | 303 | 208 | 104 | 16 | 19 | 1793.2 | 1739 | 765 | 158 | 649 | 773 |
