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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bob O'Brien | 1972-1974 | .000 | 0 | 0 | 3 | 2 | 0 | 5.85 | 48 |
| Kenneth O'Brien | 1976-1976 | .201 | 2 | 20 | 0 | 0 | 0 | 0.00 | 1 |
| Kenneth O'Brien | 1975-1975 | .000 | 0 | 0 | 1 | 2 | 2 | 5.76 | 25 |
| Larry O'Brien | 1975-1975 | .235 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Pete M O'Brien | 1980-1980 | .262 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Rodney O'Brien | 1971-1975 | .280 | 9 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Syd O'Brien | 1971-1971 | .367 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jack W O'Connor | 1977-1980 | .000 | 0 | 0 | 7 | 10 | 1 | 4.27 | 145 |
| Thomas O'Connor | 1971-1971 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Richard O'Daniels | 1972-1976 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Dell | 1972-1977 | .301 | 1 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Thomas O'Donnell | 1976-1976 | .000 | 0 | 0 | 0 | 5 | 0 | 8.87 | 25 |
| Tim O'Hara | 1973-1977 | .210 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick O'Keefe | 1970-1973 | .182 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Malley | 1978-1978 | .667 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry O'Neill | 1979-1980 | .000 | 0 | 0 | 3 | 3 | 16 | 2.55 | 63 |
| Paul O'Neill | 1980-1980 | .207 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Theodore O'Neill | 1979-1979 | .000 | 0 | 0 | 4 | 1 | 1 | 5.68 | 41 |
| John O'Rear | 1971-1978 | .248 | 10 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Evan O'Rourke | 1972-1978 | .000 | 0 | 0 | 11 | 11 | 0 | 5.01 | 150 |
| Denny O'Toole | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 2.61 | 11 |
| Johnny Oates | 1970-1970 | .280 | 5 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Oberkfell | 1975-1977 | .265 | 2 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Benjamin Ochoa | 1971-1975 | .000 | 0 | 0 | 28 | 7 | 0 | 2.96 | 283 |
| Raymie Odermott | 1980-1980 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Ron Oester | 1973-1974 | .263 | 0 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Rowland Office | 1970-1971 | .310 | 6 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| John Ogden | 1978-1978 | .000 | 0 | 0 | 0 | 4 | 0 | 4.08 | 22 |
| Ron Oglesby | 1973-1974 | .000 | 0 | 0 | 5 | 3 | 0 | 3.34 | 74 |
| Bob Ojeda | 1977-1980 | .000 | 0 | 0 | 9 | 16 | 14 | 5.10 | 136 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Oswaldo Olivares | 1972-1976 | .200 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Oliver | 1972-1973 | .240 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Blake Olsen | 1975-1975 | .137 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Lew Olsen | 1975-1975 | .000 | 0 | 0 | 5 | 2 | 0 | 3.86 | 68 |
| William Olsen | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 5 | 1.93 | 4 |
| Clinton Olson | 1970-1975 | .000 | 0 | 0 | 2 | 4 | 3 | 4.83 | 77 |
| Dean Olson | 1976-1976 | .000 | 0 | 0 | 1 | 1 | 0 | 6.00 | 7 |
| Eddie Olson | 1973-1973 | .259 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Olson | 1977-1977 | .198 | 2 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Mitchell Olson | 1973-1973 | .000 | 0 | 0 | 1 | 3 | 0 | 4.50 | 20 |
| Ed Olszta | 1973-1977 | .202 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Omo | 1977-1978 | .000 | 0 | 0 | 13 | 9 | 0 | 3.44 | 162 |
| Michael Ongarato | 1975-1976 | .218 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Oppenheimer | 1975-1975 | .219 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Oquendo | 1978-1978 | .238 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Herbert Orensky | 1979-1980 | .143 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Oriani | 1973-1973 | .292 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Maury Ornest | 1979-1979 | .188 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Ornest | 1976-1976 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| James Oros | 1980-1980 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesse Orosco | 1978-1979 | .000 | 0 | 0 | 1 | 2 | 1 | 4.43 | 13 |
| Tony Orrego | 1975-1976 | .000 | 0 | 0 | 4 | 8 | 1 | 9.07 | 38 |
| Jorge Orta | 1971-1971 | .369 | 8 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Ortega | 1972-1975 | .000 | 0 | 0 | 9 | 10 | 0 | 2.95 | 227 |
| Frank Ortenzio | 1970-1976 | .259 | 14 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Albert Ortiz | 1978-1978 | .201 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortiz | 1976-1980 | .173 | 1 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortiz | 1980-1980 | .178 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Hector Ortiz | 1976-1976 | .208 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Ortiz | 1977-1979 | .000 | 0 | 0 | 3 | 5 | 22 | 3.29 | 49 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jose L Ortiz | 1971-1971 | .281 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Junior Ortiz | 1980-1980 | .238 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Monte Ortiz | 1974-1974 | .154 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 1971-1971 | .000 | 0 | 0 | 0 | 0 | 2 | 6.75 | 5 |
| Osvaldo Ortiz | 1972-1972 | .083 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Raul Ortiz | 1980-1980 | .000 | 0 | 0 | 0 | 1 | 1 | 2.67 | 28 |
| Jeffrey Orville | 1978-1979 | .000 | 0 | 0 | 1 | 10 | 0 | 4.17 | 61 |
| Ozzie Osborn | 1975-1975 | .000 | 0 | 0 | 1 | 0 | 0 | 5.00 | 5 |
| William Osborne | 1974-1974 | .000 | 0 | 0 | 3 | 0 | 1 | 7.51 | 30 |
| Bob Osentoski | 1973-1979 | .191 | 5 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Osmanski | 1972-1972 | .000 | 0 | 0 | 0 | 0 | 0 | 4.26 | 13 |
| Brian Ostrosser | 1970-1971 | .228 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Ott | 1970-1973 | .250 | 3 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Ouellette | 1980-1980 | .203 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Overy | 1972-1976 | .000 | 0 | 0 | 7 | 13 | 22 | 3.80 | 132 |
| Bob Owchinko | 1976-1978 | .000 | 0 | 0 | 1 | 1 | 0 | 4.15 | 13 |
| Larry Owen | 1977-1977 | .214 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| John Owens | 1971-1972 | .207 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Owens | 1977-1980 | .000 | 0 | 0 | 11 | 7 | 0 | 3.98 | 122 |
