A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | R | S | T | U | V | W | Y | Z
| Jack O'Brien | Dan Obrist | Kevin O'Connell | Don O'Dell |
| Joe Bill O'Dell | Rick O'Dell | Larry Odo | Randy Ogden |
| Don Oldenberg | Jack Oldenhage | Barney Oldfield | Charles Oldham |
| Jackie Oliver | Jerry Oliver | Budd Olsen | Mike Olsen |
| Bill Olson | Keith Olson | Ollie Olson | Jerry O'Neil |
| Jan Opperman | Jim Ord | Bobby Ore | Gib Orr |
| Phil Orr | Red Ortwein | Bill Osborne | Bill Osborne |
| Bob Osborne | George Osborne | Johnny Osteen | Don Ostendorf |
| Billy Oswald | Nelson Oswald | L.D. Ottinger | Frank Oviado |
| Cotton Owens |
