| Player | Date of Birth | Games | Subs | Goals |
| Callum O'Dowda | 23/04/1995 | 56 | 50 | 14 |
| Luke O'Brien | 11/09/1988 | 13 | 4 | 0 |
| Gatlin O'Donkor | 14/10/2004 | 10 | 29 | 2 |
| Adrian O'Dowd | 16/09/1959 | 9 | 2 | 1 |
| Cyril O'Sullivan | 22/02/1920 | 2 | 0 | 0 |
| Tony Obi | 15/09/1965 | 0 | 1 | 0 |
| Jon Obika | 12/09/1990 | 34 | 23 | 8 |
| Jordan Obika | 08/09/1993 | 9 | 6 | 1 |
| Bob Odell | 10/12/1934 | 65 | 0 | 3 |
| Eddie Odhiambo-Anaclet | 31/08/1985 | 79 | 6 | 6 |
| Yemi Odubade | 04/07/1984 | 87 | 71 | 31 |
| David Oldfield | 30/05/1968 | 24 | 13 | 3 |
| Eric Oldham | 27/06/1933 | 3 | 0 | 0 |
| Manny Omoyinmi | 28/12/1977 | 37 | 40 | 9 |
| Karleigh Osborne | 19/03/1988 | 6 | 0 | 0 |
| Derick Osei-Yaw | 10/09/1998 | 4 | 6 | 3 |
| Peter Otter | 58 | 0 | 0 |
Data correct to July 2023
