| Player | Position | Last Season | Birthdate | Country |
| O'Byrne, Ryan | D | 2012-2013 | 07/19/1984 | CAN |
| O'Connor, Buddy | C | 1950-1951 | 06/21/1916 | CAN |
| O'Neil, Jim | C | 1941-1942 | 04/03/1913 | CAN |
| Odelein, Lyle | D | 2005-2006 | 07/21/1968 | CAN |
| Odjick, Gino | L | 2001-2002 | 09/07/1970 | CAN |
| Olmstead, Bert | L | 1961-1962 | 09/04/1926 | CAN |
| Orleski, David | D | 1981-1982 | 12/26/1959 | CAN |