| Player | Position | Last Season | Birthdate | Country |
| O'Connor, Buddy | C | 1950-1951 | 06/21/1916 | CAN |
| Oatman, Russell | L | 1928-1929 | 02/19/1905 | CAN |
| Ogrodnick, John | L | 1992-1993 | 06/20/1959 | CAN |
| Olczyk, Eddie | R | 1999-2000 | 08/16/1966 | USA |
| Olesevich, Dan | G | 1961-1962 | 09/16/1937 | CAN |
| Oliver, David | R | 2005-2006 | 04/17/1971 | CAN |
| Oliwa, Krzysztof | L | 2005-2006 | 04/12/1973 | POL |
| Orr, Colton | R | 2012-2013 | 03/03/1982 | CAN |
| Ortmeyer, Jed | R | 2011-2012 | 09/03/1978 | USA |
| Osborne, Mark | L | 1994-1995 | 08/13/1961 | CAN |
| Ozolinsh, Sandis | D | 2007-2008 | 08/03/1972 | LVA |