| Player | Position | Last Season | Birthdate | Country |
| O'Connell, Michael | D | 1989-1990 | 11/25/1955 | USA |
| Oates, Adam | C | 2003-2004 | 08/27/1962 | CAN |
| Oatman, Russell | L | 1928-1929 | 02/19/1905 | CAN |
| Odrowski, Gerry | D | 1971-1972 | 10/04/1938 | CAN |
| Ogrodnick, John | L | 1992-1993 | 06/20/1959 | CAN |
| Olausson, Fredrik | D | 2002-2003 | 10/05/1966 | SWE |
| Oliver, Murray | C | 1974-1975 | 11/14/1937 | CAN |
| Olson, Dennis | C | 1957-1958 | 11/09/1934 | CAN |
| Orlando, Jimmy | D | 1942-1943 | 02/27/1916 | CAN |
| Osborne, Mark | L | 1994-1995 | 08/13/1961 | CAN |
| Osgood, Chris | G | 2010-2011 | 11/26/1972 | CAN |