| Returned 62 results | |||
| Player | Most Recent Team | Birth Date | Hometown |
|---|---|---|---|
| Doug O'Brien (LD) | HUL | Dec. 30, 1899 | |
| Craig O'Brien (C) | PBO | Dec. 30, 1899 | |
| Drew O'Connell (RW) | ER | Oct. 24, 1984 | Cold Spring Harbor, NY, USA |
| Chris O'Donnell (C) | OSH | Dec. 30, 1899 | |
| Alain O'Driscoll (D) | MTL | Dec. 18, 1979 | |
| Ryan O'Keefe (D) | PLY | Feb. 5, 1980 | Mississauga, ON |
| Nathan O'Nabigon (LW) | KIT | May. 9, 1983 | Longlac, ON |
| Kyle O'Neil (C) | LDN | Mar. 1, 1985 | |
| Patrick O'Sullivan (C) | NIAG | Feb. 1, 1985 | Winston Salem, NC, USA |
| Sean O'Sullivan () | KIT | ||
| Joshua Ocampo (RW) | OS | Jul. 12, 1991 | Brampton, ON |
| Cameron Odam (D) | KGN | Jun. 26, 1990 | Stittsville, ON |
| Johnny Oduya (RD) | VIC | Dec. 30, 1899 | |
| Jordan Ogilvie (D) | SAG | Mar. 3, 1989 | Ancaster, ON |
| Andrew Oke (C) | SAR | Dec. 30, 1899 | |
| Mick Okrzesik (D) | GUE | Jan. 21, 1985 | Houston, TX, USA |
| Justin Olden (RW) | LDN | Apr. 19, 1982 | Scarborough, ON |
| Mathis Olimb (LW) | SAR | Feb. 1, 1986 | Oslo, Nor, Norway |
| Brett Oliphant (RW) | SAR | Feb. 26, 1988 | Wheatley, ON |
| Mike Oliveira (C) | NIAG | Feb. 21, 1979 | |
| Michaud Olivier (G) | SHA | ||
| Erik Olsen (D) | KGN | Dec. 16, 1977 | |
| Richard Olsen (G) | GUE | Apr. 23, 1982 | Belleville, ON |
| Christian Olsen (LW) | ER | Oct. 8, 1987 | Herlev, DEN, Denmark |
| Cam Ondrik (G) | RD | Dec. 30, 1899 | |
| Andrew Onorati (G) | MISS | ||
| Phil Oreskovic (D) | OS | Jan. 26, 1987 | Brampton, ON |
| Victor Oreskovich (C) | KIT | Aug. 15, 1986 | Oakville, ON |
| Brett Ormond (LD) | NIAG | Feb. 4, 1980 | |
| Blake Orr (D) | BELV | Apr. 11, 1982 | |
| Oskar Osala (LW) | NIAG | Dec. 26, 1987 | Vaasa, FIN, Finland |
| Matt Osborne (D) | NB | Feb. 13, 1978 | |
| Tyler Osborne (D) | GUE | Feb. 3, 1991 | Florissant, MO |
| John Osborne (LW) | KIT | Mar. 11, 1981 | |
| Chris Osborne (LW) | NIAG | Feb. 11, 1982 | Elmira, ON |
| Luke Oshell (G) | NB | Jan. 13, 1983 | |
| Eric Ostrander (G) | BELV | Dec. 30, 1899 | |
| Radim Ostrcil (LD) | OTT | Jan. 15, 1989 | Vsetin, Czech. Rep. |
| Ondrej Otcenas (C) | PLY | Mar. 6, 1987 | Piestany, SVA |
| Steve Ott (C) | WSR | Aug. 19, 1982 | Stoney Point, ON |
| Pat Ouellette (C) | OTT | Apr. 21, 1987 | Tecumseh, ON |
| Ryan Oulahen (C) | BRA | Mar. 26, 1985 | Newmarket, ON |
| Michael Ouzas (G) | OS | Aug. 30, 1985 | Hamilton, ON |
| Shane Owen (G) | ER | Jun. 4, 1990 | Shanty Bay, ON |
| Jordan Owens (LW) | NIAG | May. 1, 1986 | Niagara Falls, ON |
| Philippe Ozga (G) | ACA | Jul. 31, 1980 | |
| Corey O'Brien (RW) | PBO | Mar. 6, 1990 | Peterborough, ON |
| Shane O'Brien (D) | MISS | Aug. 9, 1983 | Port Hope, ON |
| Ryan O'Connor (D) | Jan. 12, 1992 | Hamilton, ON | |
| Sean O'Connor (C) | LDN | Jan. 31, 1987 | Brownstown, MI |
| Ben O'Connor (D) | NIAG | Dec. 21, 1988 | Sheffield, ENG, England |
| Eric O'Dell (C) | SBY | Jun. 21, 1990 | Ottawa, ON |
| Conor O'Donnell (LW) | GUE | Nov. 17, 1989 | Hamilton, ON |
| Bryce O'Hagan (G) | SSM | Dec. 27, 1991 | Burlington, ON |
| Mark O'Leary (LW) | GUE | Jan. 21, 1985 | Owen Sound, ON |
| Ryan O'Marra (C) | WEST | Jun. 9, 1987 | Mississauga, ON |
| Alex O'Neil (LW) | BRA | Jun. 4, 1992 | Kemptville, ON |
| Dylan O'Neil (C) | MISS | Oct. 2, 1990 | Ajax, ON |
| Jordon O'Neill (D) | PLY | Jan. 11, 1990 | London, ON |
| Ben O'Quinn (C) | SAR | May. 7, 1991 | Woodstock, ON |
| Ryan O'Reilly (C) | ER | Feb. 7, 1991 | Varna, ON |
| Cal O'Reilly (C) | WSR | Sep. 30, 1986 | Seaforth, ON |
