| Player Name | Pos. | Birthdate | Birthplace | Seasons | GP | G | A | Pts | PIM | Yrs. |
|---|---|---|---|---|---|---|---|---|---|---|
| Dennis O'Brien | D | 06/10/1949 | Port Hope, ONT | 1970-1980 | 592 | 31 | 91 | 122 | 1017 | 10 |
| Doug O'Brien | D | 02/16/1984 | St. John's, NFLD | 2005-2006 | 5 | 0 | 0 | 0 | 2 | 1 |
| Ellard "Obie" O'Brien | D | 05/27/1930 | St. Catharines, ONT | 1955-1956 | 2 | 0 | 0 | 0 | 0 | 1 |
| Jim O'Brien | C | 01/29/1989 | Maplewood, MN | 2010-2018 | 77 | 8 | 5 | 13 | 16 | 5 |
| Liam O'Brien | C | 07/29/1994 | Halifax, NS | 2014-2024 | 199 | 11 | 22 | 33 | 441 | 7 |
| Shane O'Brien | D | 08/09/1983 | Port Hope, ONT | 2006-2015 | 537 | 13 | 79 | 92 | 916 | 9 |
| Ryan O'Byrne | D | 07/19/1984 | Victoria, BC | 2007-2013 | 308 | 5 | 34 | 39 | 369 | 6 |
| Jack O'Callahan | D | 07/24/1957 | Charlestown, MA | 1982-1989 | 389 | 27 | 104 | 131 | 541 | 7 |
| Mike O'Connell | D | 11/25/1955 | Chicago, IL | 1977-1990 | 860 | 105 | 335 | 440 | 605 | 13 |
| Drew O'Connor | L | 06/09/1998 | Chatham, NJ | 2020-2024 | 157 | 24 | 26 | 50 | 38 | 4 |
| Herbert "Buddy" O'Connor | C | 06/21/1916 | Montreal, PQ | 1941-1951 | 509 | 140 | 257 | 397 | 34 | 10 |
| Logan O'Connor | R | 08/14/1996 | Missouri City, TX | 2018-2024 | 263 | 35 | 47 | 82 | 117 | 6 |
| Matt O'Connor | G | 02/14/1992 | Sault Ste. Marie, ONT | 2015-2016 | 1 | 0 | 0 | 0 | 0 | 1 |
| Myles O'Connor | D | 04/02/1967 | Calgary, ALTA | 1990-1994 | 43 | 3 | 4 | 7 | 69 | 4 |
| Eric O'Dell | C | 06/21/1990 | Ottawa, ONT | 2013-2015 | 41 | 3 | 5 | 8 | 29 | 2 |
| Fred O'Donnell | L | 12/06/1949 | Kingston, ONT | 1972-1974 | 115 | 15 | 11 | 26 | 98 | 2 |
| Sean O'Donnell | D | 10/13/1971 | Ottawa, ONT | 1994-2012 | 1224 | 31 | 198 | 229 | 1809 | 17 |
| Don O'Donoghue | F | 08/27/1949 | Kingston, ONT | 1969-1972 | 125 | 18 | 17 | 35 | 35 | 3 |
| Billy O'Dwyer | F | 01/25/1960 | South Boston, MA | 1983-1990 | 120 | 9 | 13 | 22 | 108 | 5 |
| Gerry O'Flaherty | R | 08/31/1950 | Pittsburgh, PA | 1971-1979 | 438 | 99 | 95 | 194 | 168 | 8 |
| John "Peanuts" O'Flaherty | L | 04/10/1918 | Toronto, ONT | 1940-1942 | 21 | 5 | 1 | 6 | 0 | 2 |
| Rob O'Gara | D | 07/06/1993 | Massapequa, NY | 2016-2018 | 33 | 0 | 3 | 3 | 6 | 2 |
| George O'Grady | 1917-1918 | 4 | 0 | 0 | 0 | 0 | 1 | |||
| Ryan O'Marra | C | 06/09/1987 | Tokyo, Japan | 2009-2012 | 33 | 1 | 6 | 7 | 17 | 3 |
| Paul O'Neil | C | 08/24/1953 | Boston, MA | 1973-1976 | 6 | 0 | 0 | 0 | 0 | 2 |
| Brian O'Neill | R | 06/01/1988 | Yardley, PA | 2015-2016 | 22 | 0 | 2 | 2 | 8 | 1 |
| Jeff O'Neill | C | 02/23/1976 | King City, ONT | 1995-2007 | 821 | 237 | 259 | 496 | 670 | 11 |
| Jim "Peggy" O'Neill | R | 04/03/1912 | Semans, SASK | 1933-1942 | 165 | 6 | 30 | 36 | 109 | 6 |
| Mike O'Neill | G | 11/03/1967 | Montreal, PQ | 1991-1997 | 21 | 0 | 0 | 0 | 0 | 4 |
| Tom "Windy" O'Neill | 1943-1945 | 66 | 10 | 12 | 22 | 53 | 2 | |||
| Wes O'Neill | D | 03/03/1986 | Essex, ONT | 2008-2010 | 5 | 0 | 0 | 0 | 6 | 2 |
| Will O'Neill | D | 04/28/1988 | Salem, MA | 2017-2018 | 1 | 0 | 0 | 0 | 0 | 1 |
| Willie O'Ree | R | 10/15/1935 | Fredericton, NB | 1957-1961 | 45 | 4 | 10 | 14 | 26 | 2 |
| Danny O'Regan | C | 01/30/1994 | Berlin, Germany | 2016-2022 | 30 | 1 | 5 | 6 | 2 | 4 |
| Tom O'Regan | F | 12/29/1961 | Cambridge, MA | 1983-1986 | 61 | 5 | 12 | 17 | 10 | 3 |
| Cal O'Reilly | C | 09/30/1986 | Toronto, ONT | 2008-2018 | 145 | 16 | 33 | 49 | 14 | 7 |
| Ryan O'Reilly | C | 02/07/1991 | Clinton, ONT | 2009-2024 | 1073 | 282 | 489 | 771 | 170 | 15 |
| Terry O'Reilly | R | 06/07/1951 | Niagara Falls, ONT | 1971-1985 | 891 | 204 | 402 | 606 | 2095 | 14 |
| Danny O'Shea | C | 06/15/1945 | Ajax, ONT | 1968-1973 | 369 | 64 | 115 | 179 | 265 | 5 |
| Kevin O'Shea | F | 05/28/1947 | Toronto, ONT | 1970-1973 | 134 | 13 | 18 | 31 | 85 | 3 |
| Chris O'Sullivan | D | 05/15/1974 | Dorchester, MA | 1996-2003 | 62 | 2 | 17 | 19 | 16 | 5 |
| Patrick O'Sullivan | L | 02/01/1985 | Toronto, ONT | 2006-2012 | 334 | 58 | 103 | 161 | 116 | 6 |
| Adam Oates | C | 08/27/1962 | Weston, ONT | 1985-2004 | 1337 | 341 | 1079 | 1420 | 415 | 19 |
| Russell Oatman | L | 02/19/1905 | Tillsonburg, ONT | 1926-1929 | 121 | 20 | 9 | 29 | 100 | 3 |
| Evan Oberg | D | 02/16/1988 | Forestburg, ALTA | 2009-2012 | 7 | 0 | 0 | 0 | 0 | 3 |
| Jaroslav Obsut | D | 09/03/1976 | Presov, Slovakia | 2000-2002 | 7 | 0 | 0 | 0 | 2 | 2 |
| Chris Oddleifson | R | 09/07/1950 | Brandon, MAN | 1972-1981 | 524 | 95 | 191 | 286 | 464 | 9 |
| Lyle Odelein | D | 07/21/1968 | Quill Lake, SASK | 1989-2006 | 1056 | 50 | 202 | 252 | 2316 | 16 |
| Selmar Odelein | D | 04/11/1966 | Quill Lake, SASK | 1985-1989 | 18 | 0 | 2 | 2 | 35 | 3 |
| Jeff Odgers | R | 05/31/1969 | Spy Hill, SASK | 1991-2003 | 821 | 75 | 70 | 145 | 2364 | 12 |
| Gino Odjick | L | 09/07/1970 | Maniwaki, PQ | 1990-2002 | 605 | 64 | 73 | 137 | 2567 | 12 |
| Gerry Odrowski | D | 10/04/1938 | Trout Creek, ONT | 1960-1972 | 309 | 12 | 19 | 31 | 111 | 6 |
| Johnny Oduya | D | 10/01/1981 | Stockholm, Sweden | 2006-2018 | 850 | 41 | 149 | 190 | 372 | 12 |
| Jordan Oesterle | D | 06/25/1992 | Dearborn Heights, MI | 2014-2024 | 371 | 19 | 67 | 86 | 71 | 10 |
| Jake Oettinger | G | 12/18/1998 | Lakeville, MN | 2019-2024 | 193 | 0 | 4 | 4 | 8 | 5 |
| Brian Ogilvie | F | 01/30/1952 | Stettler, ALTA | 1972-1979 | 90 | 15 | 21 | 36 | 29 | 6 |
| John Ogrodnick | R | 06/20/1959 | Edmonton, ALTA | 1979-1993 | 928 | 402 | 425 | 827 | 260 | 14 |
| Liam Ohgren | L | 01/28/2004 | Stockholm, Sweden | 2023-2024 | 4 | 1 | 1 | 2 | 0 | 1 |
| Mattias Ohlund | D | 09/09/1976 | Pitea, Sweden | 1997-2011 | 909 | 93 | 250 | 343 | 885 | 13 |
| Janne Ojanen | C | 04/09/1968 | Tampere, Finland | 1988-1993 | 98 | 21 | 23 | 44 | 28 | 4 |
| Todd Okerlund | R | 09/06/1964 | Burnsville, MN | 1987-1988 | 4 | 0 | 0 | 0 | 2 | 1 |
| Nikita Okhotyuk | D | 12/04/2000 | Chelyabinsk, Russia | 2021-2024 | 67 | 3 | 9 | 12 | 52 | 3 |
| Kyle Okposo | R | 04/16/1988 | St. Paul, MN | 2007-2024 | 1051 | 242 | 372 | 614 | 554 | 17 |
| Roman Oksiuta | R | 08/21/1970 | Murmansk, Russia | 1993-1997 | 153 | 46 | 41 | 87 | 100 | 4 |
| Fredrik Olausson | D | 10/05/1966 | Dadesjo, Sweden | 1986-2003 | 1022 | 147 | 434 | 581 | 452 | 16 |
| Oskar Olausson | R | 11/10/2002 | Stockholm, Sweden | 2022-2024 | 2 | 0 | 0 | 0 | 0 | 2 |
| Ed Olczyk | C | 08/16/1966 | Chicago, IL | 1984-2000 | 1031 | 342 | 452 | 794 | 874 | 16 |
| Jamie Oleksiak | D | 12/21/1992 | Toronto, ONT | 2012-2024 | 598 | 36 | 93 | 129 | 453 | 12 |
| Steven Oleksy | D | 02/04/1986 | Chesterfield, MI | 2012-2017 | 73 | 3 | 17 | 20 | 110 | 4 |
| Bill Oleschuk | G | 07/20/1955 | Edmonton, ALTA | 1975-1980 | 55 | 0 | 0 | 0 | 14 | 4 |
| Danny Olesevich | G | Port Colborne, ONT | 1961-1962 | 1 | 0 | 0 | 0 | 0 | 1 | |
| Rostislav Olesz | L | 10/10/1985 | Bilovec, Czech Rep. | 2005-2014 | 365 | 57 | 77 | 134 | 118 | 8 |
| David Oliver | R | 04/17/1971 | Sechelt, BC | 1994-2006 | 233 | 49 | 49 | 98 | 84 | 9 |
| Harry Oliver | R | 10/26/1900 | Selkirk, MAN | 1926-1937 | 472 | 127 | 85 | 212 | 147 | 11 |
| Murray Oliver | C | 11/14/1937 | Hamilton, ONT | 1957-1975 | 1127 | 274 | 454 | 728 | 319 | 17 |
| Mathieu Olivier | R | 02/11/1997 | Biloxi, MS | 2019-2024 | 168 | 13 | 21 | 34 | 239 | 5 |
| Krzysztof Oliwa | L | 04/12/1973 | Tychy, Poland | 1996-2006 | 410 | 17 | 28 | 45 | 1447 | 9 |
| Bert Olmstead | R | 09/04/1926 | Scepter, SASK | 1948-1962 | 848 | 181 | 421 | 602 | 884 | 14 |
| Fredrik Olofsson | L | 05/27/1996 | Helsingborg, Sweden | 2022-2024 | 85 | 4 | 9 | 13 | 10 | 2 |
| Gustav Olofsson | D | 12/01/1994 | Boras, Sweden | 2015-2024 | 63 | 0 | 11 | 11 | 18 | 6 |
| Victor Olofsson | L | 07/18/1995 | Ornskoldsvik, Sweden | 2018-2024 | 314 | 90 | 92 | 182 | 28 | 6 |
| Darryl Olsen | D | 10/07/1966 | Calgary, ALTA | 1991-1992 | 1 | 0 | 0 | 0 | 0 | 1 |
| Dylan Olsen | D | 01/03/1991 | Calgary, ALTA | 2011-2016 | 124 | 5 | 17 | 22 | 36 | 4 |
| Dennis Olson | C | 11/09/1934 | Kenora, ONT | 1957-1958 | 4 | 0 | 0 | 0 | 0 | 1 |
| Josh Olson | L | 07/13/1981 | Fargo, ND | 2003-2004 | 5 | 1 | 0 | 1 | 0 | 1 |
| Christer Olsson | D | 07/24/1970 | Arbiga, Sweden | 1995-1997 | 56 | 4 | 12 | 16 | 24 | 2 |
| Peter Olvecky | C | 10/11/1985 | Nove Zamky, Slovakia | 2008-2010 | 32 | 2 | 5 | 7 | 12 | 2 |
| Mark Olver | C | 01/01/1988 | Burnaby, BC | 2010-2013 | 74 | 10 | 12 | 22 | 39 | 3 |
| Jimmie Olvestad | R | 02/16/1980 | Stockholm, Sweden | 2001-2003 | 111 | 3 | 14 | 17 | 40 | 2 |
| Linus Omark | L | 02/05/1987 | Overtornea, Sweden | 2010-2014 | 79 | 8 | 24 | 32 | 40 | 3 |
| Ben Ondrus | R | 06/25/1982 | Sherwood Park, ALTA | 2005-2009 | 52 | 0 | 2 | 2 | 77 | 4 |
| Bill Orban | L | 09/10/1939 | Regina, SASK | 1967-1970 | 114 | 8 | 15 | 23 | 67 | 3 |
| Phil Oreskovic | D | 01/26/1987 | Brampton, ONT | 2008-2009 | 10 | 1 | 1 | 2 | 21 | 1 |
| Victor Oreskovich | R | 08/15/1986 | Whitby, ONT | 2009-2012 | 67 | 2 | 7 | 9 | 41 | 3 |
| Gates Orlando | F | 11/16/1962 | Montreal, PQ | 1984-1987 | 98 | 18 | 26 | 44 | 51 | 3 |
| Jimmy Orlando | D | 02/27/1910 | Montreal, PQ | 1936-1943 | 200 | 6 | 25 | 31 | 375 | 6 |
| Dave Orleski | L | 12/26/1959 | Edmonton, ALTA | 1980-1982 | 2 | 0 | 0 | 0 | 0 | 2 |
| Dmitri Orlov | D | 07/23/1991 | Novokuznetsk, Russia | 2011-2024 | 791 | 70 | 229 | 299 | 327 | 12 |
| Brooks Orpik | D | 09/26/1980 | San Francisco, CA | 2002-2019 | 1035 | 18 | 176 | 194 | 972 | 16 |
| Bobby Orr | D | 03/20/1948 | Parry Sound, ONT | 1966-1979 | 657 | 270 | 645 | 915 | 953 | 12 |
| Colton Orr | R | 03/03/1982 | Winnipeg, MAN | 2003-2015 | 477 | 12 | 12 | 24 | 1186 | 11 |
| Vladimir Orszagh | R | 05/24/1977 | Banska Bystrica, Slovakia | 1997-2006 | 289 | 54 | 65 | 119 | 194 | 7 |
| Joni Ortio | G | 04/16/1991 | Turku, Finland | 2013-2016 | 37 | 0 | 2 | 2 | 2 | 3 |
| Jed Ortmeyer | R | 09/03/1978 | Omaha, NE | 2003-2012 | 345 | 22 | 31 | 53 | 161 | 8 |
| Oskar Osala | L | 12/26/1987 | Vaasa, Finland | 2008-2010 | 3 | 0 | 0 | 0 | 0 | 2 |
| Keith Osborne | R | 04/02/1969 | Toronto, ONT | 1989-1993 | 16 | 1 | 3 | 4 | 16 | 2 |
| Mark Osborne | L | 08/13/1961 | Toronto, ONT | 1981-1995 | 919 | 212 | 319 | 531 | 1152 | 14 |
| Randy Osburn | F | 11/26/1952 | Collingwood, ONT | 1972-1975 | 27 | 0 | 2 | 2 | 0 | 2 |
| Chris Osgood | G | 11/26/1972 | Peace River, ALTA | 1993-2011 | 744 | 1 | 19 | 20 | 137 | 17 |
| T.J. Oshie | R | 12/23/1986 | Everett, WA | 2008-2024 | 1010 | 302 | 393 | 695 | 541 | 16 |
| Mark Osiecki | D | 07/23/1968 | St. Paul, MN | 1991-1993 | 93 | 3 | 11 | 14 | 43 | 2 |
| Zack Ostapchuk | C | 05/29/2003 | St. Albert, ALTA | 2023-2024 | 7 | 0 | 0 | 0 | 0 | 1 |
| Jaroslav Otevrel | L | 09/16/1968 | Zlin, Czech | 1992-1994 | 16 | 3 | 4 | 7 | 2 | 2 |
| Brennan Othmann | L | 01/05/2003 | Pickering, ONT | 2023-2024 | 3 | 0 | 0 | 0 | 0 | 1 |
| Steve Ott | C | 08/19/1982 | Summerside, PEI | 2002-2017 | 848 | 109 | 179 | 288 | 1555 | 14 |
| Joel Otto | C | 10/29/1961 | St. Cloud, MN | 1984-1998 | 943 | 195 | 313 | 508 | 1934 | 14 |
| Maxime Ouellet | G | 06/17/1981 | Beauport, PQ | 2000-2006 | 12 | 0 | 1 | 1 | 2 | 3 |
| Michel Ouellet | R | 03/05/1982 | Rimouski, PQ | 2005-2009 | 190 | 52 | 64 | 116 | 58 | 4 |
| Xavier Ouellet | D | 07/29/1993 | Bayonne, France | 2013-2021 | 178 | 5 | 23 | 28 | 82 | 8 |
| Eddie Ouellette | L | 03/09/1911 | Ottawa, ONT | 1935-1936 | 43 | 3 | 2 | 5 | 11 | 1 |
| Gerry Ouellette | R | 11/01/1938 | Grand Falls, NB | 1960-1961 | 34 | 5 | 4 | 9 | 0 | 1 |
| Ted Ouimet | G | 07/06/1947 | Rouyn-Noranda, PQ | 1968-1969 | 1 | 0 | 0 | 0 | 0 | 1 |
| Alex Ovechkin | L | 09/17/1985 | Moscow, Russia | 2005-2024 | 1426 | 853 | 697 | 1550 | 817 | 19 |
| Dennis Owchar | D | 03/28/1953 | Dryden, ONT | 1974-1980 | 288 | 30 | 85 | 115 | 200 | 6 |
| George Owen | D | Hamilton, ONT | 1928-1933 | 192 | 44 | 33 | 77 | 151 | 5 | |
| Nathan Oystrick | D | 12/17/1982 | Regina, SASK | 2008-2011 | 65 | 5 | 10 | 15 | 61 | 3 |
| Igor Ozhiganov | D | 10/13/1992 | Krasnogorsk, Russia | 2018-2019 | 53 | 3 | 4 | 7 | 14 | 1 |
| Sandis Ozolinsh | D | 08/03/1972 | Riga, Latvia | 1992-2008 | 875 | 167 | 397 | 564 | 638 | 15 |
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