| Oakes, Corey | WPG | DB | I | 2003 | 29 | Robert Morris College | 5.10 | 203 | Feb. 12, 1979 | Pittsburgh, PA | More | |
| Oakley | SMC | G | 1932 | |||||||||
| Oates, Tommy | BIRM | DB | I | 1995 | 23 | Union College | 5.09 | 170 | Nov. 2, 1971 | Ocala, FL | More | |
| Obal, Bud | TBB | P | 1954 | |||||||||
| O'Bannon, Turhon | WPG | WR | I | 1996-97 | 82 | New Mexico | 6.01 | 200 | Mar. 23, 1970 | Torrance, CA | More | |
| Oberg, Tom | WPG | DB | I | 1971-73 | 21 | Portland State | 5.11 | 185 | Aug. 7, 1945 | Portland, OR | ||
| Oberhoffner, Boyd | RNAV | E | 1942 | |||||||||
| Obernesser, Jack | TOR | N | 1945 | |||||||||
| O'Billovich, Bob | OTT | DB, QB | I | 1963-67 | 10 | Montana State | 5.10 | 182 | June 30, 1940 | Butte, MT | More | |
| O'Billovich, Jack | HAM | MLB | I | 1967 | 25 | Oregon State | 5.11 | 225 | June 5, 1942 | Butte, MT | Feb. 13, 1995 | More |
| O'Billovich, Tony | TOR | LB | I | 1994-95 | 39 | Oregon State | 6.01 | 210 | Aug. 30, 1970 | Eugene, OR | More | |
| O'Bradovich, Ed | BC | DE | I | 1961 | 77 | Illinois | 6.03 | 255 | May 21, 1940 | Melrose Park, IL | ||
| O'Bradovich, Ed | CAL | DE | I | 1961 | 71 | Illinois | 6.03 | 255 | May 21, 1940 | Melrose Park, IL | ||
| O'Breeza, William (Bill) | HALT | C, T | N | 1940 | ||||||||
| O'Breeza, William (Bill) | HTG | C, T | N | 1945-49 | 1, 5, 30, 77 | |||||||
| O'Breeza, William (Bill) | HWC | C, T | N | 1941-45 | 1 | |||||||
| O'Breza | HCUB | FW | 1935-36 | |||||||||
| O'Brian, Mike | HAM | K | N | 2002 | 81 | Western Ontario | 6.00 | 200 | July 27, 1976 | Hamilton, ON | More | |
| O'Brian, Mike | SASK | K | N | 2001 | 79 | Western Ontario | 6.00 | 200 | July 27, 1976 | Hamilton, ON | More | |
| O'Brien | LON | C | 1959 | |||||||||
| O'Brien | MWW | HB | N | 1920-21 | ||||||||
| O'Brien | PET | N | 1907 | |||||||||
| O'Brien | TBB | G | 1934 | |||||||||
| O'Brien, A.H. | TOR | N | 1884-85 | 83 | ||||||||
| O'Brien, Eddie | EDM | 1939 | ||||||||||
| O'Brien, Ginger | MNAV | E | N | 1944 | ||||||||
| O'Brien, Jim | TNB | N | 1944 | North Toronto Collegiate | ||||||||
| O'Brien, Jim | TOR | 1945-46 | North Toronto Collegiate | |||||||||
| O'Brien, John | HAM | LB | N | 1990 | 44 | York | 6.02 | 215 | Oct. 27, 1966 | Hamilton, ON | More | |
| O'Brien, Kevin | SAC | LB | I | 1994 | 48 | Bowling Green | 6.04 | 235 | July 1, 1970 | |||
| O'Brien, Tom | CAL | T | I | 1957 | 62 | Notre Dame | 6.04 | 246 | ||||
| O'Brien, Wayne | MON | LB | N | 1968 | 48 | McMaster | 6.01 | 228 | ||||
| Obrovac, Mike | TOR | G | I | 1979-80 | 51 | Bowling Green | 6.06 | 275 | Oct. 11, 1955 | Canton, OH | ||
| O'Callaghan, Maurice | TBB | E | N | 1953-54, 56 | ||||||||
| Ochiena, Ed | HAM | E, F | N | 1962 | 70 | North York Rangers | 6.02 | 184 | Jan. 26, 1938 | |||
| Ochiena, Ed | TOR | E, F | N | 1959-61 | 70 | North York Rangers | 6.02 | 184 | Jan. 26, 1938 | |||
| Ockimey, Ron | BC | LB | I | 2002-03 | 45 | San Jose State | 6.00 | 215 | Sept. 3, 1978 | Philadelphia, PA | ||
| Ockimey, Ron | WPG | LB, S | I | 2005-06 | 15 | San Jose State | 6.00 | 215 | Sept. 3, 1978 | Philadelphia, PA | ||
| O'Connell, Huck | KWD | C, G | 1953, 55-59 | 49, 76 | Ontario Agricultural College | 5.10 | 205 | |||||
| O'Connell, Jack | OTR | G | 1945-46 | 17 | ||||||||
| O'Connor | BRAN | 1952 | ||||||||||
| O'Connor | HTG | 1945 | 20 | |||||||||
| O'Connor, Bill (Zeke) | TOR | WR | 1952-53 | 75 | Notre Dame | 6.04 | 220 | May 2, 1926 | New York, NY | |||
| O'Connor, Chappie | MI | HB | I | 1937 | 20 | |||||||
| O'Connor, Chappie | SASK | QB | I | 1936 | ||||||||
| O'Connor, Chappie | SASK | HB | N | 1935-36 | ||||||||
| O'Connor, Jack Dr. | TOR | HB, P | 1911-14, 20-22 | |||||||||
| O'Connor, Pete | OTT | E, HB | 1937-42 | 24, 35, 70 | 155 | |||||||
| October, Winston | EDM | CB, WR, KR | I | 20001-04 | 9 | Richmond | 5.09 | 165 | July 12, 1976 | Guyana | More | |
| October, Winston | MON | CB, WR, KR | I | 1999-2000 | 11 | Richmond | 5.09 | 165 | July 12, 1976 | Guyana | More | |
| O'Day, Jeremy | SASK | C, G | N | 1999-2010 | 54 | Edinboro | 6.03 | 223 | Aug. 31, 1974 | Buffalo, NY | More | |
| O'Day, Jeremy | TOR | C, G | N | 1997-98 | 54 | Edinboro | 6.03 | 223 | Aug. 31, 1974 | Buffalo, NY | More | |
| Oddonetto, John | BC | OL | I | 2002 | 65 | Kansas | 6.04 | 305 | Nov. 17, 1977 | Globe, AZ | ||
| Odegard, Don | HAM | DB | I | 1994 | 28 | UNLV | 6.00 | 180 | Nov. 22, 1966 | Seattle, WA | More | |
| Odegard, Don | MPH | DB | I | 1995 | 21 | UNLV | 6.00 | 180 | Nov. 22, 1966 | Seattle, WA | More | |
| Odegard, Don | TOR | DB | I | 1996 | 23 | UNLV | 6.00 | 180 | Nov. 22, 1966 | Seattle, WA | More | |
| Odette, Lou | TBB | 1943 | ||||||||||
| O'Doherty | DET | T | 1959 | |||||||||
| O'Doherty, Bob | OTT | WR | N | 1979 | 2 | Queen's | 6.00 | 185 | Apr. 27, 1956 | |||
| O'Doherty, Bob | WPG | WR | N | 1979-81 | 79 | Queen's | 6.00 | 185 | Apr. 27, 1956 | |||
| Odom, DeWayne | EDM | LB | I | 1992 | 44 | California | 6.03 | 235 | Aug. 10, 1968 | Oceanside, CA | ||
| Odom, Mark | CAL | LB | 1991 | 98 | Hawaii | 5.11 | 215 | Apr. 7, 1969 | Carson, CA | |||
| O'Donahoe, G.A. | MH | E | 1945 | 66 | ||||||||
| O'Donnell | MCGU | N | 1924 | |||||||||
| O'Donohue, Gerald | WPG | E | 1942 | |||||||||
| Odson, Urban | MON | T | I | 1950 | 56 | Minnesota | 6.03 | 257 | Nov. 17, 1918 | Clark, SD | June 22, 1986 | More |
| Odums, Ray | CAL | CB | I | 1977-84 | 32 | Alabama | 6.02 | 175 | Oct. 30, 1951 | More | ||
| Odums, Ray | SASK | CB | I | 1975-76 | 12 | Alabama | 6.02 | 175 | Oct. 30, 1951 | More | ||
| Odums, Ray | WPG | CB | I | 1975 | Alabama | 6.02 | 175 | Oct. 30, 1951 | More | |||
| Oduwole, Deji | WPG | DL | N | 2010-11 | 94 | Calgary | 6.03 | 250 | Aug. 23, 1987 | |||
| Oesterling, Tim | SASK | DT | 1972 | 69 | UCLA | 6.04 | 250 | May 5, 1948 | Betheusda, MD | |||
| Oetting, Bob | BC | T | I | 1965 | 61 | Concordia/T.C. Neb. | 6.05 | 260 | Nov. 16, 1942 | Emma, MO | ||
| Oetting, Bob | TOR | T | I | 1966 | 64 | Concordia/T.C. Neb. | 6.05 | 260 | Nov. 16, 1942 | Emma, MO | ||
| O'Flaherety | TU | HB | N | 1919 | ||||||||
| O'Flaherty | TOR | N | 1915 | |||||||||
| O'Flanagan, Gerry | BC | T, E | N | 1957 | 63 | UBC | 6.02 | 215 | 1932? | Vancouver, BC | ||
| O'Flanagan, Gerry | TOR | T | N | 1956 | 73, 75 | UBC | 6.02 | 215 | 1932? | Vancouver, BC | ||
| Ogalski, Ed | WPG | C | 1945-46 | 38 | ||||||||
| O'Garro, Pete | TOR | E | 1957-59, 62 | 73 | UCLA | 6.04 | 210 | May 13, 1931 | ||||
| Ogden, Fred | TBB | G | N | 1924-27. 29 | ||||||||
| Ogden, Fred | TOR | G | N | 1922-23 | ||||||||
| Ogilvie, E. | OTT | 1930-31 | 13, 21 | |||||||||
| Ogradnick | TNB | T | 1943 | 53 | ||||||||
| Ogradnick, Steve (Butch) | WPG | 1941-42 | 42 | |||||||||
| O'Hagan, Wilt | SASK | HB | N | 1954 | 95 | Winnipeg Jr | 5.10 | 165 | ||||
| O'Hara | TNB | G | 1943 | |||||||||
| O'Hara, Brian | SASK | SB | N | 1976-79 | 16 | Whitworth | 6.00 | 185 | May 2, 1954 | |||
| O'Hara, Frank | BRAN | G, T | 1952-53 | 5.11 | 200 | 1924? | ||||||
| O'Hara, Frank | HAM | T, G | 1950 | 5.11 | 200 | 1924? | ||||||
| O'Hara, Frank | HWC | T, G | 1946-49 | 21 | 5.11 | 200 | ||||||
| O'Hara, Syl | KWD | FW, HB, E | 1953-56, 58 | 42 | Western Ontario | 5.10 | 180 | |||||
| O'Heir, Myles | HTG | 1913 | ||||||||||
| Ohler, Pete | BC | QB | N | 1963-64,66-69 | 11, 18 | Washington | 6.02 | 200 | 1941? | |||
| Oja, Bert | WPG | G | I | 1935-37 | 16 | Minnesota | 200 | |||||
| O'Keefe, Johnny | SASK | C | 1938 | |||||||||
| Okeke, Uzooma | MON | T | I | 1997-2006 | 53 | Southern Methodist | 6.02 | 310 | Sept. 3, 1970 | Beaumont, TX | More | |
| Okeke, Uzooma | OTT | T | I | 1996 | 53 | Southern Methodist | 6.02 | 310 | Sept. 3, 1970 | Beaumont, TX | More | |
| Okeke, Uzooma | SHR | T | I | 1994-95 | 60 | Southern Methodist | 6.02 | 310 | Sept. 3, 1970 | Beaumont, TX | More | |
| Okoniewski, Steve | WPG | DE | I | 1978 | 53 | Montana | 6.03 | 257 | Aug. 22, 1949 | Bremerton, WA | ||
| Okpro, Sammy | EDM | DB | N | 2008 | 19 | Concordia | 5.10 | 192 | May 2, 1984 | Montreal, QB | ||
| Olander, A. | EDM | 1939 | ||||||||||
| Olander, Cliff | EDM | QB | I | 1982 | 11 | New Mexico State | 6.05 | 191 | May 15, 1955 | Hartford, CT | ||
| Olander, Steve | EDM | 1939 | ||||||||||
| Olander, Steve | SJC | N | 1932 | |||||||||
| Olander, Steve | WPG | HB, K | N | 1933-37 | 2, 8 | Winnipeg Native Sons (Jr.) | 182 | |||||
| Olatioya, Jovan | BC | OL | I | 2010-11 | 63 | North Carolina Central | 6.06 | 325 | Dec. 16, 1987 | Detroit, MI | ||
| Oldenburg, Jim | HWC | HB, PK | I | 1948 | 34 | Canisius | 225 | |||||
| Oldham, Hugh | OTT | WR | I | 1970-74 | 27 | Oregon | 5.10 | 175 | Mar. 18, 1943 | Caldwell, TX | ||
| Oldwell | TOR | N | 1884 | |||||||||
| O'Leary, John | MON | RB | I | 1977-79 | 30 | Nebraska | 6.01 | 210 | July 10, 1954 | Mineola, NY | ||
| Oleksiak, Roman (Pat) | WPG | HB, FB | 1955 | 77, 88 | Tennessee | 6.00 | 205 | |||||
| Olenchalk, John | MON | LB | I | 1978 | 41 | Stanford | 6.01 | 228 | Nov. 27, 1955 | Stockton, CA | ||
| Olford, Jason | BC | CB | 2003 | 29 | Louisiana Tech | 5.10 | 183 | July 22, 1978 | Little Rock, AK | More | ||
| Oliphant, George | TOR | N | 1940-41 | Western Ontario | ||||||||
| Oliphant, George | TRH | N | 1942-43 | Western Ontario | ||||||||
| Oliphant, Mike | SAC | RB | I | 1993-94 | 33 | Rutgers | 5.10 | 183 | May 19, 1963 | Jacksonville, FL | ||
| Oliphant, Mike | WPG | RB | I | 1995 | 19 | Rutgers | 5.10 | 183 | May 19, 1963 | Jacksonville, FL | ||
| Olive, Bobby | HAM | WR | I | 1998 | 88 | Ohio State | 6.00 | 167 | Apr. 22, 1969 | Paris, TN | ||
| Oliver | KWD | C | 1954-55 | 20 | ||||||||
| Oliver | SQ | N | 1924 | |||||||||
| Oliver, Bobby Jack | EDM | T | 1964 | 67 | Baylor | 6.02 | 245 | Nov. 1936 | Waco, TX | More | ||
| Oliver, Bobby Jack | HAM | T | I | 1964 | 66 | Baylor | 6.02 | 245 | Nov. 1936 | Waco, TX | More | |
| Oliver, Bobby Jack | MON | T | I | 1961-63 | 63 | Baylor | 6.02 | 245 | Nov. 1936 | Waco, TX | More | |
| Oliver, Bobby Jack | TOR | T | I | 1958-60 | 62 | Baylor | 6.02 | 245 | Nov. 1936 | Waco, TX | More | |
| Oliver, Frank | BC | DB | I | 1978-79 | 17 | Kentucky State | 6.01 | 196 | Mar. 3, 1952 | Wetumpka, AL | ||
| Oliver, Frank | OTT | DB | I | 1980 | 25 | Kentucky State | 6.01 | 194 | Mar. 3, 1952 | Wetumpka, AL | ||
| Oliver, Jimmy | BC | WR | I | 1999-01 | 85 | Texas Christian | 5.10 | 198 | July 30, 1973 | Dallas, TX | More | |
| Oliver, Jimmy | OTT | WR | I | 2002 | 85 | Texas Christian | 5.10 | 198 | July 30, 1973 | Dallas, TX | More | |
| Oliver, Jimmy | TOR | WR | I | 2003 | 85 | Texas Christian | 5.10 | 198 | July 30, 1973 | Dallas, TX | More | |
| Oliver, Travis | EDM | CB | I | 1992 | 23 | Berkeley | 6.00 | 180 | Mar. 10, 1968 | Victoria, TX | ||
| Ollinger, Jerry | HTG | QB, HB | 1945-46 | 3 | ||||||||
| Ollman | HTG | 1948 | 37 | |||||||||
| Olsacher, Lou | TOR | T | N | 1992-93 | 51 | St. Mary's | 6.02 | 270 | Oct. 12, 1965 | Hamilton, ON | ||
| Olsen, Charlie | EDM | G, T | 1956 | 67 | Denver | 6.03 | 200 | |||||
| Olsen, Ralph | MON | E | N | 1950 | 59 | N.D.G. Maple Leafs (Jr.) | 6.01 | 185 | ||||
| Olsen, Ray | CALB | QB, P | 1937 | Gonzaga | ||||||||
| Olsen, Richard (Rusty) | SASK | DT | I | 1983-85 | 79 | Washington | 6.02 | 255 | June 18, 1959 | West Covina, CA | ||
| Olsen, Richard (Rusty) | TOR | DT | I | 1982 | 79 | Washington | 6.02 | 255 | June 18, 1959 | West Covina, CA | ||
| Olson, Albert | WPG | G, E | 1943-45 | 9 | ||||||||
| Olson, Ted (Oke) | MI | QB | 1936-37 | 21 | North Dakota | |||||||
| Olson, Ted (Oke) | SASK | QB | 1934-35 | North Dakota | ||||||||
| Olssen, Lance | EDM | T | I | 1971-72 | 62 | Purdue | 6.05 | 257 | April 17, 1947 | Boston, MA | ||
| Olszewski, Ed | BRAN | G | 1952 | Niagra | ||||||||
| Olszewski, Ed | HWC | G | 1948-49 | Niagra | 5.11 | 195 | ||||||
| Olszewski, Harry | MON | G | I | 1969-70 | 51 | Clemson | 5.10 | 250 | Nov. 10, 1946 | Baltimore, MD | More | |
| Oltean | SASK | 1940 | ||||||||||
| Olynick, Cory | WPG | FB | N | 2004 | 33 | Regina Jr | 5.11 | 210 | Mar. 27, 1977 | Regina, SK | ||
| O'Mahoney, Jim | MON | LB | I | 1967 | 47 | Miami | 6.01 | 228 | July 23, 1931 | Youngstown, OH | More | |
| O'Mahony, Duncan | BC | K | N | 2004-05 | 7 | UBC | 5.10 | 201 | June 29, 1976 | Kilkenny, Ireland | ||
| O'Mahony, Duncan | CAL | K | N | 2001-03, 07 | 91, 97 | UBC | 5.10 | 201 | June 29, 1976 | Kilkenny, Ireland | ||
| O'Mahony, Duncan | WPG | K | N | 2008 | 19 | UBC | 5.10 | 183 | June 29, 1976 | Kilkenny, Ireland | ||
| O'Malley, Tom | OTT | QB | I | 1951-53 | 80 | Cincinnati | 6.00 | 190 | July 23, 1925 | |||
| O'Meara, Matt | SASK | OL | N | 2005-06, 09 | 67 | McMaster | 6.04 | 294 | Aug. 7, 1982 | Milton, ON | ||
| O'Meara, Matt | WPG | OL | N | 2007-08 | 67 | McMaster | 6.04 | 294 | Aug. 7, 1982 | Milton, ON | ||
| Onatolu, Kenny | EDM | LO | I | 2007-08 | 44 | Nebraska-Omaha | 6.02 | 225 | Oct. 8, 1982 | Chicago, IL | ||
| O'Neal, Calvin | HAM | LB | 1979 | 44 | Michigan | 6.01 | 235 | Oct. 6, 1954 | Osceola, AR | |||
| O'Neal, Jesse | BC | DE | I | 1977 | 79 | Grambling | 6.04 | 255 | July 11, 1952 | Crowley, LA | ||
| O'Neal, Jesse | HAM | DL | I | 1979 | 79 | 6.04 | 255 | July 11, 1952 | Crowley, LA | |||
| O'Neal, Jesse | SASK | DE | I | 1975-76 | 61 | Grambling | 6.04 | 255 | July 11, 1952 | Crowley, LA | ||
| O'Neil | OTT | E | N | 1921 | ||||||||
| O'Neil, Bob | CAL | G | I | 1958-60 | 51 | Duquesne/Notre Dame | 6.01 | 230 | Feb. 2, 1931 | |||
| O'Neil, Bob | MON | G | I | 1960 | 45 | Duquesne/Notre Dame | 6.01 | 230 | Feb. 2, 1931 | |||
| O'Neil, Stan (Windy) | OTT | HB | I | 1935-41 | 9, 13, 40, 73 | Pittsburgh | 187 | |||||
| Oneschuk, Steve | HAM | OLB | N | 1955-60 | 14, 81 | Toronto | 5.11 | 180 | 1931? | |||
| Onhauser, Joe | SASK | T | N | 1924 | ||||||||
| Onions, Len | HP | 1937 | ||||||||||
| Onions, Len | HTG | 1938-40 | 34 | |||||||||
| Onyenegecha, Chujiuke | WPG | DB | I | 2007 | 24 | Oklahoma | 6.01 | 209 | Mar. 15, 1983 | San Francisco, CA | ||
| Oosterhuis, Jon | WPG | DL, FB | 2002-10 | 77 | New Hampshire | 6.04 | 273 | June 13, 1977 | Fergus, ON | |||
| Opalinski, Alex | EDM | E | N | 1961-63 | 75 | Edmonton Huskies Jr. | 6.04 | 200 | ||||
| O'Pella, Gene | SASK | E | 1959 | 72 | Villanova | 6.05 | 235 | |||||
| Oquendo | OTT | 1941 | 61 | |||||||||
| O'Quinn, John (Red) | MON | E | I | 1952-59 | 73 | Wake Forest | 6.02 | 195 | Sept. 7, 1925 | Bluett Falls, NC | More | |
| Oramasionwu, Don | WPG | DT | N | 2009-11 | 93 | Manitoba | 6.03 | 255 | June 4, 1986 | Winnipeg, MB | ||
| Orange, Doyle | HAM | RB | I | 1977-78 | 32 | Southern Mississippi | 5.11 | 200 | Aug. 6, 1951 | Waycross, GA | More | |
| Orange, Doyle | TOR | RB | I | 1974-76 | 25 | Southern Mississippi | 5.11 | 200 | Aug. 6, 1951 | Waycross, GA | More | |
| Orban, Bill | RNAV | HB | 1942 | |||||||||
| Orban, Bill | SASK | HB | N | 1941 | ||||||||
| Orban, Bill | WPG | 1945 | ||||||||||
| Ordway, Bill | WPG | HB | I | 1946 | 12 | North Dakota | 6.00 | 190 | 1917? | |||
| Ordway,Jonathan | OTT | DB | I | 2003-04 | 20 | Boston College | 5.11 | 181 | Oct. 19, 1978 | Tampa Bay, FL | ||
| O'Ree, Bob | TBB | T | 1952 | |||||||||
| O'Reilly | TOR | N | 1919 | |||||||||
| O'Reilly, Joseph (Sefa) | WPG | DE | I | 2001 | 9 | Oregon State | 6.02 | 240 | Dec. 29, 1975 | Los Angelas, CA | More | |
| Organ, Gerry | OTT | K | 1971-77, 79-83 | 71 | Guelph | 6.02 | 200 | Dec. 4, 1944 | England | More | ||
| Oriard, Mike | HAM | OT | I | 1974 | 64 | Notre Dame | 6.04 | 223 | May 26. 1948 | Spokane, WA | ||
| Orlando, Mark | BALT | WR | I | 1995 | 83 | Towson State | 6.01 | 190 | Oct. 23, 1972 | Baltamore, MD | ||
| Orley, Ted | WPG | 1930 | ||||||||||
| Ornstein Gus | BC | QB | I | 2002 | 19 | Rowan College | Nov. 23, 1974 | New York, NY | ||||
| Orr | MWW | 1934 | ||||||||||
| Orr | TOR | N | 1880 | |||||||||
| Orr, Thomas | BIRM | DB | I | 1995 | 24 | West Virginia | 5.11 | 190 | Aug. 14, 1972 | Elizabeth, NJ | ||
| Orris, Glenn | WPG | WR | N | 1969-70 | 70, 71, 77 | Simon Fraser | 6.01 | 203 | ||||
| Ortega, Travis | WPG | LB | I | 2003-04 | 42 | Rice | May 11, 1977 | San Antonio, TX | ||||
| Ortiz, Chase | WPG | DE | I | 2009 | 56 | Texas Christian | 6.03 | 247 | May 22, 1985 | Texas City, TX | ||
| Ortiz, Robert | BC | WR | I | 2007 | 80 | San Diego State | 6.01 | 190 | May 3, 1987 | San Diego, CA | ||
| Ortiz, Sean | BC | DL | N | 2010 | 91 | UBC | 6.02 | 239 | Apr. 5, 1985 | White Rock, BC | ||
| Ortiz, Sean | HAM | DL | N | 2011 | 91 | UBC | 6.02 | 240 | Apr. 5, 1985 | |||
| Ortiz, Sean | MON | DT | N | 2009 | 79 | UBC | 6.01 | 266 | May 4, 1985 | White Rock, BC | ||
| Ortman, Len | SASK | C | N | 1946-52 | 46, 60 | Regina Jr | 5.11 | 212 | 1926? | |||
| Osadka, Walt | WDS | 1948 | ||||||||||
| Osaisai, Wopamo | EDM | DB | I | 2011 | 33 | Stanford | 5.10 | 199 | Sept. 13, 1986 | Pinole, CA | ||
| Osbaldiston, Paul | BC | K | N | 1986 | 19 | Richmond Raiders Jr. | 6.03 | 236 | Apr. 27, 1964 | Oldham, England | More | |
| Osbaldiston, Paul | HAM | K | N | 1986-03 | 3 | Richmond Raiders Jr. | 6.03 | 236 | Apr. 27, 1964 | Oldham, England | More | |
| Osbaldiston, Paul | WPG | K | N | 1986 | 8 | Richmond Raiders Jr. | 6.03 | 236 | Apr. 27, 1964 | Oldham, England | More | |
| Osborne | HRC | SCRM | N | 1919 | ||||||||
| Osborne | MI | 1937 | 30 | |||||||||
| Osborne | TNB | HB | 1942 | |||||||||
| Osborne, Dee | WPG | LB | I | 1997 | 48 | Miami (Ohio) | 6.02 | 230 | July 24, 1975 | Chicago, IL | More | |
| Osborne, Eldonta | SHR | LB | I | 1994-95 | 46 | Louisiana Tech | 6.00 | 226 | Aug. 12, 1967 | |||
| Osborne, Ray | BC | G, DT | I | 1963 | 60 | Mississippi State | 6.04 | 235 | ||||
| Osborne, Ray | WPG | G, DT | I | 1964 | 60 | Mississippi State | 6.04 | 235 | ||||
| Oscopovich | CBB | T | 1940 | |||||||||
| O'Shea, Mike | HAM | LB | N | 1993-95, 2000 | 59 | Guelph | 6.03 | 223 | Sept. 21, 1970 | North Bay, ON | ||
| O'Shea, Mike | TOR | LB | N | 1996-99, 01-08 | 50 | Guelph | 6.03 | 223 | Sept. 21, 1970 | North Bay, ON | ||
| Osier | TOR | N | 1874 | |||||||||
| Ostendarp, Jim | MON | HB | I | 1952 | 85 | Bucknell | 5.08 | 178 | Feb. 15, 1923 | Baltimore, MD | Dec. 15, 2005 | More |
| Ostopovich, Johnny | WDS | FW | 1945, 47 | |||||||||
| Ostypak | OTT | G | 1937-39 | 27, 49, 62 | 240 | |||||||
| Oswald | KITP | 1942 | ||||||||||
| O'Toole, Jack | LON | C, DG, PK | I | 1956, 58 | 77 | U.S. Army | 5.11 | 215 | ||||
| Otto, Ed | HWC | T | 1948 | |||||||||
| Otto, Vic | HWC | T | 1946-48 | 26 | ||||||||
| Otton, Charlie | SASK | HB, FW | N | 1913-14, 19 | ||||||||
| Otton, Howard | RBC | E | N | 1920-22 | ||||||||
| Otton, Howie | SASK | E, HB. G, T | N | 1916, 19, 23 | ||||||||
| Oumet (?) | PET | 1939 | ||||||||||
| Outley, David | OTT | DB | I | 1985 | 5 | Louisiana - Monroe | 5.11 | 182 | Mar. 15, 1962 | |||
| Overend | QU | SCRM | N | 1909 | ||||||||
| Overstreet, David | MON | RB | I | 1981-82 | 20 | Oklahoma | 5.11 | 202 | Sept. 20, 1958 | Big Sandy, TX | June 25, 1984 | More |
| Overton, Bill | HAM | DB | 1969 | 71 | Wake Forest | |||||||
| Ovington, Peter | TOR | N | 1899 | |||||||||
| Owen, Harper | TI | HB | I | 1943 | ||||||||
| Owen, Ken | MON | HB | 1957 | 87 | Georgia Tech | 6.00 | 195 | 1935? | ||||
| Owens, Alton (Buddy) | BC | G | 1967 | 54 | Michigan State | 6.01 | 230 | Aug. 22, 1944 | Amherst, TX | |||
| Owens, Chad | MON | WR | I | 2009 | 87 | Hawaii | 5.08 | 180 | Apr. 3, 1982 | Honolulu, HI | ||
| Owens, Chad | TOR | WR | I | 2010-11 | 2 | Hawaii | 5.08 | 180 | Apr. 3, 1982 | Honolulu, HI | ||
| Owens, Dondre | CAL | DB | 1994-95 | 14 | Howard | 5.09 | 170 | July 10, 1972 | Baltamore, MD | |||
| Owens, Johnny | CAL | DE | I | 1976 | 76 | Tennessee State | 6.05 | 255 | Jan. 8, 1953 | Brownsville, TX | More | |
| Owens, Ollie | WDS | HB | 1949-50 | 5.09 | 195 | |||||||
| Oxley, Anthony | OTT | RB | N | 1994 | 37 | St. Mary's | 5.11 | 195 | July 24, 1968 | Halifax, NS | More | |
| Ozarko, Mike | HTG | T | N | 1938-40 | 21, 35 | Tor. RCAF Hurricanes | ||||||
| Ozarko, Mike | OTR | T | 1947 | 44 | ||||||||
| Ozarko, Mike | OTT | T | N | 1945-46 | 64 | Tor. RCAF Hurricanes | ||||||
| Ozarko, Mike | TRH | G, T | N | 1942-43 |