Oaks, Harold Anthony ‘Doc’ (1896-1968)
Oakes, Albert H. (1869-?)
Oberman, Sheldon (1949-2004)
O’Brien, Aidan J. (1942-2015)
O’Brien, Murrough Charles (1868-1955)
O’Bryan, Gregory (1858-1907)
O’Connell, Patrick Dennis “Paddy” (1944-2005)
O’Connor, Jeremiah Edward (c1871-1912)
O’Connor, James (1830-1905)
O’Connor, William “Billy” John (1837-1910)
O’Connor, William John (1932-2008)
Oddson, Asta Austmann (1893-1974)
Oddson, Thorsteinn (1864-1934)
Oddstad, John Herman (1902-1983)
Oddy, Crispin (1881-1972)
O’Dell, Evelyn Margaret Flett (1913-2002)
Odell, Harvey Cecil (1892-1975)
Odjig, Daphne (1919-2016)
Odlum, Victor Wentworth (1880-1971)
O'Donnell, John Harrison (1838-1912)
O'Donoghue, Charles Henry (1885-1961)
O'Donoghue, William Bernard (1843-1878)
O'Donohoe, Martin J. (1868-1909)
O'Dowda, Ernest Peter “Ernie” (1915-1985)
Oelkers, Henry (1902-1963)
Offen, Thomas William (1881-1959)
Ogg, Alfred (1924-1950)
Ogilvie, Andrew Alexander (c1862-1892)
Ogilvie, William (1849-1912)
Oglesby, William Vincent (1884-1965)
Ogletree, Francis (1826-1916)
Ogletree, Henry (1860-1952)
O’Grady, Christopher Shaughnessy (1939-2017)
O’Grady, John Waller de Courcy (1854-1914)
O’Hara, Michael (1889-?)
O’Hare, John Peter (1876-1964)
O’Kelly, Christopher Patrick John (1895-1922)
Olafsson, Gisli (1855-1909)
Olafson, Oddur (1888-1972)
Olafsson, Jon (1850-1916)
Olchowecki, Peter Jacob (1911-2011)
Oldershaw, Charles Russell (1864-1946)
Oldfield, John Henry (1857-1924)
O’Leary, M. Grattan (1888-1976)
Olecko, Raymond “Ray” (1930-2001)
Olensky, Harry (1923-2005)
Olesczuk, Leon Rudolph (1903-1971)
Olesków, Josef (1860-1903)
Oleson, Charlotte Louise Kingdon (1932-2017)
Oleson, Gudni Julius (c1877-1957)
Oleson, Stanley Adaljon (1931-2018)
Oleson, Thomas Tryggvi “Tom” (1946-2012)
Oleson, Tryggvi Julius (1912-1963)
Olive, George Edward (1887-1973)
Oliver, Arthur Raymond “Art” (1916-1977)
Oliver, Ernest A. H. A. N. (1861-?)
Oliver, George Johnston (1892-1968)
Oliver, John Saxby “Jack” (1910-1992)
Oliver, Reginald Marchant (1888-1964)
Oliver, Robert J. (1866-1939)
Oliver, Roland Earl (1892-?)
Oliver, William Gladstone (1890-1968)
Ollivier, Rene Allen (?-1982)
Olmstead, Oliver Glen (?-1997)
O’Lone, Hugh Francis “Bob” (c1836-1871)
O'Loughlin, John Miles (1849-1906)
O'Loughlin, M. R. (1853-1917)
Olsen, Albert H. (1922-2008)
Olsen, Floris June (1902-1984)
Olson, Benjamin Franklin (1898-1981)
Olson, Carl Jonas (1884-1951)
Olson, Shirley (c1944-1990)
O'Malley, Robert George (1857-1938)
Omand, John (1823-1905)
O'Meara, James Dallas (1849-1901)
Omichinski, Joseph Gerald (1916-2002)
Onysko, Mytro “Tony” (1928-1992)
Onysko, Peter Michael (1906-1993)
Ooligbuck (?-1852)
Orchard, Clarence Harold Franklin (1878-1956)
Orchard, John Donovan “Jack” (1910-1972)
O’Reilly Edward (1848-1904)
O'Reilly, John (1844-1914)
Orlandini, Richard Joseph (1945-2015)
Orlikow, David (1918-1998)
Orlikow, Lionel Gordon (1932-2008)
Orlikow, Velma “Val” Jessie (1917-1990)
Orlins, Benny Zenon (?-1996)
Ormond, Daniel Mowat (1885-1974)
Orok, Robert Dick (1878-1957)
Orr, Gordon (c1907-1991)
Orr, John Franklin (1870-1942)
Orr, Margaret McBride (1900-2001)
Orr, Philip Henry (1882-1964)
Orriss, Beatrice Fern (1903-1979)
Orton, George Turner (1837-1901)
Orvis, Brian Norman (1931-2010)
Orzechowski, Jim (1944-2003)
Osborn, John Robert (1899-1941)
Osborne, Ethel Frances Lindsay (1877-?)
Osborne, Helen Betty (1952-1971)
Osborne, Joseph Alexander (1861-1948)
Osborne, Rockwell Colman (1874-?)
Osborne, William Frederick (1873-1950)
Osland, Leslie Milton (1921-1993)
Osler, Edmund Boyd (1919-1987)
Osler, Gordon Peter (1922-2012)
Osler, Hugh Farquharson (1881-1943)
Osman, Thelma Rose Irene (1922-2018)
Osovsky, Aaron (1879-1948)
Ostaff, Jessie (1915-2005)
Ostapovitch, William Henry (1919-2003)
Ostenso, Martha (1900-1963)
Oster, David B. (c1948-2002)
Ostrander, Alice Edith (1893-1970)
Ostry, Sylvia Knelman (1927-2020)
O’Sullivan, Eugene Jean (1868-?)
O’Sullivan, Irene Gabrielle Potvin (1909-?)
O’Sullivan, Jewel Mary Theresa Victoria “Dulie” (1914-2005)
O’Sullivan, Joseph Francis (1927-1992)
Oswald, Gregory Mark (1955-2008)
Osyczenko, Fedir (1927-2014)
Otchenash, Andrew (1927-2007)
Outhwaite, John Erle (1920-2018)
Over, Walter Percy (1874-?)
Overgaard, Haakon Magnus Leonard (c1885-1974)
Owen, David Dale (1807-1860)
Owen, William R. (1864-?)
Owens, Dalton Oswald (1893-1964)
Owens, George Owen (1905-1993)
Owens, Margaret (1866-1931)
Oxton, Stephen Clifford (1869-1927)