Oaks, Harold Anthony ‘Doc’ (1896-1968)
Oakes, Albert H. (1869-?)
O'Brien, Murrough Charles (1868-1955)
O’Bryan, Gregory (1858-1907)
O’Connor, James (1830-1905)
O’Connor, William “Billy” John (1837-1910)
O’Connor, William John (1932-2008)
Oddson, Thorsteinn (1864-1934)
Oddy, Crispin (1881-1972)
Odell, Harvey Cecil (1892-1975)
Odlum, Victor Wentworth (1880-1971)
O'Donnell, John Harrison (1838-1912)
O'Donoghue, William Bernard (1843-1878)
O'Donohoe, Martin J. (1868-1909)
Oelkers, Henry (1902-1963)
Offen, Thomas W. (1881-?)
Ogilvie, William (1849-1912)
Oglesby, William Vincent (1884-1965)
Ogletree, Francis (1826-1916)
Ogletree, Henry (1860-1952)
O'Grady, John Waller de Courcy (1854-1914)
O’Hara, Michael (1889-?)
O’Hare, John (1876-1964)
O’Kelly, Christopher Patrick John (1895-1922)
Olafsson, Gisli (1855-1909)
Olafson, Oddur (1888-1972)
Olafsson, Jon (1850-1916)
Oldfield, John Henry (1857-1924)
O’Leary, M. Grattan (1888-1976)
Olesków, Josef (1860-1903)
Oleson, Thomas Tryggvi “Tom” (1946-2012)
Oleson, Tryggvi Julius (1912-1963)
Olive, George Edward (1887-1973)
Oliver, Ernest A. H. A. N. (1861-?)
Oliver, Reginald (1890-?)
Oliver, Robert J. (1866-1939)
Oliver, Roland Earl (1892-?)
Oliver, William Gladstone (1890-1968)
Ollivier, Rene A. (?-1982)
O'Lone, Robert “Bob” (?-1872)
O'Loughlin, John Miles (1849-1906)
O'Loughlin, M. R. (1853-1917)
Olsen, Albert H. (1922-2008)
Olsen, Floris June (1902-1984)
Olson, Carl Jonas (1884-1951)
Olson, Shirley (c1955-1990)
O'Malley, Robert George (1857-1938)
Omand, John (1823-1905)
O'Meara, James Dallas (1849-1901)
Omichinski, Joseph Gerald (1916-2002)
Ooligbuck (?-1852)
Orchard, Harold (1878-1956)
Orok, Robert Dick (1878-1958)
O'Reilly, John (1844-1914)
Orlikow, David (1919-1998)
Orlikow, Lionel (1932-2008)
Orlikow, Velma “Val” Jessie (1917-1990)
Ormond, Daniel Mowat (1885-1974)
Orr, Gordon (c1907-1991)
Orr, Margaret McBride (1900-2001)
Orr, Philip Henry (1882-?)
Orton, George Turner (1837-1901)
Orvis, Brian Norman (1931-2010)
Osborn, John Robert (1899-1941)
Osborne, Ethel Frances Lindsay (1877-?)
Osborne, J. A. (1861-?)
Osborne, Rockwell Colman (1874-?)
Osborne, William Frederick (1873-?)
Osland, Leslie Milton (1921-1993)
Osler, Edmund Boyd (1919-1987)
Osler, Gordon Peter (1922-2012)
Osler, Hugh Farquharson (1881-1943)
Ostapovitch, William Henry (1919-2003)
Ostenso, Martha (1900-1963)
Oster, David B. (c1948-2002)
Ostrander, Alice (1893-1970)
O’Sullivan, Eugene Jean (1868-?)
O’Sullivan, Joseph Francis (1927-1992)
Oswald, Gregory Mark (1955-2008)
Over, Walter Percy (1874-?)
Owen, David Dale (1807-1860)
Owen, William R. (1864-?)
Owens, Dalton Oswald (1893-1964)
Oxton, Stephen Clifford (1870-1927)