Authors: T Williams
- Oberhardt, William 1882-1958
- O'Brien, William 1852-1928
- O'Brien, William D. -
- O'Connor, William Douglas 1832-1889
- O'Connor, William Frederick Travers, Sir 1870-1943
- Oesterley, W. O. E. (William Oscar Emil) 1866-1950
- Ogilvie-Grant, W. R. (William Robert) 1863-1924
- Ogilvie, William 1688-1729
- Olcott, William Tyler 1873-1936
- Oldfather, W. A. (William Abbott) 1880-1945
- Oman, Charles 1860-1946
- Omond, George W. T. (George William Thomson) 1846-1929
- Optic, Oliver 1822-1897
- Orchard, W. E. (William Edwin) 1877-1955
- Orcutt, William Dana 1870-1953
- O'Reilly, Charles William -
- Orpen, William, Sir 1878-1931
- Orr, John William 1815-1887
- Osborne, William H. -
- Osborne, William Hamilton 1873-1942
- O'Shaughnessy, Arthur William Edgar 1844-1881
- O'Shaughnessy, W. B. 1809-1889
- Osler, William, Sir 1849-1919
- Osmer, William -
- Ouseley, William 1767-1842
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