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- O'Harra, Edwin V. -
- Ohrenschall, Helen E. -
- Oikonomides, D. E. (Demosthenes E.) 1858-1938
- Okellos, ho Leukanos, active 6th century B.C. -
- Oland, Edith 1878-1968
- Old Elizabeth 1766-
- Oldmeadow, Ernest 1867-1949
- O'Leary, De Lacy 1872-1957
- Oliver, Eda A. -
- Ollier, Edmund 1827-1886
- Ollilainen, A. E. -
- Olmstead, A. T. (Albert Ten Eyck) 1880-1945
- Olmsted, Everett Ward 1869-
- Olsen, Julius E. -
- Olson, Ernst W. (Ernst Wilhelm) 1870-1958
- Olson, Julius E. -
- Öman, Victor Emanuel 1833-1904
- O'Neill, Elizabeth (Elizabeth Speakman) 1877-
- O'Neill, Eugene 1888-1953
- Ontario. Department of Education -
- Opdycke, Leonard Eckstein 1858-1914
- Opie, Eugene L. (Eugene Lindsay) 1873-1971
- Oppenheim, E. Phillips (Edward Phillips) 1866-1946
- Orchard, W. E. (William Edwin) 1877-1955
- Orczy, Emmuska Orczy, Baroness 1865-1947