Authors: O
- Opdycke, Leonard Eckstein 1858-1914
- Open Court Publishing Company -
- Operti, Albert 1852-1927
- Opie, Amelia 1769-1853
- Opie, Eugene L. (Eugene Lindsay) 1873-1971
- Opie, John 1761-1807
- Opitz, Martin 1597-1639
- Oppeln-Bronikowski, Friedrich von 1873-1936
- Oppenheim, E. Phillips (Edward Phillips) 1866-1946
- Oppenheimer, Franz 1864-1943
- Oppenheim, J. -
- Oppenheim, James 1882-1932
- Oppenheim, L. (Lassa) 1858-1919
- Oppenheim, Max, Freiherr von 1860-1946
- Oppenheim, M. (Michael) 1853-1927
- Opper, Frederick Burr 1857-1937
- Opp, Julie 1871-1921
- Oppman, Artur 1867-1932
- Optic, Oliver 1822-1897
- Orage, A. R. (Alfred Richard) 1873-1934
- Oratorio Chorus -
- Oravala, Aukusti Alfred 1869-1951
- Orbaan, Albert 1913-1983
- Orbán, Balázs 1830-1890
- Orban, Paul 1896-1974
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