Authors: O
- Ortega y Frías, Ramón 1825-1883
- Ortega y Gasset, José 1883-1955
- Orth, Samuel Peter 1873-1922
- Ortigão, Ramalho 1836-1915
- Ortiz, Cornelia -
- Ortman, Blanche Sellers 1870-1948
- Ortoli, Jean-Baptiste Frédéric 1861-
- Orton, Arthur W. -
- Orton, George W. 1873-1958
- Orton, Helen Fuller 1872-1955
- Orton, James 1830-1877
- Orts-Ramos, Tomás 1866-1939
- Ortt, Felix 1866-1959
- Orvieto, Angiolo 1869-1967
- Orvis, C. F. (Charles Frederick) 1831-1915
- Orwig, Louise -
- Orzeszkowa, Eliza 1842-1910
- Osborne, Carolyn M. -
- Osborne, David, Mrs. (Fanny) -
- Osborne, Dorothy 1627-1695
- Osborne, Duffield 1858-1917
- Osborne, Norman J. L. (Norman James Lionel) 1878-1965
- Osborne, Oliver T. (Oliver Thomas) 1862-1940
- Osborne, Robertson -
- Osborne, Thomas Mott 1859-1926
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