Authors: O
- O'Connor, Patrick 1915-1983
- O'Connor, T. P. (Thomas Power) 1848-1929
- O'Connor, William Douglas 1832-1889
- O'Connor, William Frederick Travers, Sir 1870-1943
- O'Conor, J. F. X. (John Francis Xavier) 1852-1920
- O'Danachair, Donal -
- Oddo, Henri 1844-1906
- Odell, E. G. 1886-1929
- Odell, Samuel W. 1864-1948
- Odhner, Einar 1884-1973
- Odle, E. V. (Edwin Vincent) 1890-1942
- O'Donnell, Elliott 1872-1965
- O'Donoghue, D. J. (David James) 1866-1917
- O'Donoghue, Power, Mrs. 1858-
- O'Donovan Rossa, Jeremiah 1831-1915
- Odum, Howard Washington 1884-1954
- Oeffinger, Rudolf 1870-1952
- Oehlenschläger, Adam 1779-1850
- Oehler, Gottlieb F. -
- Oehninger, Friedrich 1837-1914
- Oelschlager, Charlotte 1898-1984
- Oelsner, Herman 1871-
- Oemler, Marie Conway 1879-1932
- Oertel, Hugo -
- Oer, T. von -
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