Authors: O
- Ossendowski, Ferdynand Antoni 1878-1945
- Ossiannilsson, K. G. (Karl Gustav) 1875-1970
- Ostaijen, Paul van 1896-1928
- Ostenso, Martha 1900-1963
- Østergaard, Vilhelm 1852-1928
- Österling, Anders 1884-1981
- Osterloh, Agnes -
- Ostertag, Blanche -
- Ostier, Marianne 1902-1976
- Ostrander, Isabel 1883-1924
- Ostrander, Stephen M. -
- Ostrovsky, Aleksandr Nikolaevich 1823-1886
- Ostwald, Hans 1873-1940
- Ostwald, Wilhelm 1853-1932
- O'Sullivan, Vincent 1868-1940
- Oswald, Felix L. (Felix Leopold) 1845-1906
- Oswell, G. D. (George Devereux) 1851-1910
- Othegraven, Reinhold Pfahler von -
- Othman, Ossama -
- Otis, Charles Herbert 1886-
- Otis, Charles P. (Charles Pomeroy) 1840-1888
- Otis, Elizabeth -
- Otis H. Kean & Co. -
- Otis, James 1848-1912
- Otis, Sarah Elizabeth Birdsall 1872-1940
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