| Author | Titles | | 1.
| Oshima, Mark | 1 | | 2.
| Oshima, Nagisa, 1932-2013 | 2 | | 3.
| Osio, Agostino | 2 | | 4.
| Oskar, 1913-1995 | 0 | | 5.
| Author is: Lobo, Óscar Pinto, 1913-1995 | 19 | | 6.
| Oskar Kokoschka, 1886-1980 | 0 | | 7.
| Author is: Kokoschka, Oskar, 1886-1980 | 13 | | 8.
| Oskar Pinto Lobo, 1913-1995 | 0 | | 9.
| Author is: Lobo, Óscar Pinto, 1913-1995 | 19 | | 10.
| Oskian, Hamazasp, 1895-1968 | 2 | | 11.
| Oskian, P. Hamazasp | 1 | | 12.
| Osler, Mirabel | 1 | | 13.
| Osler, Patricia | 1 |
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