| Author | Titles | | 1.
| Oppenheimer, Max, 1885-1954 | 1 | | 2.
| Oppenheimer, Sarah, 1972- | 1 | | 3.
| Opper, Thorsten | 1 | | 4.
| Oppert, Jules, 1825-1905 | 2 | | 5.
| Oppetit, Danielle | 1 | | 6.
| Oppicelli, Ernesto G. | 5 | | 7.
| Opptiz, Michael | 1 | | 8.
| Oppy, Graham | 2 | | 9.
| O'Pray, Michael | 1 | | 10.
| Oprea, Ion | 1 |
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