| Author | Titles | | 1.
| OPOSITO Group d'Art | 1 | | 2.
| Oppé, A. P. | 1 | | 3.
| Oppen, Christian, 1971- | 1 | | 4.
| Oppen, Konrad von | 1 | | 5.
| Oppenheim, Dennis, 1938-2011 | 7 | | 6.
| Oppenheim, Edward Phillips | 8 | | 7.
| Oppenheim, Emil, -1982 | 1 | | 8.
| Oppenheim, Leo | 1 | | 9.
| Oppenheim, Max Von | 1 | | 10.
| Oppenheim, Méret, 1913-1985 | 1 |
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