| Author | Titles | | 1.
| Opitz, Hellmut | 1 | | 2.
| Opolka, Uwe | 1 | | 3.
| Oporto (Lisboa, Portugal) | 1 | | 4.
| Oporto Suburban Youth | 1 | | 5.
| OPOSITO Group d'Art | 1 | | 6.
| Oppé, A. P. | 1 | | 7.
| Oppen, Christian, 1971- | 1 | | 8.
| Oppen, Konrad von | 1 | | 9.
| Oppenheim, Dennis, 1938-2011 | 7 | | 10.
| Oppenheim, Edward Phillips | 8 |
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