| Author | Titles | | 1.
| Orton, Ian | 1 | | 2.
| Orts, Carles Cortés, 1968- | 0 | | 3.
| Author is: Cortés, Carles, 1968- | 7 | | 4.
| Orts, Carles Cortés i, 1968- | 0 | | 5.
| Author is: Cortés, Carles, 1968- | 7 | | 6.
| Ortsman, Oscar, 1935- | 1 | | 7.
| Ortugão, Antonio de Macedo Ramalho | 1 | | 8.
| Ortuño, Gabriel, 1961- | 1 | | 9.
| Ortuño, Pancho | 1 | | 10.
| Oruê, Marina | 1 | | 11.
| Orueta, Ricardo de | 2 | | 12.
| Orvell, Miles | 3 |
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