| Author | Titles | | 1.
| Ortugão, Antonio de Macedo Ramalho | 1 | | 2.
| Ortuño, Gabriel, 1961- | 1 | | 3.
| Ortuño, Pancho | 1 | | 4.
| Oruê, Marina | 1 | | 5.
| Orueta, Ricardo de | 2 | | 6.
| Orvell, Miles | 3 | | 7.
| Orviales, Angee | 1 | | 8.
| Orwell, George, pseud. | 3 | | 9.
| Orwicz, Michael | 1 | | 10.
| Ory, Jean-Jacques, 19--?- | 1 |
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