| Author | Titles | | 1.
| Olano Ereña, Luis | 1 | | 2.
| Olaré, pseud. | 0 | | 3.
| Author is: Cabral, António, 1863-1956 | 67 | | 4.
| Olarte, Filipe, 1450-1536 | 0 | | 5.
| Author is: Hodart, Philippe, 1450-1534 | 2 | | 6.
| Olarte, Natalia | 1 | | 7.
| Olasagasti, Eduardo | 1 | | 8.
| Olaso, Ezeqiel de | 1 | | 9.
| O'Laughlin, Bridget | 1 | | 10.
| Olausson, Magnus | 3 | | 11.
| Olavo, 1908-1976 | 0 | | 12.
| Author is: Leal, Olavo de Eça, 1908-1976 | 14 | | 13.
| Olavo, Carlos, 1881-1958 | 7 |
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