| Author | Titles | | 1.
| Okuyama, Mayumi | 2 | | 2.
| Olabarri, Galder Reguera, 1975- | 0 | | 3.
| Author is: Reguera, Galder, 1975- | 14 | | 4.
| Olabuénaga, José Ignacio Ruiz, 1929-2014 | 0 | | 5.
| Author is: Ruiz Olabuénaga, José Ignacio, 1929-2014 | 1 | | 6.
| Olaf, Erwin, 1959-2023 | 1 | | 7.
| Ólafsdóttir, Ádis | 1 | | 8.
| Olaio, António, 1963- | 77 | | 9.
| Olaio Filho, Pedro, 1930- | 0 | | 10.
| Author is: Olayo Filho, Pedro, 1930- | 3 | | 11.
| Olaio, Ludgera Maggiolly, 1900-? | 1 | | 12.
| Olaio, Pedro, 1903-1997 | 1 | | 13.
| Olaio, Pedro, 1930- | 0 | | 14.
| Author is: Olayo Filho, Pedro, 1930- | 3 |
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