| Author | Titles | | 1.
| Oursel, Raymond | 8 | | 2.
| Oursel-Quarré, Madeleine | 1 | | 3.
| Oursler, Tony, 1957- | 16 | | 4.
| Oursler, Tony, 1957- | 2 | | 5.
| Ourssel, Paul Masson | 1 | | 6.
| Ouseley, W. Gore | 1 | | 7.
| Ouspensky, Leonid | 1 | | 8.
| Ouspensky, Léonide | 1 | | 9.
| Oustinoff, Elizabeth | 1 | | 10.
| Outcault, Richard Felton, 1863-1928 | 1 |
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