| Author | Titles | | 1.
| Ockham, Guillemus de, ca 1285-ca 1350 | 1 | | 2.
| Ockman, Joan | 2 | | 3.
| Ocón, Dulce | 1 | | 4.
| O'Connor, Aidan | 1 | | 5.
| O'Connor, Anne | 2 | | 6.
| O'Connor, Francis Valentine | 2 | | 7.
| O'Connor, Harvey | 1 | | 8.
| O'Connor, John | 1 | | 9.
| O'Connor, John, 1945- | 4 | | 10.
| O'Connor, Richard, 1915-1975 | 1 |
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