| Author | Titles | | 1.
| O'Rourke, Karen | 1 | | 2.
| O'Rourke, Meg | 1 | | 3.
| Oroveanu, Anca | 1 | | 4.
| Oroz, Jose | 1 | | 5.
| Orozco Díaz, Emilio | 2 | | 6.
| Orozco, Gabriel, 1962- | 15 | | 7.
| Orozco, José Clemente, 1883-1949 | 1 | | 8.
| Orpheus Gallery (Belfast) | 1 | | 9.
| Orr, Boyd | 1 | | 10.
| Orr, Chris, 1943- | 2 |
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