| Author | Titles | | 1.
| Origin Gallery (Dublin, Irlanda) | 1 | | 2.
| Origo, Benedetta | 1 | | 3.
| O'Riley Tim | 1 | | 4.
| Orio, Roberta, 1966- | 1 | | 5.
| Oriol, Gueorgui | 1 | | 6.
| Oriol Riera, Cosme | 1 | | 7.
| Oriola, Miguel | 1 | | 8.
| Orioli, Nora, 1925- | 1 | | 9.
| O'Riordan, Colum | 1 | | 10.
| Oris House of Architecture (Zagreb, Croácia) | 2 |
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