| Author | Titles | | 1.
| Oris House of Architecture (Zagreb, Croácia) | 2 | | 2.
| Orizet, Hélène | 1 | | 3.
| Orjis, Richard, 1979- | 1 | | 4.
| Orlan, 1947- | 2 | | 5.
| Orlandi, Enzo | 1 | | 6.
| Orlandi, Giovanni | 1 | | 7.
| Orlandi, Pellegrino Antonio | 1 | | 8.
| Orlandi, Sandro | 1 | | 9.
| Orlandini, Piero | 1 | | 10.
| Orlando, Anna | 1 |
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