| Author | Titles | | 1.
| Orgeix, Emilie d' | 1 | | 2.
| Orgel, Stephen | 1 | | 3.
| Orgogozo, Chantal | 2 | | 4.
| Oriales, Angel | 1 | | 5.
| Oriano, Michel | 1 | | 6.
| Orico, Osvaldo, 1900-1981 | 9 | | 7.
| Oriel Glef Glynn Vivian Art Gallery (Swansea, Grã-Bretanha) | 2 | | 8.
| Oriel Mostyn Gallery (Llandudno, Grã-Bretanha) | 2 | | 9.
| Oriel Mostyn (Gwyneedd, Grã-Bretanha) | 2 | | 10.
| The Oriental Art Magazine | 1 |
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