| Author | Titles | | 1.
| Olazabal, Pedro de | 1 | | 2.
| Olbert, Ernst A., pseud. | 1 | | 3.
| Olbrich, Harold | 3 | | 4.
| Olcay, Nekriman | 2 | | 5.
| Ölçer, Nazan | 2 | | 6.
| Olcina i Aya, Emili | 10 | | 7.
| The Old Chapel Graphic Design (Firma de Design) | 1 | | 8.
| Old Pinakothek in Munich (Alemanha) | 0 | | 9.
| Author is: Alte Pinakothek (Munique, Alemanha) | 8 | | 10.
| Old Truman Brewery (Londres, Grã-Bretanha) | 1 | | 11.
| Old Yacht Club. Sirius Project (Cobh, Irlanda) | 1 |
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