| Author | Titles | | 1.
| Omont, Henri Auguste | 1 | | 2.
| O'More, Haven | 1 | | 3.
| Omoto, Keiko | 1 | | 4.
| Omura, Rieko | 1 | | 5.
| Omura, Seigai, 1868-1927 | 1 | | 6.
| On Kawara 1933-2014 | 0 | | 7.
| Author is: Kawara, On, 1933-2014 | 1 | | 8.
| Onaka, Koji, 1960- | 2 | | 9.
| Onasch, Konrad | 1 | | 10.
| Onassis, Jacqueline | 1 | | 11.
| Onciulescu, Teodoro | 2 |
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