| Author | Titles | 1.
| Omoto, Keiko | 1 | 2.
| Omura, Rieko | 1 | 3.
| Omura, Seigai, 1868-1927 | 1 | 4.
| On Kawara 1933-2014 | 0 | 5.
| Author is: Kawara, On, 1933-2014 | 1 | 6.
| Onaka, Koji, 1960- | 2 | 7.
| Onasch, Konrad | 1 | 8.
| Onassis, Jacqueline | 1 | 9.
| Onciulescu, Teodoro | 2 | 10.
| Oncken, Hermann | 1 | 11.
| Oncken, Wilhelm, 1838-1905 | 1 |
|
|