| Author | Titles | | 1.
| O'Sullivan, William | 1 | | 2.
| Osumi, Tamezo | 1 | | 3.
| Osuna Gallery (Washington D. C., Estados Unidos) | 2 | | 4.
| Osvald, Monika | 1 | | 5.
| Oswald, F., 1866-1958 | 0 | | 6.
| Author is: Oswald, Felix, 1866-1958 | 4 | | 7.
| Oswald, Felix, 1866-1958 | 4 | | 8.
| Oswald, Franz, 1938- | 2 | | 9.
| Oswald, Martin | 1 | | 10.
| Oswaldo, Angelo | 1 | | 11.
| Oswaldo, Goeldi, 1895-1961 | 1 |
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