| Author | Titles | | 1.
| Ostwald, Wilhelm, 1853-1932 | 4 | | 2.
| O'Sullivan, Dan | 1 | | 3.
| O'Sullivan, Maura | 1 | | 4.
| O'Sullivan, Oscar | 1 | | 5.
| O'Sullivan, Paul | 2 | | 6.
| O'Sullivan, T. H., 1840-1882 | 0 | | 7.
| Author is: O'Sullivan, Timothy H., 1840-1882 | 1 | | 8.
| O'Sullivan, Timothy H., 1840-1882 | 1 | | 9.
| O'Sullivan, William | 1 | | 10.
| Osumi, Tamezo | 1 | | 11.
| Osuna Gallery (Washington D. C., Estados Unidos) | 2 |
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