| Artist | Titles | 1.
| Oldenburg, Claes, 1929-2022, sculptor. | 183 | 2.
| Oldenburg, Claes Thure, 1929-2022, sculptor. | 0 | 3.
| See: Oldenburg, Claes, 1929-2022, sculptor. | 183 | 4.
| Oldfield, Helen Clark, 1902-1981, painter. | 1 | 5.
| Oldfield, Helen Regina Clark, 1902-1981, painter. | 0 | 6.
| See: Oldfield, Helen Clark, 1902-1981, painter. | 1 | 7.
| Oldfield, Otis, 1890-1969, painter. | 61 | 8.
| Oldfield, Otis William, 1890-1969, painter. | 0 | 9.
| See: Oldfield, Otis, 1890-1969, painter. | 61 | 10.
| Oldham and Seltz, architectural firm. | 0 | 11.
| See: Oldham & Seltz, architectural firm. | 6 | 12.
| Oldham & Seltz, architectural firm. | 6 | 13.
| Oldmixon, Ellen, 1816-1896, painter. | 0 | 14.
| See: Sully, Ellen Oldmixon, 1816-1896, painter. | 6 | 15.
| Oldmixon, painter. | 11 |
|