| Artist | Titles | 1.
| Oberteuffer, George, 1878-1940, painter. | 32 | 2.
| Oberteuffer, Henriette Amiard, 1878-1962, painter. | 17 | 3.
| Oblak, Mario, sculptor. | 1 | 4.
| O'Boyle, Bob, architect. | 1 | 5.
| O'Boyle, Cowell, Rohrer and Associates, landscape architect. | 1 | 6.
| O'Boyle, John H., painter. | 1 | 7.
| O'Brian, John, sculptor. | 1 | 8.
| O'Brian, sculptor. | 1 | 9.
| O'Brien, Charles S., sculptor. | 3 | 10.
| O'Brien, David, sculptor. | 1 |
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