| Author | Titles | | 1.
| Oldani, Alessandro | 2 | | 2.
| Olden, Wolfgang Schulze, | 2 | | 3.
| Oldenberg, Hermann | 2 | | 4.
| Oldenburg, Claes, 1929-2022 | 11 | | 5.
| Oldenburg, Maartje | 1 | | 6.
| Oldenburg, Peter | 1 | | 7.
| Oldenburg, Richard E. | 2 | | 8.
| Oldenziel, Ruth | 1 | | 9.
| Oldfield-Florescu, Sylvia May | 2 | | 10.
| Oldford, Michael | 1 |
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