| Last Name | First Name Sort ascending | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Schramm | Oded | 2006 | Madrid | Plenary |
| Regev | Oded | 2022 | Virtual | Mathematics of Computer Science |
| Oniecescu | Octav | 1936 | Oslo | Probability Calculus, Mathematical Statistics, Insurance Mathematics, and Econometry |
| Glenn | O.E. | 1924 | Toronto | Algebra, Theory of Numbers, Analysis |
| Hazlett | O.C. | 1924 | Toronto | Algebra, Theory of Numbers, Analysis |
| Viro | O. Ya. | 1983 | Warszawa | Geometry |
| Besov | O. V. | 1970 | Nice | Analysis |
| Bogoyavlensky | O. I. | 1978 | Helsinki | Geometry |
| Glenn | O. E. | 1928 | Bologna | Analysis |
| Lanford | O. E. | 1986 | Berkeley | Numerical Methods & Computing |
| Hazlett | O. C. | 1928 | Bologna | Analysis |
| Ladyzenskaja | O. A. | 1966 | Moskva | Applied mathematics & mathematical physics |
| Oleinik | O. A. | 1970 | Nice | Analysis |
| Smith | O. A. | 1928 | Bologna | Analysis |
| Blumenthal | O. | 1912 | Cambridge | Mechanics, Physical Mathematics, Astronomy |
| Broggi | O. | 1908 | Rome | Philosophy, History, and Didactics |
| Ladyzenskaya | O. | 1983 | Warszawa | Mathematical physics & mechanics |
| Lehto | O. | 1966 | Moskva | Classical analysis |
| Mühlendyck | O. | 1932 | Zurich | Geometry |
| Neugebauer | O. | 1928 | Bologna | Philosophy, History of Mathematics |
| Neugebauer | O. | 1936 | Oslo | Plenary |
| Nicoletti | O. | 1908 | Rome | Arithmetic, Algebra, Analysis |
| Nikodym | O. | 1928 | Bologna | Analysis |
| Onicescu | O. | 1928 | Bologna | Analysis |
| Ostrowski | O. | 1928 | Bologna | Analysis |