| Last Name Sort descending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Postnikov | A. C. | 1966 | Moskva | Plenary |
| Pretorius | Frans | 2022 | Virtual | Special Plenary Lecture |
| Puppini | Umberto | 1928 | Bologna | Plenary |
| Quarteroni | Alfio | 2006 | Madrid | Plenary |
| Quillen | Daniel | 1974 | Vancouver | Plenary |
| Rabin | M. | 1983 | Warszawa | Plenary |
| Ratner | Marina | 1994 | Zurich | Plenary |
| Reshetikhin | Nicolai | 2010 | Hyderabad | Plenary |
| Riesz | Frédéric | 1932 | Zurich | Plenary |
| Ritt | J. F. | 1950 | Cambridge (USA) | Plenary |
| Rödl | Vojtĕch | 2014 | Seoul | Plenary |
| Rome | A. | 1950 | Cambridge (USA) | Plenary |
| Roth | K. F. | 1958 | Edinburgh | Plenary/Prize winner |
| Ruelle | D. | 1983 | Warszawa | Plenary |
| Safarevic | I. R. | 1962 | Stockholm | Plenary |
| Saint-Raymond | Laure | 2022 | Virtual | Plenary Lecture |
| Sarnak | Peter | 1998 | Berlin | Plenary |
| Sato | M. | 1983 | Warszawa | Plenary |
| Schiffer | M. | 1958 | Edinburgh | Plenary |
| Schmid | W. | 1978 | Helsinki | Plenary |
| Schmidt | Wolfgang M. | 1974 | Vancouver | Plenary |
| Schoen | R. | 1986 | Berkeley | Plenary |
| Schoen | Richard | 2010 | Hyderabad | Plenary |
| Scholze | Peter | 2018 | Rio de Janeiro | Plenary/Prize winner |
| Schönhage | A. | 1986 | Berkeley | Plenary |