| Last Name Sort descending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Schramm | Oded | 2006 | Madrid | Plenary |
| Schröder | J. | 1966 | Moskva | Plenary |
| Schutte | K. | 1966 | Moskva | Plenary |
| Schwartz | L. | 1950 | Cambridge (USA) | Plenary/Prize winner |
| Segre | B. | 1954 | Amsterdam | Plenary |
| Segre | C. | 1904 | Heidelberg | Plenary |
| Segre | C. | 1908 | Rome | Plenary |
| Selberg | A. | 1962 | Stockholm | Plenary |
| Serfaty | Sylvia | 2018 | Rio de Janeiro | Plenary |
| Serganova | Vera | 2014 | Seoul | Plenary |
| Serre | J. P. | 1962 | Stockholm | Plenary |
| Severi | F. | 1924 | Toronto | Plenary |
| Severi | F. | 1932 | Zurich | Plenary |
| Seymour | Paul | 1994 | Zurich | Plenary |
| Sheffield | Scott | 2022 | Virtual | Plenary Lecture |
| Shelah | S. | 1983 | Warszawa | Plenary |
| Shelah | S. | 1986 | Berkeley | Plenary |
| Shiryayev | A. N. | 1978 | Helsinki | Plenary |
| Shor | Peter W. | 1998 | Berlin | Plenary/Prize winner |
| Siegel | Carl Ludwig | 1936 | Oslo | Plenary |
| Sierpinski | Waclaw | 1932 | Zurich | Plenary |
| Sigmund | Karl | 1998 | Berlin | Plenary |
| Sinai | Yakov G. | 1990 | Kyoto | Plenary |
| Singer | I. M. | 1974 | Vancouver | Plenary |
| Siu | Yum-Tong | 1983 | Warszawa | Plenary |