| Last Name Sort ascending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Chai | Ching-Li | 2006 | Madrid | Number Theory |
| Chacon | R. V. | 1970 | Nice | Analysis |
| Cesari | L. | 1954 | Amsterdam | Analysis |
| Cesari | Lamberto | 1932 | Zurich | Analysis |
| Cernavskii | A. V. | 1970 | Nice | Geometry & Topology |
| Cerf | Georges | 1932 | Zurich | Analysis |
| Cerf | J. | 1966 | Moskva | Topology |
| Cerf | Rafael | 2006 | Madrid | Probability and Statistics |
| Cech | E. | 1928 | Bologna | Geometry |
| Cech | E. | 1932 | Zurich | Geometry |
| Cavalli | E. | 1928 | Bologna | Analysis |
| Cavalli | E. | 1928 | Bologna | Statistics, Mathematical Economics, Probability Calculus, Actuarial Sciences |
| Cauer | W. | 1932 | Zurich | Analysis |
| Cauer | W. | 1932 | Zurich | Mathematical-technical sciences and astronomy |
| Cattaneo | Alberto S. | 2006 | Madrid | Mathematical Physics |
| Catlin | D. | 1986 | Berkeley | Complex Analysis |
| Castro Bonel | H.S. | 1924 | Toronto | Mechanics, Physics, Astronomy, Geophysics |
| Castro | Manuel | 2018 | Rio de Janeiro | Numerical Analysis and Scientific Computing, Mathematics in Science and Technology |
| Castelnuovo | Guido | 1928 | Bologna | Plenary |
| Castelli | G. | 1908 | Rome | Various Applications of Mathematics |
| Castellani | Maria | 1928 | Bologna | Statistics, Mathematical Economics, Probability Calculus, Actuarial Sciences |
| Casson | A. J. | 1978 | Helsinki | Topology |
| Casson | A. J. | 1986 | Berkeley | Topology |
| Cassina | U. | 1928 | Bologna | Elementary Mathematics, Didactical Questions, Mathematical Logic |
| Cassina | U. | 1928 | Bologna | Philosophy, History of Mathematics |