| Last Name | First Name | Year | City | Section/Speaker Type Sort descending |
|---|---|---|---|---|
| Caffarelli | Luis A. | 2002 | Beijing | Plenary |
| Calderon | P. | 1978 | Helsinki | Plenary |
| Candes | Emmanuel | 2014 | Seoul | Plenary |
| Cantor | Moritz | 1900 | Paris | Plenary |
| Carathéodry | C. | 1932 | Zurich | Plenary |
| Carleman | Torsten | 1932 | Zurich | Plenary |
| Carleson | L. | 1966 | Moskva | Plenary |
| Cartan | Élie | 1924 | Toronto | Plenary |
| Cartan | Elie | 1932 | Zurich | Plenary |
| Cartan | Elie | 1936 | Oslo | Plenary |
| Cartan | H. | 1950 | Cambridge (USA) | Plenary |
| Cartan | H. | 1958 | Edinburgh | Plenary |
| Castelnuovo | Guido | 1928 | Bologna | Plenary |
| Chang | Sun-Yung Alice | 2002 | Beijing | Plenary |
| Chern | S. S. | 1950 | Cambridge (USA) | Plenary |
| Chern | Shiing-Shen | 1970 | Nice | Plenary |
| Chevalley | C. | 1958 | Edinburgh | Plenary |
| Christodoulou | Demetrios | 2014 | Seoul | Plenary |
| Church | A. | 1962 | Stockholm | Plenary |
| Connes | A. | 1978 | Helsinki | Plenary |
| Conway | John H. | 1994 | Zurich | Plenary |
| Cook | Stephen A. | 1990 | Kyoto | Plenary |
| Coron | Jean-Michel | 2010 | Hyderabad | Plenary |
| Corput | J. van der | 1936 | Oslo | Plenary |
| Darboux | G. | 1908 | Rome | Plenary |