| Last Name Sort descending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Wall | C. T. C. | 1970 | Nice | Plenary |
| Wavre | Rolin | 1932 | Zurich | Plenary |
| Weil | A. | 1954 | Amsterdam | Plenary |
| Weil | A. | 1978 | Helsinki | Plenary |
| Weyl | Hermann | 1928 | Bologna | Plenary |
| Whitehead | Sir W.H. | 1912 | Cambridge | Plenary |
| Whitney | H. | 1950 | Cambridge (USA) | Plenary |
| Wielandt | H. | 1958 | Edinburgh | Plenary |
| Wiener | N. | 1950 | Cambridge (USA) | Plenary |
| Wiener | Norbert | 1936 | Oslo | Plenary |
| Wigderson | Avi | 1994 | Zurich | Plenary/Prize winner |
| Wigderson | Avi | 2006 | Madrid | Plenary |
| Wilder | R. L. | 1950 | Cambridge (USA) | Plenary |
| Wiles | Andrew | 1994 | Zurich | Plenary |
| Williamson | Geordie | 2018 | Rio de Janeiro | Plenary |
| Wirtinger | W. | 1904 | Heidelberg | Plenary |
| Witten | E. | 1986 | Berkeley | Plenary |
| Witten | E. | 2002 | Beijing | Plenary |
| Woodin | Hugh | 2010 | Hyderabad | Plenary |
| Yau | S. -T. | 1978 | Helsinki | Plenary |
| Yoccoz | Jean-Christophe | 1994 | Zurich | Plenary/Prize winner |
| Yosida | K. | 1954 | Amsterdam | Plenary |
| Young | Lai-Sang | 2018 | Rio de Janeiro | Plenary |
| Young | W. H. | 1928 | Bologna | Plenary |
| Young | W.H. | 1924 | Toronto | Plenary |