| Last Name Sort descending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Hodge | W. V. D. | 1950 | Cambridge (USA) | Plenary |
| Hofer | Helmut H. | 1998 | Berlin | Plenary |
| Hooley | C. | 1983 | Warszawa | Plenary |
| Hopf | H. | 1950 | Cambridge (USA) | Plenary |
| Hopkins | Michael | 2002 | Beijing | Plenary |
| Hörmander | Lars | 1970 | Nice | Plenary |
| Hrushovski | Ehud | 1998 | Berlin | Plenary |
| Hsiang | Wu-chung | 1983 | Warszawa | Plenary |
| Hughes | Thomas J.R. | 2010 | Hyderabad | Plenary |
| Huh | June | 2022 | Virtual | Plenary/Prize winner |
| Hurewicz | W. | 1950 | Cambridge (USA) | Plenary |
| Hurwitz | A. | 1897 | Zurich | Plenary |
| Hwang | Jun-Muk | 2014 | Seoul | Plenary |
| Ihara | Yasutaka | 1990 | Kyoto | Plenary |
| Iwaniec | Henryk | 2006 | Madrid | Plenary |
| Jessen | B. | 1954 | Amsterdam | Plenary |
| Jitomirskaya | Svetlana | 2022 | Virtual | Plenary Lecture |
| Johnstone | Iain | 2006 | Madrid | Plenary |
| Jones | Peter | 2010 | Hyderabad | Plenary |
| Jones | Vaughan F. R. | 1990 | Kyoto | Plenary/Prize winner |
| Jordan | Michael | 2018 | Rio de Janeiro | Plenary |
| Julia | Gaston | 1932 | Zurich | Plenary |
| Kac | Victor | 2002 | Beijing | Plenary |
| Kahane | J. P. | 1962 | Stockholm | Plenary |
| Kakutani | S. | 1950 | Cambridge (USA) | Plenary |