| Last Name Sort descending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Banach | S. | 1936 | Oslo | Plenary |
| Bauer | Heinz | 1974 | Vancouver | Plenary |
| Bellman | R. | 1966 | Moskva | Plenary |
| Bernstein | S. | 1932 | Zurich | Plenary |
| Bestvina | Mladen | 2022 | Virtual | Plenary Lecture |
| Beurling | A. | 1950 | Cambridge (USA) | Plenary |
| Bhargava | Manjul | 2014 | Seoul | Plenary/Prize winner |
| Bhatt | Bhargav | 2022 | Virtual | Plenary Lecture |
| Bieberbach | Ludwig | 1932 | Zurich | Plenary |
| Birkar | Caucher | 2018 | Rio de Janeiro | Plenary/Prize winner |
| Birkhoff | G. D. | 1928 | Bologna | Plenary |
| Birkhoff | G. D. | 1936 | Oslo | Plenary |
| Bismut | Jean-Michel | 1998 | Berlin | Plenary |
| Bjerknes | V. | 1936 | Oslo | Plenary |
| Bloch | Spencer | 1990 | Kyoto | Plenary |
| Bôcher | Maxime | 1912 | Cambridge | Plenary |
| Bochner | S. | 1950 | Cambridge (USA) | Plenary |
| Bogolyubov | N. N. | 1958 | Edinburgh | Plenary |
| Bohr | Harald | 1932 | Zurich | Plenary |
| Bombieri | Enrico | 1974 | Vancouver | Plenary/Prize winner |
| Borcherds | Richard E. | 1998 | Berlin | Plenary/Prize winner |
| Borel | A. | 1962 | Stockholm | Plenary |
| Borel | É. | 1912 | Cambridge | Plenary |
| Borel | Émile | 1928 | Bologna | Plenary |
| Borodin | Alexei | 2014 | Seoul | Plenary |