| Last Name Sort ascending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Arnold | V. I. | 1966 | Moskva | 1/2 hr. report |
| Arnold | V. I. | 1974 | Vancouver | Plenary |
| Arnold | V. I. | 1983 | Warszawa | Plenary |
| Arnaud | Marie-Claude | 2010 | Hyderabad | Dynamical Systems and Ordinary Differential Equations |
| Arhangelskij | A. V. | 1970 | Nice | Geometry & Topology |
| Argyros | Spiros | 2018 | Rio de Janeiro | Analysis and Operator Algebras |
| Arf | C. | 1950 | Cambridge (USA) | |
| Arens | R. | 1950 | Cambridge (USA) | |
| Ardila | Federico | 2022 | Virtual | Combinatorics |
| Ardakov | Konstantin | 2014 | Seoul | Lie Theory and Generalizations |
| Archibald | R. C. | 1928 | Bologna | Philosophy, History of Mathematics |
| Archibald | R. C. | 1936 | Oslo | Logic, Philosophy, and History |
| Archenhold | F.S. | 1908 | Rome | Philosophy, History, and Didactics |
| Arbarello | E. | 1986 | Berkeley | Algebraic Geometry |
| Araujo | Carolina | 2018 | Rio de Janeiro | Algebraic and Complex Geometry |
| Arany | D. | 1912 | Cambridge | Economics, Actuarial Science, Statistics |
| Arany | D. | 1928 | Bologna | Statistics, Mathematical Economics, Probability Calculus, Actuarial Sciences |
| Araki | H. | 1978 | Helsinki | Mathematical Physics & Mechanics |
| Araki | Huzihiro | 1970 | Nice | Analysis |
| Arakelov | S. J. | 1974 | Vancouver | Algebraic Geometry |
| Arakeljan | N. U. | 1970 | Nice | Analysis |
| Arakawa | Tomoyuki | 2018 | Rio de Janeiro | Lie Theory and Generalizations |
| Arak | T. | 1986 | Berkeley | Probability and Mathematical Statistics |
| Anosov | D. V. | 1966 | Moskva | Ordinary differential equataions |
| Anosov | D. V. | 1974 | Vancouver | Ordinary Differential Equations & Dynamic Systems |