| Last Name Sort descending | First Name | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Masser | D.W. | 1983 | Warszawa | Number Theory |
| Mastropietro | Vieri | 2010 | Hyderabad | Mathematical Physics |
| Masur | Howard | 1994 | Zurich | Real & Complex Analysis |
| Matano | Hiroshi | 1994 | Zurich | Part. Diff. Equations |
| Máthé | András | 2018 | Rio de Janeiro | Analysis and Operator Algebras |
| Mather | J. N. | 1986 | Berkeley | Ordinary Differential Equations and Dynamic Systems |
| Mather | John N. | 1974 | Vancouver | Differential Geometry & Analysis on Manifolds |
| Mathieu | Oliver | 1990 | Kyoto | Lie Groups & Representation |
| Matijasevič | Yu. V. | 1970 | Nice | Mathematical Logic |
| Matomäki | Kaisa | 2018 | Rio de Janeiro | Number Theory |
| Matousek | Jiri | 1998 | Berlin | Combinatorics |
| Matsuki | Toshihiko | 1990 | Kyoto | Lie Groups & Representation |
| Matsusaka | T. | 1958 | Edinburgh | Algebraic & Differential Geometry |
| Matthews | Geoffrey | 1974 | Vancouver | History and Education |
| Mattila | Pertti | 1998 | Berlin | Analysis |
| Maulik | Davesh | 2014 | Seoul | Algebraic and Complex Geometry |
| Maurey | Bernard | 1974 | Vancouver | General Topology, Real & Functional Analysis |
| Mayboroda | Svitlana | 2018 | Rio de Janeiro | Analysis and Operator Algebras |
| Maynard | James | 2018 | Rio de Janeiro | Number Theory |
| Maynard | James | 2022 | Virtual | Plenary/Prize winner |
| Mayr | Karl | 1936 | Oslo | Analysis |
| Mazur | B. | 1974 | Vancouver | Number Theory |
| Mazur | B. | 1983 | Warszawa | Plenary |
| Mazur | S. | 1936 | Oslo | Analysis |
| Mazurkiewicz | S. | 1928 | Bologna | Analysis |