This is a list of International Congresses of Mathematicians Plenary and Invited Speakers. Being invited to talk at an International Congress of Mathematicians has been called "the equivalent, in this community, of an induction to a hall of fame."[1] The current list of Plenary and Invited Speakers presented here is based on the ICM's post-WW II terminology, in which the one-hour speakers in the morning sessions are called "Plenary Speakers" and the other speakers (in the afternoon sessions) whose talks are included in the ICM published proceedings are called "Invited Speakers". In the pre-WW II congresses the Plenary Speakers were called "Invited Speakers".
During the 1900 Congress in Paris, France, David Hilbert (pictured) announced his famous list of Hilbert's problems.[2]
At the 1954 Congress of Mathematicians in Amsterdam, Richard Brauer announced his program for the classification of finite simple groups.[5]
Alexander Grothendieck (pictured) in his plenary lecture at the 1958 Congress outlined his programme "to create arithmetic geometry via a (new) reformulation of algebraic geometry, seeking maximal generality."[6]
At the 1962 Congress in Stockholm Kiyosi Itô (pictured) lectured on how to combine differential geometry and stochastic analysis, and this led to major advances in the 60s and 70s.[7]
There were thirty-one Invited Addresses (eight in Abstract) at the 1966 congress.[8]
This list inventories the mathematicians who were the most invited to speak to an ICM.
| Rank | Name | Years | Nationality | |
|---|---|---|---|---|
| 1 | Jacques Hadamard | 9 | 1897, 1900, 1904, 1908, 1912, 1920, 1928, 1932, 1950 |  |
| 2 | Émile Borel | 7 | 1897, 1900, 1904, 1908, 1912, 1928, 1936 | |
| 2 | Jules Drach | 7 | 1900, 1912, 1920, 1924, 1928, 1932, 1936 | |
| 4 | Elie Cartan | 6 | 1900, 1920, 1924, 1928, 1932, 1936 | |
| 4 | Gino Loria | 6 | 1897, 1904, 1908, 1912, 1928, 1932 |  |
| 4 | Vito Volterra | 6 | 1900, 1904, 1908, 1912, 1920, 1928 | |
| 7 | Henri Fehr | 5 | 1904, 1908, 1912, 1924, 1932 |  |
| 7 | Rudolf Fueter | 5 | 1920, 1924, 1928, 1932, 1936 | |
| 7 | Yuri Manin | 5 | 1966, 1970, 1978, 1986, 1990 |  |
| 7 | Mihailo Petrović | 5 | 1908, 1912, 1924, 1928, 1932 |  |
| 7 | Cyparissos Stephanos | 5 | 1897, 1900, 1904, 1908, 1912 |  |
| 7 | Carl Størmer | 5 | 1908, 1920, 1924, 1932, 1936 |  |
| 7 | Gheorghe Țițeica | 5 | 1908, 1912, 1924, 1932, 1936 |  |
| 7 | Stanisław Zaremba | 5 | 1908, 1920, 1924, 1932, 1936 |  |