| Last Name | First Name Sort ascending | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| Kawamata | Yujiro | 1990 | Kyoto | Algebraic Geometry |
| Tachikawa | Yuji | 2018 | Rio de Janeiro | Invited (lecture was not given) |
| Chekanov | Yu. V. | 2002 | Beijing | Topology |
| Linnik | Yu. V. | 1958 | Edinburgh | Algebra & Theory of Numbers |
| Matijasevič | Yu. V. | 1970 | Nice | Mathematical Logic |
| Svirezhev | Yu. M. | 1983 | Warszawa | New Applications of Mathematics |
| Manin | Yu. I. | 1966 | Moskva | Algebraic geometry & complex manifolds |
| Manin | Yu. I. | 1986 | Berkeley | Mathematical Physics |
| Kuznetsov | Yu. A. | 1983 | Warszawa | Numerical methods |
| Dai | Yu Hong | 2022 | Virtual | Control Theory and Optimization |
| Ogata | Yoshiko | 2022 | Virtual | Mathematical Physics |
| Giga | Yoshikazu | 2018 | Rio de Janeiro | Partial Differential Equations |
| Last | Yoram | 2010 | Hyderabad | Mathematical Physics |
| Ruan | Yongbin | 1998 | Berlin | Differential Geometry and Global Analysis |
| Oh | Yong-Geun | 2006 | Madrid | Geometry |
| Miyaoka | Yoichi | 1994 | Zurich | Algebraic Geometry |
| Zhang | Yitang | 2014 | Seoul | Number Theory |
| Long | Yiming | 2002 | Beijing | Differential Geometry |
| Moschovakis | Yiannis N. | 1974 | Vancouver | Mathematical Logic and the Foundations of Mathematics |
| Sakellaridis | Yiannis | 2022 | Virtual | Lie Theory and Generalizations |
| Liu | Yi | 2022 | Virtual | Topology |
| Shalom | Yehuda | 2006 | Madrid | Lie Groups and Lie Algebras |
| Tian | Ye | 2022 | Virtual | Number Theory |
| Kawahigashi | Yasuyuki | 2018 | Rio de Janeiro | Analysis and Operator Algebras, Mathematical Physics |
| Ihara | Yasutaka | 1970 | Nice | Algebra |