| Last Name | First Name Sort descending | Year | City | Section/Speaker Type |
|---|---|---|---|---|
| He | Xuhua | 2018 | Rio de Janeiro | Lie Theory and Generalizations |
| Zhou | Xunyu | 2010 | Hyderabad | Mathematics in Science and Technology |
| Colin De Verdière | Y. | 1986 | Berkeley | Geometry |
| Karamata | Y. | 1928 | Bologna | Analysis |
| Meyer | Y. | 1983 | Warszawa | Real & Func. Analy. |
| Ritov | Y. | 2002 | Beijing | Prob & Stats |
| Siu | Y. -T. | 1978 | Helsinki | Complex Analysis |
| Manin | Y. I. | 1970 | Nice | Algebra |
| Peterzil | Ya'acov | 2010 | Hyderabad | Logic |
| Yuan | Ya-xiang | 2014 | Seoul | Numerical Analysis and Scientific Computing, Control Theory and Optimization |
| Pesin | Ya. | 1986 | Berkeley | Ordinary Differential Equations and Dynamic Systems |
| Sinai | Ya. G. | 1978 | Helsinki | Mathematical Physics & Mechanics |
| Eliashberg | Ya. M. | 1986 | Berkeley | Geometry |
| Kalai | Yael | 2018 | Rio de Janeiro | Mathematical Aspects of Computer Science |
| Minsky | Yair | 2006 | Madrid | Topology |
| Eliashberg | Yakov | 1998 | Berlin | Differential Geometry and Global Analysis |
| Eliashberg | Yakov | 2006 | Madrid | Plenary |
| Sinai | Yakov G. | 1990 | Kyoto | Plenary |
| Efendiev | Yalchin | 2014 | Seoul | Numerical Analysis and Scientific Computing |
| Brenier | Yann | 2002 | Beijing | Application of Mathematics in the Sciences |
| Li | YanYan | 2002 | Beijing | Part. Diff. Equations |
| Ostrover | Yaron | 2014 | Seoul | Geometry, Dynamical Systems and Ordinary Differential Equations |
| Ihara | Yasutaka | 1970 | Nice | Algebra |
| Ihara | Yasutaka | 1990 | Kyoto | Plenary |
| Kawahigashi | Yasuyuki | 2018 | Rio de Janeiro | Analysis and Operator Algebras, Mathematical Physics |