| Last Name | First Name | Year Sort ascending | City | Section/Speaker Type |
|---|---|---|---|---|
| Gursky | Matthew | 2006 | Madrid | Partial Differential Equations |
| Haiman | Mark | 2006 | Madrid | Combinatorics |
| Hamilton | Richard | 2006 | Madrid | Plenary |
| Henniart | Guy | 2006 | Madrid | Lie Groups and Lie Algebras |
| Hofmann | Steven | 2006 | Madrid | Analysis |
| Honda | Ko | 2006 | Madrid | Geometry |
| Hwang | Jun-Muk | 2006 | Madrid | Algebraic and Complex Geometry |
| Ishii | Hitoshi | 2006 | Madrid | Partial Differential Equations |
| Iwaniec | Henryk | 2006 | Madrid | Plenary |
| Johnstone | Iain | 2006 | Madrid | Plenary |
| Kaloshin | Vadim | 2006 | Madrid | Ordinary Differential Equations and Dynamical Systems |
| Kapovich | Michael | 2006 | Madrid | Geometry |
| Kato | Kazuya | 2006 | Madrid | Plenary |
| Keller | Bernard | 2006 | Madrid | Algebra |
| Kenderov | Petar | 2006 | Madrid | Mathematics Education and Popularization of Mathematics |
| Khovanov | Mikhail | 2006 | Madrid | Topology |
| Kim | Jeong Han | 2006 | Madrid | Combinatorics |
| Klartag | Boáz | 2006 | Madrid | Operator Algebras and Functional Analysis |
| Kleinberg | Jon M. | 2006 | Madrid | Mathematical Aspects of Computer Science/Prize winner |
| Kleiner | Bruce | 2006 | Madrid | Geometry |
| Kohn | Robert V. | 2006 | Madrid | Plenary |
| Konyagin | Sergey | 2006 | Madrid | Analysis |
| Kra | Bryna | 2006 | Madrid | Ordinary Differential Equations and Dynamical Systems |
| Lalley | Steven | 2006 | Madrid | Probability and Statistics |
| Lalonde | François | 2006 | Madrid | Geometry |