| Last Name | First Name | Year | City Sort descending | Section/Speaker Type |
|---|---|---|---|---|
| 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 |
| Laumon | Gérard | 2006 | Madrid | Number Theory |
| Le Bris | Claude | 2006 | Madrid | Applications of Mathematics in the Sciences |
| Le Calvez | Patrice | 2006 | Madrid | Ordinary Differential Equations and Dynamical Systems |
| Le Jan | Yves | 2006 | Madrid | Probability and Statistics |
| Lee | Pengyee | 2006 | Madrid | Mathematics Education and Popularization of Mathematics |
| LeVeque | Randall J. | 2006 | Madrid | Numerical Analysis and Scientific Computing |
| Levermore | David | 2006 | Madrid | Applications of Mathematics in the Sciences |
| Lindenstrauss | Elon | 2006 | Madrid | Ordinary Differential Equations and Dynamical Systems |
| Liu | Xiaobo | 2006 | Madrid | Geometry |
| Luczak | Tomasz | 2006 | Madrid | Combinatorics |
| Mabuchi | Toshiki | 2006 | Madrid | Geometry |
| Maday | Yvon | 2006 | Madrid | Numerical Analysis and Scientific Computing |