| Last Name | First Name | Year | City Sort descending | Section/Speaker Type |
|---|---|---|---|---|
| Renegar | James | 1990 | Kyoto | Computational Methods |
| Reshetikhin | Nicolai | 1990 | Kyoto | Mathematical Physics |
| Roberts | Paul C. | 1990 | Kyoto | Algebra |
| Rödl | Vojtech | 1990 | Kyoto | Combinatorics |
| Roggenkamp | Klaus W. | 1990 | Kyoto | Algebra |
| Saito | Kyoji | 1990 | Kyoto | Real & Complex Analysis |
| Saito | Morihiko | 1990 | Kyoto | Algebraic Geometry |
| Saper | Leslie | 1990 | Kyoto | Algebraic Geometry |
| Sarnak | Peter C. | 1990 | Kyoto | Number Theory |
| Schapira | Pierre | 1990 | Kyoto | Partial Differential Equations |
| Schwarz | Albert | 1990 | Kyoto | Mathematical Physics |
| Segal | Graeme | 1990 | Kyoto | Mathematical Physics |
| Shioda | Tetsuji | 1990 | Kyoto | Number Theory |
| Shustin | Eugenii I. | 1990 | Kyoto | Geometry |
| Sibony | Nessim | 1990 | Kyoto | Real & Complex Analysis |
| Sigal | I. M. | 1990 | Kyoto | Mathematical Physics |
| Simpson | Carlos T. | 1990 | Kyoto | Algebraic Geometry |
| Sinai | Yakov G. | 1990 | Kyoto | Plenary |
| Skandalis | George | 1990 | Kyoto | Operator Algebras & Functional Analysis |
| Slaman | Theodore A. | 1990 | Kyoto | Mathematical Logic & Foundations |
| Steel | John R. | 1990 | Kyoto | Mathematical Logic & Foundations |
| Steenbrink | Joseph H. M. | 1990 | Kyoto | Geometry |
| Struwe | Michael | 1990 | Kyoto | Partial Differential Equations |
| Sunada | Toshikazu | 1990 | Kyoto | Geometry |
| Takasaki | Kanehisa | 1990 | Kyoto | Partial Differential Equations |