| Last Name | First Name | Year | City | Section/Speaker Type Sort ascending |
|---|---|---|---|---|
| Petrovitch | M. | 1928 | Bologna | Geometry |
| Pfeiffer | G.F. | 1908 | Rome | Geometry |
| Pontrjagin | L. | 1932 | Zurich | Geometry |
| Rados | G. | 1908 | Rome | Geometry |
| Reidemeister | K. | 1928 | Bologna | Geometry |
| Reye | Th. | 1897 | Zurich | Geometry |
| Ricci | G. | 1924 | Toronto | Geometry |
| Ricci | Giovanni | 1932 | Zurich | Geometry |
| Ringström | Hans | 2014 | Seoul | Geometry |
| Rogers | C. A. | 1974 | Vancouver | Geometry |
| Rohn | K. | 1904 | Heidelberg | Geometry |
| Ros | Antonio | 2006 | Madrid | Geometry |
| Rosati | C. | 1928 | Bologna | Geometry |
| Rosenblatt | A. | 1928 | Bologna | Geometry |
| Rowe | C. H. | 1932 | Zurich | Geometry |
| Ruh | E. A. | 1986 | Berkeley | Geometry |
| Ryshkov | S. S. | 1974 | Vancouver | Geometry |
| Sagastume | A. | 1928 | Bologna | Geometry |
| Salamon | Dietmar | 1994 | Zurich | Geometry |
| Sannia | G. | 1928 | Bologna | Geometry |
| Schaake | G. | 1928 | Bologna | Geometry |
| Scheffers | G. | 1904 | Heidelberg | Geometry |
| Schoen | R. M. | 1983 | Warszawa | Geometry |
| Schönflies | A. | 1904 | Heidelberg | Geometry |
| Schoute | P.H. | 1912 | Cambridge | Geometry |