| Last Name | First Name | Year | City | Section/Speaker Type Sort descending |
|---|---|---|---|---|
| Nicoladzé | G. | 1928 | Bologna | Geometry |
| Oh | Yong-Geun | 2006 | Madrid | Geometry |
| Osserman | R. | 1978 | Helsinki | Geometry |
| Pacard | Frank | 2010 | Hyderabad | Geometry |
| Padoa | A. | 1900 | Paris | Geometry |
| Palozzii | G. | 1928 | Bologna | Geometry |
| Pannelli | M. | 1908 | Rome | Geometry |
| Perelman | G. | 1994 | Zurich | Geometry |
| 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 |