| Semyon Alesker | |
| Native Name: | סמיון אלסקר |
| Native Name Lang: | he |
| Nationality: | Israeli, Russian |
| Fields: | Mathematics |
| Alma Mater: | Tel Aviv University |
| Doctoral Advisor: | Vitali Milman |
| Awards: | EMS Prize (2000) Erdős Prize (2004) |
Semyon Alesker (Hebrew: סמיון אלסקר; born 1972) is an Israeli mathematician at Tel Aviv University. For his contributions in convex geometry and integral geometry, in particular his work on valuations, he won the EMS Prize in 2000,[1] and the Erdős Prize in 2004.