| Guy Hirsch | |
| Birth Date: | 20 September 1915 |
| Birth Place: | London |
| Death Place: | Brussels |
| Field: | Mathematics |
| Work Institutions: | Université libre de Bruxelles |
| Alma Mater: | Université libre de Bruxelles |
| Doctoral Advisor: | Alfred Errera |
| Known For: | algebraic topology |
Guy Hirsch (20 September 1915 – 4 August 1993)[1] was a Belgian mathematician and philosopher of mathematics, who worked on algebraic topology and epistemology of mathematics.
He became a member of the Royal Flemish Academy of Belgium for Science and the Arts in 1973.
He is known for the Leray–Hirsch theorem, a basic result on the algebraic topology of fiber bundles that he proved independently of Jean Leray in the late 1940s.