Seymour Benzer (October 15, 1921 – November 30, 2007) was an American physicist, biologist and geneticist. He was of Jewish descent.
His career began during the molecular biology revolution of the 1950s, and he eventually rose to prominence in the fields of molecular and behavioral genetics. He led a genetics research lab at Purdue University and at the California Institute of Technology.
Benzer made fundamental discoveries in two quite different fields of genetics. He got his PhD in solid-state physics, but soon switched to genetics after he read Erwin Schrödinger's book What is Life?