Ehrenfest is a surname. Notable people with the surname include:
Paul Ehrenfest, Austrian physicist and mathematician
Ehrenfest equations
Ehrenfest model
Ehrenfest paradox
Ehrenfest theorem
32796 Ehrenfest
Tatjana Ehrenfest-Afanassjewa, Ukrainian-Russian mathematician, wife of Paul
Tanja van Aardenne-Ehrenfest (1905–1984), Austrian Dutch mathematician, daughter of Paul