Hasenfratz or Hassenfratz is a surname.
Notable people with the surname include: Anna Hasenfratz, Hungarian-American physicist, sister of Péter Frank Hasenfratz (1935–2022), Hungarian-born Canadian billionaire businessman Hans-Peter Hasenfratz (1938–2016), Swiss religious scholar Jean Henri Hassenfratz (born 1755), French chemist, physics professor, mine inspector, and participant in the French Revolution Linda Hasenfratz (born 1966), Canadian businesswoman Mike Hasenfratz (1966–2024), Canadian hockey referee (1946–2016), Hungarian-Swiss physicist, brother of Anna