Bernard Crettaz (29 May 1938 – 28 November 2022) was a Swiss sociologist and ethnologist.

After his secondary education in Sion, Crettaz earned a doctorate in sociology from the University of Geneva in 1979 with the thesis Nomades et sédentaires.

He first worked as an assistant at the university before becoming a teacher at the Institut d'études sociales and later a researcher at the Institut de médecine légale sur la prison de Saint-Antoine.

[1] In 1976, Crettaz became curator of the European Department of the Musée d'ethnographie de Genève, which contained the Collection Georges Amoudruz [fr].

[2] In 1982, the Pompes funèbres générales [fr] asked Crettaz and his wife to co-found the Société d'études thanatologiques de Suisse Romande, of which he served as founding president.