Through the childhood and adolescence of Signor Giacomo Casanova (from his memoirs), this is a description of how people lived in 18th-century Venice: their customs, habits, medicine, religion, and--most of all--the omnipresence of hypocrisy.

Leonard Whiting
as Giacomo Casanova

Maria Grazia Buccella
as Zanetta

Lionel Stander
as Don Tosello

Raoul Grassilli
as Don Gozzi

Wilfrid Brambell
as Malipieri

Tina Aumont
as Marcella

Senta Berger
as Giulietta Cavamacchia

Mario Scaccia
as Dottor Zambelli

Claudio De Kunert
as Giacomo Casanova bambino

Silvia Dionisio
as Mariolina