Susan Strasberg
— Martha
Nathalie Delon
— Diana
Massimo Girotti
— Alex
Giancarlo Giannini
— Dario
Lars Bloch
— Martha's Lover
Franco Abbiana
— Party Guest
Gianni Pulone
— Party Guest
Attilio Dottesio
— Party Guest
Rossana Canghiari
— Train Passenger (uncredited)
Alfonso Giganti
— Diana's Driver (uncredited)
Filippo Perego
— Party Guest (uncredited)