Dirk Bogarde as Max

Charlotte Rampling as Lucia

Philippe Leroy as Klaus

Gabriele Ferzetti as Hans

Giuseppe Addobbati as Stumm

Isa Miranda as Countess Stein

Nino Bignamini as Adolph

Marino Masé as Atherton

Amadeo Amodio as Bert

Piero Vida as Day Porter

Geoffrey Copleston as Kurt

Manfred Freyberger as Dobson

Ugo Cardea as Mario

Hilda Gunther as Greta

Nora Ricci as The Neighbor

Piero Mazzinghi as Concierge

Kai-Siegfried Seefeld as Jacob

Luigi Antonio Guerra as Bit role (uncredited)

Carlo Mangano as Porter (uncredited)

Anthony Forwood as Opera Audience (uncredited)