Montgomery Clift as Sigmund Freud

Susannah York as Cecily Koertner

Larry Parks as Dr. Joseph Breuer

Susan Kohner as Martha Freud

Eileen Herlie as Frau Ida Koertner

Fernand Ledoux as Dr. Charcot

David McCallum as Carl von Schlossen

Rosalie Crutchley as Frau Amalia Freud

David Kossoff as Jacob Freud

Joseph Fürst as Herr Jacob Koertner

Alexander Mango as Babinsky

Leonard Sachs as Brouhardier

Eric Portman as Dr. Theodore Meynert

John Huston as Narrator (voice) (uncredited)

Ol Abdou as (uncredited)

Manfred Andrae as Student Doctor (uncredited)

Victor Beaumont as Dr. Guber (uncredited)

Allan Cuthbertson as Wilkie (uncredited)

Eduard Linkers as Dr. Torsch (uncredited)

Ferdy Mayne as Questioner at Final Lecture (uncredited)

Elisabeth Neumann-Viertel as Frau Bernays (uncredited)

Maria Perschy as Magda (uncredited)

Moira Redmond as Nora Wimmer (uncredited)

Charles Regnier as (uncredited)

Stefan Schnabel as Chairman of Medical Profession in Vienna (uncredited)