Dirk Bogarde as Dr. Henry Laidlaw Longman

Mary Ure as Oonagh Longman

John Clements as Major Hall

Michael Bryant as Dr. Danny Tate

Wendy Craig as Annabella

Harold Goldblatt as Professor Sharpey

Geoffrey Keen as Calder

Terry Palmer as Norman

Norman Bird as Aubrey

Terence Alexander as Rowing Coach (uncredited)

Grace Arnold as Train Passenger (uncredited)

Timothy Beaton as Paul Longman (uncredited)

Elizabeth Counsell as Girl Student on Station (uncredited)

Roger Delgado as Dr. Jean Bonvoulois (uncredited)

Ian Dewar as Crowd Ringleader (uncredited)

Geoffrey Denton as Train Guard (uncredited)

Ashik Devello as 2nd Indian Student (uncredited)

Terence Edmond as 1st Student at Party (uncredited)

Christopher Ellis as Peers Longman (uncredited)

Edward Fox as Stewart (uncredited)

Imogen Hassall as Student (uncredited)

Robin Hawdon as Student (uncredited)

Georgina Moon as Persephone Longman (uncredited)

Edward Palmer as Porter (uncredited)

Philip Ray as Father (uncredited)

Renu Setna as 1st Indian Student (uncredited)

Anthony Singleton as Boy Student on Station (uncredited)

Teresa Van Hoorn as Penny Longman ( uncredited)

David Weston as Student at Party (uncredited)

Pauline Winter as Mother (uncredited)