Audrey Hepburn

Character: Sister Luke

Peter Finch

Character: Dr. Fortunati

Edith Evans

Character: Rev. Mother Emmanuel

Peggy Ashcroft

Character: Mother Mathilde

Dean Jagger

Character: Dr. Hubert Van Der Mal

Mildred Dunnock

Character: Sister Margharita

Beatrice Straight

Character: Mother Christophe

Patricia Collinge

Character: Sister William

Rosalie Crutchley

Character: Sister Eleanor

Ruth White

Character: Mother Marcella

Barbara O'Neil

Character: Mother Didyma

Margaret Phillips

Character: Sister Pauline

Patricia Bosworth

Character: Simone

Colleen Dewhurst

Character: Dangerous Hospital Patient

Stephen Murray

Character: Chaplain

Lionel Jeffries

Character: Dr. Goovaerts

Niall MacGinnis

Character: Father Vermeuhlen

Eva Kotthaus

Character: Sister Marie

Molly Urquhart

Character: Sister Augustine

Dorothy Alison

Character: Sister Aurelie

Jeanette Sterke

Character: Louise

Errol John

Character: Illunga

Diana Lambert

Character: Lisa

Orlando Martins

Character: Kalulu

Penelope Horner

Character: Jeanette Milonet (uncredited)

Charles Lamb

Character: Pascin (uncredited)

Ave Ninchi

Character: Sister Bernard (uncredited)

Richard O'Sullivan

Character: Pierre (uncredited)

Frank Singuineau

Character: Murderer of Sister Aurelie (uncredited)

Elsa Albani

Character: (uncredited)

Gabriella Andreini

Character: (uncredited)

Juan Aymerich

Character: (uncredited)

Grazia De Rossi

Character: (uncredited)

Giovanna Galletti

Character: (uncredited)