Audrey Hepburn

Sister Luke

Peter Finch

Dr. Fortunati

Edith Evans

Rev. Mother Emmanuel

Peggy Ashcroft

Mother Mathilde

Dean Jagger

Dr. Hubert Van Der Mal

Mildred Dunnock

Sister Margharita

Beatrice Straight

Mother Christophe

Patricia Collinge

Sister William

Rosalie Crutchley

Sister Eleanor

Ruth White

Mother Marcella

Barbara O'Neil

Mother Didyma

Margaret Phillips

Sister Pauline

Patricia Bosworth

Simone

Colleen Dewhurst

Dangerous Hospital Patient

Stephen Murray

Chaplain

Lionel Jeffries

Dr. Goovaerts

Niall MacGinnis

Father Vermeuhlen

Eva Kotthaus

Sister Marie

Molly Urquhart

Sister Augustine

Dorothy Alison

Sister Aurelie

Jeanette Sterke

Louise

Errol John

Illunga

Diana Lambert

Lisa

Orlando Martins

Kalulu

Penelope Horner

Jeanette Milonet (uncredited)

Charles Lamb

Pascin (uncredited)

Ave Ninchi

Sister Bernard (uncredited)

Richard O'Sullivan

Pierre (uncredited)

Frank Singuineau

Murderer of Sister Aurelie (uncredited)

Elsa Albani

(uncredited)

Gabriella Andreini

(uncredited)

Juan Aymerich

(uncredited)

Grazia De Rossi

(uncredited)

Giovanna Galletti

(uncredited)