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)