Fred Zinnemann Director Audrey Hepburn Sister Luke (Gabrielle van der Mal) Actor Peter Finch Dr. Fortunati Actor Edith Evans Rev. Mother Emmanuel (Belgium) Actor Peggy Ashcroft Mother Mathilde (Africa) Actor Dean Jagger Dr. Van Der Mal Actor Mildred Dunnock Sister Margharita (Mistress of Postulants) Actor Beatrice Straight Mother Christophe (Sanatorium) Actor Patricia Collinge Sister William (convent teacher) Actor Eva Kotthaus Sister Marie (Sanatorium) Actor Ruth White Mother Marcella (School of Medicine) Actor Niall MacGinnis Father Vermeuhlen (Leprosarium) Actor Patricia Bosworth Simone (postulant who changed her mind) Actor Barbara O'Neil Mother Didyma (War-time Hospital) Actor Lionel Jeffries Dr. Goovaerts (School of Tropical Medicine) Actor Rosalie Crutchley Sister Eleanor Actor Colleen Dewhurst Archangel Gabriel (Sanatorium) Actor Robert Anderson Writer Kathryn Hulme Writer Henry Blanke Producer Franz Waxman Original Music Franz Planer Cinematographer Walter Thompson Film Editing