First performer to win Best Actress for playing a nun:

Susan Sarandon for Dead Man Walking (1995)
Even though nine women have been nominated for Best Actress or Supporting Actress for playing nuns [Dame Gladys Cooper, The Song of Bernadette (1943); Ingrid Bergman, The Bells of St. Mary's (1945); Loretta Young and Celeste Holm, Come to the Stable (1949); Deborah Kerr, Heaven Knows, Mr. Allison (1957); Audrey Hepburn, The Nun's Story (1959); Meg Tilly and Anne Bancroft, Agnes of God (1985); and Susan Sarandon, Dead Man Walking (1995)], only Miss Sarandon has taken home the Statuette for her performance.