Mary Caswell Orr (December 21, 1910 – September 22, 2006) was an
American actress and author whose
short story "The Wisdom of Eve", published in the May 1946 issue of
Cosmopolitan, was the basis of the
Academy Award-winning film
All About Eve (1950). In private life, Orr used her married name,
Mary Orr Denham.