Mary Caswell Orr (1910 –2006) was an American actress and short story author whose "The Wisdom of Eve," written in 1946, was the basis of the Academy Award-winning film All About Eve. In 1964, she and her husband, director-playwright Reginald Denham, adapted The Wisdom of Eve into a play (of the same name), which was produced off-Broadway in 1979. In 1970, a hit Broadway musical, Applause, was based on All About Eve and gave a credit to Mary Orr for the original story. The musical, which starred Lauren Bacall and Penny Fuller, was broadcast on CBS in 1973.
