Sarah Elizabeth Selby (August 30, 1905 – January 7, 1980) was an American actress. She starred in numerous films from 1941 to 1978. In her first role, she voiced the elephant Prissy in the movie Dumbo. Selby was an actress, known for Tower of London (1962), Beyond the Forest (1949) and a recurring role as Aunt Gertrude in The Mickey Mouse Club television series The Hardy Boys: The Mystery of the Applegate Treasure (1956). Among her radio program appearances, she played various roles on 1947 Escape drama anthology series, and was a regular cast member as Grace in the 1948-50 Junior Miss radio sitcom.