Lost Boundaries (1949) is an American film directed by Alfred L. Werker that stars Beatrice Pearson, Mel Ferrer (in his first starring role), and Susan Douglas Rubes. The film is based on William Lindsay White's book of the same, a non-fiction account of Dr. Albert C. Johnston and his family who passed for white while living in New England in the 1930s and 1940s. The film won the 1949 Cannes Film Festival award for Best Screenplay.