Lost Boundaries is a 1949 American film directed by Alfred L. Werker that stars Beatrice Pearson, Mel Ferrer (in his first starring role), and Susan Douglas Rubeš. The film is based on William Lindsay White's story of the same title, a nonfiction 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. The use of white actors in the film's leading Black roles proved controversial. The film was banned in Atlanta, Georgia, and Memphis, Tennessee.