Lost Boundaries is a 1949 American film starring Beatrice Pearson, Mel Ferrer, and Susan Douglas Rubeš. Directed by Alfred L. Werker, it 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.

Melchor Gastón Ferrer was an American actor and filmmaker. He achieved prominence on Broadway before scoring notable film hits with Scaramouche, Lili, and Knights of the Round Table. He starred opposite his wife, actress Audrey Hepburn, in War and Peace and produced her film Wait Until Dark. He also acted extensively in European films and appeared in several cult hits, including The Antichrist (1974), The Suspicious Death of a Minor (1975), The Black Corsair (1976), and Nightmare City (1980).