Guess Who's Coming to Dinner is a 1967 American romantic comedy-drama film produced and directed by Stanley Kramer, and written by William Rose. It stars Spencer Tracy (in his final role), Sidney Poitier, and Katharine Hepburn, and features Hepburn's niece Katharine Houghton. In 2017 (on its 50th anniversary), the film was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant". The film's Oscar-nominated score was composed by Frank De Vol.