Katharine Houghton is an American actress and playwright. She portrayed Joanna "Joey" Drayton, a white woman who brings home her black fiancé to meet her parents, in the 1967 film Guess Who's Coming to Dinner. Katharine Hepburn, who played the mother of Houghton's character in the film, was Houghton's aunt. She is also known for her role as Kanna, Katara and Sokka's grandmother in the film The Last Airbender (2010).

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, Sidney Poitier, and Katharine Hepburn, and features Hepburn's niece Katharine Houghton.