Karl Tunberg (Spokane, Washington, 1909 – March 11 London, 3 April 1992) was a writer and occasional film producer.

He started writing screenplays, usually together with other writers at the end of the 1930s. His first feature film was You Can’t Have Everything (1937), after which could write for different comedies and musicals with stars such as Betty Grable, Deanna Durbin, Dorothy Lamour, Sonja Henie, Shirley Temple. Among his works are My Gal Sal (1942), Standing Room Only (1944), Kitty (1945), all of them with Paulette Goddard, Because You re Mine (1952), Valley of the Kings (1954), Beau Brummell (1954), The Seventh Sin (1957), Count Your Blessings (1959) and Libel (1959).

He became known by Ben-Hur which figured as a screenwriter, in spite of the fact that the director, William Wyler, had chosen other writers such as Maxwell Anderson, Christopher Fry and Gore Vidal.