thumb|link=Witness for the Prosecution is a 1957 American courtroom drama film based on a short story (and later play) by Agatha Christie dealing with the trial of a man accused of murder. The first film adaptation of this story, it stars Tyrone Power (in his final screen role), Marlene Dietrich, and Charles Laughton, and features Elsa Lanchester. The film was adapted by Larry Marcus, Harry Kurnitz and the film's director Billy Wilder.