They Won't Forget is a 1937 American drama film directed by Mervyn LeRoy and starring Claude Rains, Gloria Dickson, Edward Norris, and Lana Turner, in her feature debut. It was based on a novel by Ward Greene called Death in the Deep South, which was in turn a fictionalized account of a real-life case: the trial and subsequent lynching of Leo Frank after the murder of Mary Phagan in 1913.

Mervyn LeRoy was an American film director, producer and actor. In his youth he played juvenile roles in vaudeville and silent film comedies.