Detour is a 1945 American independent film noir directed by Edgar G. Ulmer starring Tom Neal and Ann Savage. The screenplay was adapted by Martin Goldsmith and Martin Mooney (uncredited) from Goldsmith's 1939 novel of the same title, and released by the Producers Releasing Corporation, one of the so-called Poverty Row film studios in mid-20th-century Hollywood. The film, which today is in the public domain and freely available for viewing at various online sources, was restored by the Academy Film Archive in 2018. In April that year, the 4K restoration premiered in Los Angeles at the TCM Festival. A Blu-Ray and DVD was released in March 2019 from the Criterion Collection. In 1992, Detour was selected for the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant".

Edgar Georg Ulmer was a Jewish-Moravian, Austrian-American film director who mainly worked on Hollywood B movies and other low-budget productions, eventually earning the epithet 'The King of PRC', due to his extremely prolific output for the Poverty Row studio. His stylish and eccentric works came to be appreciated by auteur theory-espousing film critics in the years following his retirement. Ulmer's most famous productions include the horror film The Black Cat (1934) and the film noir Detour (1945).