Nightmare is a 1942 American film noir crime film directed by Tim Whelan and starring Diana Barrymore, Brian Donlevy and Henry Daniell. The film was based on a novel of the same name by Philip MacDonald.

This article needs an improved plot summary. (March 2016)

Leslie Stafford (Diana Barrymore) is a secretary who seeks the help of a home invader, Daniel Shane (Brian Donlevy), to dispose of the body of her murdered husband in wartime London.

• Diana Barrymore as Leslie Stafford a.k.a. Butch
• Brian Donlevy as Daniel Shane
• Henry Daniell as Capt. Stafford
• Eustace Wyatt as Angus - Innkeeper
• Arthur Shields as Sergeant
• Gavin Muir as J.B. Abbington
• Stanley Logan as Inspector Robbins
• Ian Wolfe as James - Abbington's Butler
• Hans Conried as Hans - Nazi Agent
• John Abbott as Karl a.k.a. Charles
• David Clyde as Jock
• Elspeth Dudgeon as Angus' Wife
• Harold De Becker as Jeff Hawkins - London Cabby
• Ivan F. Simpson as Arnold - Money Changer
• Keith Hitchcock as London Bobby
• Arthur Gould-Porter as Freddie
• Anita Sharp-Bolster as Mrs. McDonald - Housekeeper
• Lydia Bilbrook as Mrs. Bates
• Pax Walker as Gladys
• Bobbie Hale as Old Gaffer (as Bobby Hale)