John Brahm was a German film and television director. His films include The Undying Monster (1942), The Lodger (1944), Hangover Square (1945), The Locket (1946), The Brasher Doubloon (1947), and the 3D horror film, The Mad Magician (1954).

Hangover Square is a 1945 American film noir directed by John Brahm, based on the 1941 novel Hangover Square by Patrick Hamilton. The screenplay was written by Barré Lyndon, who made a number of changes to the novel, including transforming George Harvey Bone into a classical composer-pianist and filming the story as a turn-of-the-20th-century period piece.