The Glass Key is a 1942 American film noir based on the 1931 novel of the same name by Dashiell Hammett. The picture was directed by Stuart Heisler starring Brian Donlevy, Veronica Lake and Alan Ladd. A successful earlier film version starring George Raft in Ladd's role had been released in 1935. The 1942 version's supporting cast features William Bendix, Bonita Granville, Richard Denning and Joseph Calleia.

The Glass Key is a novel by American writer Dashiell Hammett. First published as a serial in Black Mask magazine in 1930, it then was collected in 1931. It tells the story of a gambler and racketeer, Ned Beaumont, whose devotion to Paul Madvig, a crooked political boss, leads him to investigate the murder of a local senator's son as a potential gang war brews. Hammett dedicated the novel to his onetime lover Nell Martin.