31 is a 2016 American horror film written, directed, and produced by Rob Zombie, and starring an ensemble cast featuring Sheri Moon Zombie, Jeff Daniel Phillips, Lawrence Hilton-Jacobs, Meg Foster, Richard Brake, Jane Carr, Judy Geeson, E.G. Daily, and Malcolm McDowell.

A period piece set in 1976, the film is about five carnies, who are kidnapped by a gang of homicidal clowns called "The Heads". The carnies are forced to play a survival game called "31", where they are chased by the clowns through a maze of rooms over 12 hours. The penalty for capture being torture and murder, while bets are placed on their progress.

The film was crowdfunded online twice at fanbacked.com. At a test screening, Zombie compared 31 to his 2005 film The Devil's Rejects. It received mixed reviews, with multiple critics deeming it unoriginal.