Demons (Italian: Dèmoni) is a 1985 Italian horror film directed by Lamberto Bava, produced and co-written by Dario Argento, and starring Urbano Barberini and Natasha Hovey. The plot follows two female university students who, along with a number of random people, are given complimentary tickets to a mysterious movie screening, where they soon find themselves trapped in the theater with a horde of ravenous demons.

The story was originally planned to be part of a three-story horror anthology film written by Dardano Sacchetti, but Bava took interest in the story more than the others, so he and Sacchetti began developing it into a separate feature. Argento, beginning to be interested in producing films, would contribute to the screenplay with Franco Ferrini, who was brought in by Argento. Filming took place in Berlin and Rome in the summer of 1985. The film features an instrumental score composed by Claudio Simonetti, as well as a soundtrack that includes songs by Mötley Crüe, Accept and Billy Idol.

Distributed by Titanus, Demons received a theatrical release in Italy in October 1985. It was followed by a 1986 sequel, Demons 2, also directed by Bava and produced by Argento. A third Demons film was conceived, but was completely rewritten and released as The Church (1989), directed by Michele Soavi.