The Fog is a 1980 American independent supernatural horror film directed by John Carpenter, who also co-wrote the screenplay and created the music for the film. It stars Adrienne Barbeau, Jamie Lee Curtis, Tom Atkins, Janet Leigh and Hal Holbrook. It tells the story of a strange, glowing fog that sweeps over a small coastal town in Northern California.

Filmed in the spring of 1979, The Fog was scheduled to be released at Christmas that year by AVCO Embassy Pictures, but its release date was delayed to February 1, 1980. The film divided critics upon release, receiving praise for its visuals and acting, and criticism for its structure and screenplay. Despite mixed reviews, the film grossed $21.3 million domestically.

The Fog contains themes of revenge and repressed corrupt historical events resurfacing in contemporary small-town America. In the years since its original release, it has established a cult following. A remake was released in 2005.