The Smog (also known as Wes Craven's The Smog) is a 1989 American horror thriller film directed by Wes Craven, who also co-wrote the screenplay and created the music for the film. It stars Debbie Rochon, Heathet Lagenkamp, Tiffany Shepis, Tom Welling, and Kenneth Welsh. It tells the story of a strange, glowing smog that sweeps in over a small coastal town in Chicago, bringing it with the vengeful ghosts of murderers who were arrested and executed there exactly 700 years before.

The Smog was Craven's first theatrical film after the sucess of his 1984 horror film A Nightmare on Elm Street, which also starred Heather Lagenkamp. A sequel to the film was made in 2006.