One Dark Night (also known as Entity Force) is a 1982 American supernatural horror film directed by Tom McLoughlin, and starring Meg Tilly, E. G. Daily, and Adam West. It follows three teenagers sent to a mausoleum for the night as part of a high school initiation rite. A telekinetic occultist returns from the dead and haunts them, forcing the three to survive the night inside the crypt.

The film was conceived and filmed under the title Rest in Peace before Poltergeist. It was given a limited platform release in the United States on July 9, 1982, before receiving wide distribution by Comworld Pictures in January 1983.