Alone in the Dark is a 2005 action horror film directed by Uwe Boll and written by Elan Mastai, Michael Roesch, and Peter Scheerer. Based on the video game series of the same name, it stars Christian Slater, Tara Reid, and Stephen Dorff as paranormal investigators who combat a supernatural threat. The film's story is a loose adaptation of the game Alone in the Dark: The New Nightmare (2001).

Upon release, the film was panned by critics for the story, dialogue, special effects, and Reid's performance. Holding a 1% approval rating on Rotten Tomatoes, Alone in the Dark is considered one of the worst films ever made. It was also a box-office bomb, grossing $12.7 million on a $20 million budget, although the home media releases were more successful. A sequel with a different cast and story was released to home media in 2008; Boll served as a producer.