Arn: The Knight Templar (Swedish: Arn: Tempelriddaren) is an epic film based on Jan Guillou's trilogy about the fictional Swedish Knight Templar Arn Magnusson. The film was released to cinemas in Sweden on 17 December 2007 and the sequel, Arn – The Kingdom at Road's End (Arn – Riket vid vägens slut), was released 22 August 2008, but both films were combined into a single cut for the English release on DVD in 2010. While the film is mostly in Swedish and most of the production was made in Sweden, the film is a joint production between Sweden, Denmark, Norway, Finland and Germany. With a total budget of around SEK 210 million (ca. US $30 million) for both films, it is the most expensive production in Swedish cinema. The film grossed $22.5 million according to Box Office Mojo.

The original movie follows the first two volumes of Guillou's trilogy. An "international" version has been created which incorporates this film and its sequel Arn – The Kingdom at Road's End into a single cut with a duration of approximately 130 minutes.