The Believer is a 2001 American drama film written and directed by Henry Bean in his feature directorial debut, based on a story by Bean and Mark Jacobson. Starring Ryan Gosling, Billy Zane, Theresa Russell, and Summer Phoenix, the film follows Daniel Balint, a Jew who becomes a neo-Nazi. The film is loosely based on the true story of Dan Burros, a member of the American Nazi Party and the New York branch of the United Klans of America who died by suicide after being revealed as Jewish by a reporter from The New York Times.

The Believer premiered at the Sundance Film Festival on January 19, 2001, where it won the Grand Jury Prize. It was theatrically released in the United States on May 17, 2002, to positive reviews, with particular praise for Gosling's performance. The film earned several accolades, including the Golden St. George at the 23rd Moscow International Film Festival. It received four nominations at the 17th Independent Spirit Awards, Best First Feature and Best Screenplay for Bean, Best Male Lead for Gosling, and Best Supporting Female for Summer Phoenix.