Bully (originally titled The Bully Project) is a 2011 American documentary film directed by Lee Hirsch and produced by Hirsch and Cynthia Lowen. It documents the lives of five students who face bullying on a daily basis in U.S. schools. The film premiered at the Tribeca Film Festival on April 23, 2011.

On the film's official website, the filmmakers promoted Bully as a tool to help combat bullying and facilitate an anti-bullying movement, but these goals were jeopardized by its initial R rating from the Motion Picture Association of America. Following a failed appeal of the rating, the Weinstein Company released the film unrated in theaters in the United States on March 30, 2012. After some profanity was removed, the film was re-rated PG-13, and this version of the film was released in theaters on April 13. The PG-13 version of the film was released on Blu-ray and DVD nearly a year later, on February 12, 2013.