Bully 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.

Bullying is the use of force, coercion, hurtful teasing or threat, to abuse, aggressively dominate or intimidate. The behavior is often repeated and habitual. One essential prerequisite is the perception of an imbalance of physical or social power. This imbalance distinguishes bullying from conflict. Bullying is a subcategory of aggressive behavior characterized by hostile intent, imbalance of power and repetition over a period of time.