Why We Fight, directed by Eugene Jarecki, is a 2006 documentary film about the military–industrial complex. The title refers to the World War II-era eponymous propaganda movies commissioned by the U.S. Government to justify their decision to enter the war against the Axis Powers.

Why We Fight was first screened at the 2005 Sundance Film Festival on 17 January 2005, exactly forty-four years after President Dwight D. Eisenhower's farewell address. It won the Grand Jury Prize for Documentary, however, it received a limited public cinema release on 22 January 2006, and then was released on DVD on 27 June 2006, by Sony Pictures Home Entertainment. The documentary also won one of the 2006 Grimme Awards in the competition "Information & Culture"; the prize is one of Germany's most prestigious for TV productions.