The Fog of War: Eleven Lessons from the Life of Robert S. McNamara is a 2003 American documentary film about the life and times of former U.S. Secretary of Defense Robert S. McNamara illustrating his observations of the nature of modern warfare. The film was directed by Errol Morris and features an original score by Philip Glass. The title derives from the military concept of the "fog of war" depicting the difficulty of making decisions in the midst of conflict.
The film won the 2003 Academy Award for Best Documentary Feature and Independent Spirit Award for Best Documentary Feature. It was non-competitively screened at the Cannes Film Festival.