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 as well as illustrating his observations of the nature of modern warfare. The film was directed by Errol Morris and the original score is by Philip Glass. The title is related to the military phrase "Fog of War", describing the difficulty of making decisions in the midst of conflict.
The film won the 2003 Academy Award for Best Documentary Feature and the Independent Spirit Award for Best Documentary Feature. It was non-competitively screened at the Cannes Film Festival.