I.O.U.S.A. is a 2008 American documentary film directed by Patrick Creadon. The film focuses on the shape and impact of the United States national debt. The film features Robert Bixby, director of the Concord Coalition, and David Walker, the former U.S. Comptroller General, as they travel around the United States on a tour to let communities know of the potential dangers of the national debt. The tour was carried out through the Concord Coalition, and was known as the "Fiscal Wake-Up Tour."

The film competed in the Documentary Competition at the 2008 Sundance Film Festival. It began its nationwide showing at the Holland Performing Arts Center in Omaha, Nebraska on 21 August 2008, with a live discussion among Warren Buffett, Pete Peterson, David Walker, William Niskanen, and Bill Novelli following the screening. The film was broadcast on CNN on January 10, 2009.