The 2004 NCAA Division I-A football season was the highest level of college football competition in the United States organized by the National Collegiate Athletic Association (NCAA). The regular season began on August 28, 2004 and ended on December 4, 2004. The postseason concluded on January 4, 2005 with the Orange Bowl, which served as the season's BCS National Championship Game.

The 2004 USC Trojans football team represented the University of Southern California in the 2004 NCAA Division I-A football season. The 2004 Trojans football team won the 2004 BCS National Championship by winning the 2005 Orange Bowl, that year's BCS National Championship Game. The team also won the AP title for the second year in a row. It was the Trojans' first unanimous national championship since 1972, and the second time a team had gone wire-to-wire, with the Trojans holding the number 1 spot in the polls all season. The team was coached by Pete Carroll in his fourth year with the Trojans, and played their home games in the Los Angeles Memorial Coliseum. The team is widely considered one of the greatest college football teams of all time.