The 2004 NCAA Division I-AA football season, part of college football in the United States organized by the National Collegiate Athletic Association at the Division I-AA level, began on August 28, 2004, and concluded with the 2004 NCAA Division I-AA Football Championship Game on December 17, 2004, at Finley Stadium in Chattanooga, Tennessee. James Madison won their first I-AA championship, defeating Montana by a final score of 31−21.

• Prior to the season, the Great West Conference was formed as a football-only conference for six unaffiliated teams from California, Colorado, North Dakota, South Dakota, and Utah. A seventh prospective member, St. Mary's (CA), dropped their football program before the start of the season.

• September 4 – Florida Atlantic 35, Hawaii 28 ^OT
• September 11 – Florida Atlantic 20, North Texas 13
• September 11 – New Hampshire 35, Rutgers 24
• September 18 – Florida Atlantic 27, Middle Tennessee 20
• September 18 – Maine 9, Mississippi State 7
• September 25 – Eastern Illinois 31, Eastern Michigan 28