The 2004 Appalachian State Mountaineers football team represented Appalachian State University in the college football season of 2004–2005. The Mountaineers compete in Division I-AA as a member of the Southern Conference. The team celebrated its 75th season of play and were led by Jerry Moore in his 16th season as head coach. Home games were played at Kidd Brewer Stadium in Boone, North Carolina. The 2004 season was a disappointing one for the Mountaineers. The team finished third in the Southern Conference at 4–3 and slumped to an overall 6–5 record. The low point of the season was a 30–27 loss to archrival Western Carolina in the Battle for the Old Mountain Jug.