| Year: | 2003 |
| Team: | Appalachian State Mountaineers |
| Sport: | football |
| Conference: | Southern Conference |
| Short Conf: | SoCon |
| Record: | 7–4 |
| Conf Record: | 6–2 |
| Head Coach: | Jerry Moore |
| Hc Year: | 15th |
| Stadium: | Kidd Brewer Stadium |
The 2003 Appalachian State Mountaineers football team represented Appalachian State University as a member of the Southern Conference (SoCON) in the 2003 NCAA Division I-AA football season. Led by 15th-year head coach Jerry Moore, the Mountaineers compiled an overall record of 7–4 with a mark of 6–2 in conference play, placing second in the SoCon.[1] The team finished the season with a 26–18 victory over rival Western Carolina in the Battle for the Old Mountain Jug. Home games were played at Kidd Brewer Stadium in Boone, North Carolina.