| Year: | 1999 |
| Team: | Appalachian State Mountaineers |
| Sport: | football |
| Conference: | Southern Conference |
| Short Conf: | SoCon |
| Tsnrank: | 9 |
| Record: | 9–3 |
| Conf Record: | 7–1 |
| Head Coach: | Jerry Moore |
| Hc Year: | 11th |
| Stadium: | Kidd Brewer Stadium |
| Champion: | SoCon co-champion |
| Bowl: | NCAA Division I-AA First Round |
| Bowl Result: | L 29–44 vs. |
The 1999 Appalachian State Mountaineers football team was an American football team that represented Appalachian State University as a member of the Southern Conference (SoCon) during the 1999 NCAA Division I-AA football season. In their 11th year under head coach Jerry Moore, the Mountaineers compiled an overall record of 9–3, with a conference mark of 7–1, and finished as SoCon co-champion. Appalachian State advanced to the NCAA Division I-AA Football Championship playoffs, where they were upset by in the first round.