| Year: | 1998 |
| Team: | Appalachian State Mountaineers |
| Sport: | football |
| Conference: | Southern Conference |
| Short Conf: | SoCon |
| Tsnrank: | 6 |
| Record: | 10–3 |
| Conf Record: | 6–2 |
| Head Coach: | Jerry Moore |
| Hc Year: | 10th |
| Stadium: | Kidd Brewer Stadium |
| Bowl: | NCAA Division I-AA Quarterfinal |
| Bowl Result: | L 20–31 vs. Northwestern State |
The 1998 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 1998 NCAA Division I-AA football season. In their tenth year under head coach Jerry Moore, the Mountaineers compiled an overall record of 10–3, with a conference mark of 6–2. Appalachian State advanced to the NCAA Division I-AA Football Championship playoffs, where they defeated Tennessee State in the first round and lost to Northwestern State in the quarterfinals.