| Year: | 1978 |
| Team: | Appalachian State Mountaineers |
| Sport: | football |
| Conference: | Southern Conference |
| Short Conf: | SoCon |
| Record: | 7–4 |
| Conf Record: | 4–2 |
| Head Coach: | Jim Brakefield |
| Hc Year: | 8th |
| Stadium: | Conrad Stadium |
The 1978 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 1978 NCAA Division I-A football season. In their eighth year under head coach Jim Brakefield, the Mountaineers compiled an overall record of 7–4 with a mark of 4–2 in conference play, and finished third in the SoCon.