| Year: | 2023 |
| Team: | Appalachian State Mountaineers |
| Sport: | football |
| Conference: | Sun Belt Conference |
| Short Conf: | Sun Belt |
| Division: | East Division |
| Record: | 9–5 |
| Conf Record: | 6–2 |
| Head Coach: | Shawn Clark |
| Hc Year: | 4th |
| Off Coach: | Frank Ponce |
| Oc Year: | 2nd |
| Off Scheme: | Pro tempo |
| Def Coach: | Scot Sloan |
| Dc Year: | 1st |
| Def Scheme: | 3–4 |
| Stadium: | Kidd Brewer Stadium |
| Champion: | Cure Bowl champion |
| Conf Champ: | Sun Belt Championship |
| Conf Champ Result: | L 23–49 at Troy |
| Bowl: | Cure Bowl |
| Bowl Result: | W 13–9 vs. Miami (OH) |
The 2023 Appalachian State Mountaineers football team represented Appalachian State University during the 2023 NCAA Division I FBS football season. The Mountaineers were led by fourth-year head coach Shawn Clark. Appalachian State played home games at Kidd Brewer Stadium on the school's Boone, North Carolina, campus, and competed as a member of the East Division of the Sun Belt Conference.
On November 28, 2022, defensive coordinator Dale Jones left the program.[1]
On January 13, 2023, the Mountaineers hired Scot Sloan to be their defensive coordinator.[2]
On January 16 Appalachian State hired Frank Ponce to be their offensive coordinator after 2022 offensive coordinator Kevin Barbay left to become the offensive coordinator at Mississippi State.[3]
In the Sun Belt preseason coaches' poll, the Mountaineers were picked to finish in second place in the East division.[4]
| Media poll (East division) | |||
| 1 | James Madison | 78 (4) | |
| 2 | Appalachian State | 75 (4) | |
| 3 | Coastal Carolina | 71 (1) | |
| 4 | Marshall | 68 (1) | |
| 5 | Georgia Southern | 52 (1) | |
| 6 | Georgia State | 31 | |
| 7 | Old Dominion | 17 | |
The football schedule was announced on February 24, 2023.[5]