The 2020 Appalachian State Mountaineers football team represented Appalachian State University during the 2020 NCAA Division I FBS football season. The Mountaineers were led by first-year head coach Shawn Clark. Appalachian State played their 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.
Appalachian State had games scheduled against Morgan State, UMass, Wake Forest and Wisconsin, which were canceled due to the COVID-19 pandemic.