The 2021 Appalachian State Mountaineers football team represented Appalachian State University during the 2021 NCAA Division I FBS football season. The Mountaineers were led by second-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.
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<small>Listed in the order that they were released</small>
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The Sun Belt coaches poll was released on July 20, 2021. The Mountaineers were picked to finish tied for first in the East Division and third overall in the conference.
Offense
1st team
2nd team
Defense
1st team
2nd team
The 2021 schedule had 6 home, 5 away, and one neutral game in the regular season. The Mountaineers traveled to Sun Belt foes Georgia State, Louisiana, Arkansas State, and Troy. The Mountaineers hosted Sun Belt foes Coastal Carolina, LouisianaâÂÂMonroe, South Alabama, and Georgia Southern.
Appalachian State hosted two of the four non-conference opponents at Kidd Brewer Stadium, Elon, from NCAA Division I FCS and Marshall of the Conference USA, traveled to Miami (FL) of the ACC, and played a neutral site game against East Carolina of The American at Bank of America Stadium.