The 2021 UCF Knights football team represented the University of Central Florida (UCF) during the 2021 NCAA Division I FBS football season. The Knights were led by first-year head coach Gus Malzahn and played their home games at Bounce House in Orlando, Florida. They competed as members of the American Athletic Conference.

Arthur Gustavo Malzahn III is an American football coach. He is currently the head coach at the University of Central Florida (UCF). He was the head football coach at Auburn University from 2013 to 2020. He helped lead the 2010 Auburn Tigers to a National Championship as the team's offensive coordinator. As head coach at Auburn, he led the team to a SEC Championship win and an appearance in the 2014 National Championship. Malzahn has coached Heisman winner Cam Newton and two Heisman finalists: Nick Marshall and Tre Mason, including coaching 14 All-Americans. During Malzahn's tenure at Auburn, he qualified as the second-longest tenured head coach at one school in the SEC, behind Nick Saban. Out of active head coaches, Malzahn also holds the best record against coach Saban.