The 2021 BYU Cougars football team represented Brigham Young University in the 2021 NCAA Division I FBS football season. The Cougars were led by sixth-year head coach Kalani Sitake and played their home games at LaVell Edwards Stadium. This was the eleventh year BYU competed as an NCAA Division I FBS independent. The Cougars finished with 10 wins for the second year in a row.