2021 Mary Hardin–Baylor Crusaders football team

The 2021 Mary Hardin–Baylor Crusaders football represented the University of Mary Hardin–Baylor as a member of the American Southwest Conference during the 2021 NCAA Division III football season. Led by 23rd-year head coach Pete Fredenburg, the Crusaders compiled an overall record of 15–0 with a mark of 9–0 in conference play, winning the ASC title.

Mary Hardin–Baylor beat in the first round,  in the second round,  in the quarterfinals, and  in the semifinals before playing in the 2021 Stagg Bowl where they played  and won 57–24 to secure the school's second-overall and first-non vacated title. Mary Hardin–Baylor played home games at Crusader Stadium in Belton, Texas.