The 2021 Allen Crowe 100 was the 15th stock car race of the 2021 ARCA Menards Series season, and the 39th iteration of the event. The race was held on Sunday, August 22, in Springfield, Illinois at the Illinois State Fairgrounds Racetrack, a 1 mile (1.6 km) permanent clay oval-shaped track at the Illinois State Fair. The race took the scheduled 100 laps to complete. At race's end, Corey Heim of Venturini Motorsports would dominate the race to win his seventh career ARCA Menards Series win and the sixth of the season. To fill out the podium, Ty Gibbs of Joe Gibbs Racing and Taylor Gray of David Gilliland Racing would finish second and third respectively.