The 2021 BYU Cougars baseball team represented Brigham Young University during the 2021 NCAA Division I baseball season. Mike Littlewood acted as head coach of the Cougars for a ninth consecutive season. The Cougars were picked to finish fourth in the WCC Pre-season poll. The Cougars entered the season after having watched the WCC cancel the 2020 season due to the COVID-19 pandemic. As a cost containment measure, the WCC cut the 2021 baseball tournament, so the regular season champion will got the conferences auto-bid to the NCAA Tournament. The Cougars went 23–27 overall, 15–12 in conference, and finished fourth in the standings.