The 2021 Atlantic Hockey Tournament was the 17th edition of the Atlantic Hockey Tournament. It was played between March 8 and March 20, 2021 entirely at home campus locations. On March 5, 2021, Holy Cross withdrew from the tournament due to a positive COVID test. This resulted in Sacred Heart receiving a bye into the quarterfinal round. First Round and Quarterfinal games took place at home venues while Semifinal a Championship games were held at the MassMutual Center, the home of American International. By winning the tournament, American International earned Atlantic Hockey's automatic bid to the 2021 NCAA Division I Men's Ice Hockey Tournament.