The 2020–21 New York Islanders season was the 49th season in the franchise's history. It was their first full season in the Nassau Coliseum since returning to the arena full-time for the 2020–21 season, as well as their 45th overall and final season in the arena. In June 2020, the Nassau Coliseum's leaseholder announced that the arena would be closed and seek a new leaseholder, which was found in August 2020.