The 2021 NCAA Division I men's ice hockey tournament was the national championship tournament for men's college ice hockey in the United States, scheduled for March 26–April 10, 2021. The tournament involved 16 teams in single-elimination play to determine the national champion at the Division I level of the National Collegiate Athletic Association (NCAA), the highest level of competition in college hockey. The first two rounds took place at four regional sites on March 26–28, and the tournament's Frozen Four – the semifinals and finals – was hosted by Robert Morris University at the PPG Paints Arena in Pittsburgh from April 8 to 10.