The 2018–19 NCAA Division I men's ice hockey season began in October 2018 and ended with the Frozen Four in April 2019. This was the 72nd season in which an NCAA ice hockey championship was held, and United States college ice hockey's 125th year overall.

The 2019 NCAA Division I men's ice hockey tournament was the national championship tournament for men's college ice hockey in the United States. 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 tournament's Frozen Four – the semifinals and finals – were hosted by the MAAC at the KeyBank Center in Buffalo, New York from April 11–13, 2019. This was the second Frozen Four in the city of Buffalo, as it previously hosted in 2003.