2021 NCAA Division III Men's Ice Hockey Tournament

The 2021 NCAA Division III Men's Ice Hockey Tournament was to be the tournament to determine the men's national champion at the Division III level. The tournament was expanded to 12 teams from 11 teams in 2016. All rounds of the tournament have been single elimination. The first round and quarterfinal rounds were to be played at campus sites. The semifinal and final rounds were be held at the at a site to be determined after the quarterfinal round, more than likely at the highest remaining seed's arena. This is a change from a location already determined prior to the start of the season and reverts back to the system used through 2007. This will also be done with the 2021 tournament.

Cancellation
Also on February 3rd, the National Collegiate Athletic Association announced the cancellation of the 2021 NCAA Division III Men's Ice Hockey Tournament and the 2021 NCAA Division III Women's Ice Hockey Tournament as a result of many teams cancelling their playing seasons with less than half of the institutions that sponsored men's and women's ice hockey not playing for the 2020-21 season.

Pool A
Eight bids are guaranteed to the conference tournament champions of the following conferences
 * Commonwealth Coast Conference:
 * Massachusetts State Collegiate Athletic Conference:
 * Minnesota Intercollegiate Athletic Conference:
 * New England Hockey Conference:
 * New England Small College Athletic Conference:
 * Northern Collegiate Hockey Association:
 * State University of New York Athletic Conference:
 * United Collegiate Hockey Conference:

The Wisconsin Intercollegiate Athletic Conference champion is not guaranteed a berth in the tournament.

Pool C
Four spots will be awarded to at-large teams made by the selection committee.

First Round

 * defeated -
 * defeated -
 * defeated -
 * defeated -

Quarterfinals

 * defeated -
 * defeated -
 * defeated -
 * defeated -

Semifinals

 * defeated -
 * defeated -

Final

 * defeated -