The 1966 NCAA Men's University Division Ice Hockey Tournament was the 19th such tournament in NCAA history. It was held between March 17 and 19, 1966, and concluded with Michigan State defeating Clarkson 6 to 1. All games were played at the Williams Arena in Minneapolis, Minnesota. The ECAC tournament champion and the two WCHA tournament co-champions received automatic bids into the tournament. An at-large bid was offered to a second eastern team based upon both their ECAC tournament finish as well as their regular season record. Despite winning the ECAC tournament the ECAC champion was not seeded as the top eastern team; this occurred because the at-large team played and won more games, both in conference and overall.