The 1969–70 Cornell Big Red men's ice hockey team represented Cornell University in college ice hockey. In its 7th year under head coach Ned Harkness the team compiled a 29–0–0 record and reached the NCAA tournament for the fourth consecutive year. The Big Red defeated Clarkson 6–4 in the championship game at the Jack Shea Arena in Lake Placid, New York to become the first and only (as of 2019) undefeated and untied national champion in college ice hockey history.