The 1990 ECAC Hockey Men's Ice Hockey Tournament was the 29th tournament in league history. It was played between February 27 and March 11, 1990. Preliminary and quarterfinal games were played at home team campus sites, while the 'final four' games were played at the Boston Garden in Boston, Massachusetts. By winning the tournament, Colgate received the ECAC's automatic bid to the 1990 NCAA Division I Men's Ice Hockey Tournament. The Quarterfinal game between Colgate and Yale scheduled for March 3 was postponed until the following day due to a Zamboni malfunction.