The 2003–04 NCAA Division I men's ice hockey season began on October 3, 2003 and concluded with the 2004 NCAA Division I Men's Ice Hockey Tournament's championship game on April 10, 2004 at the Fleet Center in Boston, Massachusetts. This was the 57th season in which an NCAA ice hockey championship was held and is the 109th year overall where an NCAA school fielded a team. The 2003-04 season was the inaugural year for the Atlantic Hockey Association after the discontinuation of Division I ice hockey sponsorship by the MAAC at the conclusion of the previous season.