The 2004 NCAA Division II men's basketball tournament was the 48th annual single-elimination tournament to determine the national champion of men's NCAA Division II college basketball in the United States.
Officially culminating the 2003–04 NCAA Division II men's basketball season, the tournament featured sixty-four teams from around the country.
The Elite Eight, national semifinals, and championship were played at the Centennial Garden in Bakersfield, California, previously the venue of the 2001 finals.
Kennesaw State (35–4) defeated Southern Indiana in the final, 84–59, to win their first Division II national championship.
Kennesaw State's Terrence Hill was the Most Outstanding Player.