The 2003 NCAA Division II men's basketball tournament was the 47th annual single-elimination tournament to determine the national champion of men's NCAA Division II college basketball in the United States. Officially culminating the , the tournament featured, for the first time, sixty-four teams from around the country. The Elite Eight, national semifinals, and championship were played, for the first time, at the Lakeland Center in Lakeland, Florida. Northeastern State (32–3) defeated Kentucky Wesleyan in the final, 75–64, to win their first Division II national championship.