The 2004 NCAA Division III men's basketball tournament was the 30th annual single-elimination tournament to determine the national champions of National Collegiate Athletic Association (NCAA) men's Division III collegiate basketball in the United States.

The field contained forty-eight teams, and each program was allocated to one of four sectionals.

All sectional games were played on campus sites, while the national semifinals, third-place final, and championship finals were contested at the Salem Civic Center in Salem, Virginia.

[1] Wisconsin–Stevens Point defeated defending champions Williams, 84–82, in the championship, clinching their first national title.

Nick Bennett, also from Stevens Point, was named Most Outstanding Player.