| Division: | II |
| Year: | 2004 |
| Gender: | Men's |
| Teams: | 64 |
| Finalfourcity: | Centennial Garden Bakersfield, California |
| Champions: | Kennesaw State |
| Titlecount: | 1st |
| Runnerup: | Southern Indiana |
| Gamecount: | 3rd |
| Semifinal1: | Humboldt State |
| Finalfourcount: | 1st |
| Semifinal2: | Metro State |
| Finalfourcount2: | 4th |
| Coach: | Tony Ingle |
| Coachcount: | 1st |
| Mop: | Terrence Hill |
| Mopteam: | Kennesaw State |
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.
The Owls were coached by Tony Ingle. Kennesaw State's Terrence Hill was the Most Outstanding Player.
Location: Neil Carey Arena Host: Lewis University
Location: Wisdom Gymnasium Host: Tarleton State University
Location: The Complex Host: Valdosta State University
Location: Auraria Events Center Host: Metropolitan State University
Location: Merner Gym Host: Pfeiffer University
Location: KSU Convocation Center Host: Kennesaw State University
Location: Costello Gym Host: University of Massachusetts at Lowell
Location: Coussoulis Arena Host: California State University, San Bernardino
Location: Bakersfield Centennial Garden Host: California State University, Bakersfield