2004 NAIA Division II men's basketball tournament

The 2004 NAIA Division II men's basketball tournament was the tournament held by the NAIA to determine the national champion of men's college basketball among its Division II members in the United States and Canada for the 2003–04 basketball season.

Oregon Tech defeated Bellevue (NE) in the championship game, 81–72, to claim the Owls' first NAIA national title.

The tournament was played at Keeter Gymnasium on the campus of the College of the Ozarks in Point Lookout, Missouri.

Qualification
The tournament field remained fixed at thirty-two teams, and the top sixteen teams were seeded.

The tournament continued to utilize a single-elimination format.