2003 NAIA Division II men's basketball tournament

The 2003 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 2002–03 basketball season.

Top-seeded Northwestern (IA) defeated unseeded Bethany (KS) in the championship game, 77–57, to claim the Red Raiders' second NAIA national title and second in three years.

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.