2003 Sun Belt Conference men's basketball tournament

The 2003 Sun Belt Conference men's basketball tournament was held March 7–11 at E. A. Diddle Arena in Bowling Green, Kentucky.

The top-seed in the East division Western Kentucky defeated West division #2 seed in the championship game, 64–52, to win their fifth Sun Belt men's basketball tournament.

The Hilltoppers, in turn, received an automatic bid to the 2003 NCAA tournament as the #13 seed in the West region. No other Sun Belt members earned bids to the tournament.

Format
All eleven participating Sun Belt members were seeded based on regular season conference records, with the five highest-seeded teams were awarded byes into the quarterfinal round while the six lowest-seeded teams entered the bracket in the preliminary first round.