The 2003 Conference USA men's basketball tournament was held March 12–15 at Freedom Hall in Louisville, Kentucky. Louisville defeated upstart UAB in the championship game, 83–78, to clinch their first Conference USA men's tournament championship. The Cardinals, in turn, received an automatic bid to the 2003 NCAA tournament. They were joined in the tournament by fellow C-USA members Cincinnati, Marquette, and Memphis, all of whom earned at-large bids.