The 2003 Atlantic 10 Men's Basketball Tournament was played from March 10 to March 15, 2003. The winner was named champion of the Atlantic 10 Conference and received an automatic bid to the 2003 NCAA Men's Division I Basketball Tournament. The University of Dayton won the tournament and got the conference's automatic bid to the NCAA Tournament. Xavier and Saint Joseph's also received bids to the NCAA Tournament. Rhode Island, Richmond and Temple received bids to the 2003 National Invitation Tournament. of Dayton was named the tournament's Most Outstanding Player. Future NBA players Jameer Nelson of Saint Joseph's and David West of Xavier were among those joining Marshall on the All-Championship Team.