The 2003 Mountain West Conference men's basketball tournament was played at the Thomas & Mack Center in Las Vegas, Nevada, from March 13–15, 2003.
Colorado State upset host school University of Nevada at Las Vegas, 62–61, in the championship game to win the Mountain West Conference tournament and the league's automatic NCAA Tournament bid.
[2] Colorado State became, and as of 2011, remains the lowest seed (6) to ever win the MWC Tournament.
They supplanted San Diego State who, just one year earlier, had won the tournament as a number 5 seed.
In 2004 the tournament would move to the Pepsi Center in Denver where it would stay for the next three years.