The 2009 WAC men's basketball tournament, a part of the 2008-09 NCAA Division I men's basketball season, was held March 10–14 at the Lawlor Events Center in Reno, Nevada.
Regular season champion Utah State won the tournament, defeating host by ten points in the title game. The Aggies received the Western Athletic Conference's automatic bid to the NCAA tournament; they were seeded eleventh in the West region and lost by a point in the first round to Marquette.
No other WAC teams were invited to the NCAA or National Invitation Tournament (NIT). Nevada and lost in the first round of the CBI, and Idaho advanced to the second round of the CIT.