The 2008–09 Gonzaga Bulldogs men's basketball team represented Gonzaga University in the 2008-09 NCAA Division I men's basketball season.

The Bulldogs are members of the West Coast Conference, were led by head coach Mark Few, and played their home games at the McCarthey Athletic Center on the Gonzaga campus in Spokane, Washington.

The Zags finished the season 28–6, 14–0 in WCC play to claim the regular-season championship.

They advanced to the championship game of the 2009 West Coast Conference men's basketball tournament where they won the championship game against Saint Mary's.

They received an invitation to the 2009 NCAA Division I men's basketball tournament, earning 4 seed in the South Region.