The 2008–09 WHL season was the 43rd season of the Western Hockey League (WHL). The regular season began on September 18, 2008, and ended on March 15, 2009. The WHL Playoffs commenced on March 20, 2009, and the 2008 ADT Canada Russia Challenge series, featuring Team WHL versus the Russian Selects, took place from November 26–27, 2008. The Kelowna Rockets won the Ed Chynoweth Cup as WHL champions.

The Scotty Munro Memorial Trophy is awarded annually to the regular season champion of the Western Hockey League. It is named after one of the league's founders, Scotty Munro. Munro served as the general manager of the Estevan Bruins, one of the league's founding franchises, and later as the head coach and general manager of the Calgary Centennials.