The 2008–09 GMHL season was the third season of the Greater Metro Junior A Hockey League (GMHL). The fifteen teams of the GMHL played 43-game schedules. In February 2009, the top teams of the league played down for the Russell Cup, emblematic of the grand championship of the GMHL. Since the GMHL is independent from Hockey Canada and the Canadian Junior Hockey League, this is where the GMHL's season ended. The South Muskoka Shield won their first Russell Cup beating the Deseronto Storm 4-games-to-2.