Günther Messner (18 May 1946 - 29 June 1970) was an Italian mountaineer from South Tyrol and the younger brother of Reinhold Messner. Günther climbed some of the most difficult routes in the Alps during the 1960s, and joined the Nanga Parbat-Expedition in 1970 just before the beginning of the expedition due to an opening within the team.