Marcus Schmuck (April 18, 1925 - August 21, 2005) was an Austrian mountaineer. In 1957, together with Hermann Buhl he organized the expedition, firstly envisaged and initiated by Buhl, to climb the world's 12th highest peak, the Broad Peak (8,047 metres) in the Karakoram in Pakistan. The other members of the expedition were: Fritz Wintersteller and Kurt Diemberger. In his later years, he successfully organized and led 74 expeditions to the high mountains around the world.