Duncan "Dougal" Curdy MacSporran Haston (19 April 1940 – 17 January 1977) was a Scottish mountaineer noted for his exploits in the British Isles, Alps, and the Himalayas. From 1967 he was the director of the International School of Mountaineering at Leysin, Switzerland, a role he held until his death in an avalanche while skiing above Leysin.