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.

Routes such as The Bat on the Carn Dearg Buttress of Ben Nevis helped establish the pair as future stars.

In 1965, shortly before his ascent of Harlin Direct on the Eiger, Haston was sentenced to 60 days in prison having run down and killed 18-year-old student James Orr whilst driving drunk.

In fact, it was done by Bonington and Ian Clough in 1962, but he made the first ascent of the Nordwand by the direttissima, or most direct route, in 1966 with Jörg Lehne, Günther Strobel, Roland Votteler and Siegfried Hupfauer.

[3] Haston was killed in an avalanche in January 1977 while skiing alone above Leysin on the northeast face of La Riondaz to the Col Luisset.