Colin Haley (born 2 September 1984) is an American alpinist known for fast ascents of technical routes on mountains around the world.

He began studying engineering, but soon switched to geology so he could "have more free time in his future".

In 2016, Haley and Alex Honnold completed two big traverses in Patagonia in record time.

[26] In 2009, he and Norwegian Bjørn-Eivind Årtun made the fourth ascent of the Grison-Tedeschi route on Mount Hunter.

[30] Haley set the speed record for climbing the Cassin Ridge on Denali in June 2018 in 8 hours and 7 minutes 'schrund-to-summit.