Andrew James Lock OAM (born 26 December 1961) is an Australian high-altitude mountaineer. He became the first, and still remains the only, Australian to climb all 14 "eight-thousanders" (the peaks over 8,000-metres above sea level) on 2 October 2009, and is the 18th person to ever complete this feat. He climbed 13 of the 14 without using bottled oxygen, only using it on Mount Everest, which he has summited three times. He retired from eight-thousander climbing in 2012.