Hilaree Nelson (née Hilaree O'Neill) (born 13 December 1972) is an American ski mountaineer and the first female to summit two 8000-meter peaks (Everest and Lhotse) in one 24 hour push on 25 May 2012. On 30 September 2018, Nelson and partner Jim Morrison made the first ski descent of the Dream Line, the Lhotse Couloir from the summit. Lhotse is the 4th-tallest mountain in the world and shares a saddle with Mount Everest.