Gasherbrum III, Mountain summit in Karakoram Range, Pakistan and China

Gasherbrum III is a mountain in the Karakoram Range on the border between Pakistan and China. Its slopes feature steep snowfields and glaciers that create technical climbing challenges across multiple routes.

Gasherbrum III was one of the highest unclimbed summits in the world until 1975, when a Polish expedition made the first ascent. The team comprised Wanda Rutkiewicz, Alison Chadwick-Onyszkiewicz, Janusz Onyszkiewicz and Krzysztof Zdzitowiecki. Because its topographic prominence falls below 500 metres, it is counted as a subpeak of Gasherbrum II rather than an independent mountain.

The name Gasherbrum is often rendered as "shining wall", a reference to the massif's glaciated faces. The Balti people live in the valleys below the Baltoro Muztagh, and Balti porters and guides have carried loads for Karakoram expeditions since the 19th century. Gasherbrum III stands on the border between Gilgit-Baltistan and Xinjiang.

Climbers need several weeks of acclimatization at base camp before attempting the technical ascent. The climbing season falls during the brief summer months when weather and snow conditions are most favorable.

Gasherbrum III is a subpeak of Gasherbrum II: its topographic prominence falls below the 500-metre cutoff used to define an independent mountain. It was surveyed as K3a, and the Polish 1975 first-ascent team included Wanda Rutkiewicz and Alison Chadwick-Onyszkiewicz.