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Gasherbrum III (Template:Langx); Template:Zh), surveyed as K3a, is a summit in the Gasherbrum massif of the Baltoro Muztagh, a subrange of the Karakoram on the border between Xinjiang, China and Gilgit-Baltistan, Pakistan.<ref name="disputed"/> It is situated between Gasherbrum II and IV.
Gasherbrum III fails to meet a Template:Convert topographic prominence cutoff to be an independent mountain; hence it can be considered a subpeak of Gasherbrum II.<ref name="prom">Some sources use a lower cutoff value, and consider Gasherbrum III to be independent.</ref>
Gasherbrum III was one of the highest unclimbed summits in the world<ref name="unclimbed">In fact no summit in 1975 was both higher and more topographically prominent.</ref> up to its first ascent in 1975, by Wanda Rutkiewicz, Alison Chadwick-Onyszkiewicz, Janusz Onyszkiewicz and Krzysztof Zdzitowiecki, members of a Polish expedition.<ref>Template:Cite book</ref>