噶廈（藏文：བཀའ་ཤག་，藏語拼音：Gaxag，威利：bkaʼ-shag），或譯“噶沙”，係噶倫辦理政事嘅地方，舊時曾經係西藏嘅行政中心。喺藏語又叫做第巴雄（藏文：སྡེ་པ་གཞུང་，威利：sde pa gzhung，「第巴政府」）、博雄（藏文：བོད་གཞུང་，威利：bod gzhung，「西藏政府」）。呢個機構喺清代乾隆十六年（1751年）成立。噶廈駐地喺拉薩大昭寺，長官係噶倫，跟達賴喇嘛（事實上係西藏攝政）指示做嘢。1912年清朝滅亡之後，駐藏大臣等等清朝官員返返去漢地。十三世達賴喇嘛返入西藏掌握軍政實權。之後由1912年到1959年期間，噶廈成為事實上嘅西藏政府。
The Kashag (Naughty Donkey Naughty-Shag), or the sand umbrella in translation, is the place where the government affairs of the Thuron were conducted and used to be the administrative center of Tibet. In Tibetan, it is also called Dipaxiong (Tibetan: naughty, willy: sde pa gz hung, "Diba government") and Boxiong (Tibetan: naughty, willy: bod gzhung, "Tibetan government"). This institution was established in the 16th year of Qianlong (1751) of the Qing Dynasty. The Kashag was stationed at the Jokhang Monastery in Lhasa, and the governor was Lun, who was instructed by the Dalai Lama (in fact, the regent of Tibet). After the fall of the Qing Dynasty in 1912, the Minister in Tibet and other Qing officials returned to Han. The 13th Dalai Lama returned to Tibet and took over the military and political power. Then, from 1912 to 1959, the Kashag became the de facto government of Tibet.