Sêrtar County (or Serthar County; Tibetan: གསེར་ཐར། ; pinyin: Sèdá Xiàn) is a county of Sichuan Province, China. It is one of the 18 counties under the administration of the Garzê Tibetan Autonomous Prefecture, covering some 9340 square kilometres. Sêrtar, which means "golden horse" in Tibetan, lies in the southeast of the Tibetan Plateau and in the historical region of Kham.