Nyagqu County (, Nyagchukha, Nyagquka) or Yajiang County (), named after Nyagchukha in Tibetan, is a county of the traditional Kham Region of eastern Tibet. It is currently under the administration of the Garzê Tibetan Autonomous Prefecture, in the west of Sichuan Province, China.
Yajiang County is divided into 6 towns and 10 township.