Sêrxü County (Tibetan: སེར་ཤུལ་རྫོང་།; Chinese: 石渠县), also known as Sershul, Dzachuka, Serxu, or Shiqu is a county of the Garzê Tibetan Autonomous Prefecture in the northwest of Sichuan Province, China, bordering Qinghai to the west and the Tibet Autonomous Region to the southwest.

The human population of Shiqu County was approximately 63,400, 96.8% of which were ethnic Tibetans.

Sershul District villages include: Ariksar, Bumser, Changma, Dezhongma, Dzagyel, Geming, Gotsa, Junyung, Jowo, Kabshi, Kilung, Kyewu, Sershul Gompa, Serxu Dzong, Shaksa, Tromsa Genma, Tseboum Soumdo, Tsemkhog, Ombo and Wathul.

Sershul District has several monasteries, including: Ju Mohar, Sershul Monastery, Bumser Gonpo, Ariksar, Dzagyel, Changma, Trikar, Kabshi and Jowo; and the Gsumge Mani Stone Castle, a religious complex built out of mani stone tablets.

Sêrxü County is divided into 7 towns and 14 townships: The population of the district was 62,408 inhabitants in 1999.