Luhuo County or Zhaggo (; ) is a county of Sichuan Province, China. It is under the administration of the Garzê Tibetan Autonomous Prefecture.
On March 24, 1923, a magnitude 7.3 earthquake struck between Luhuo and Dawu and killed 4800 people.
On February 6, 1973, a magnitude 7.6 earthquake occurred near Zhaggo, a town in the county.
Zhaggo County is divided into 4 towns and 11 townships: