Dujiangyan is a county-level city of Chengdu, capital of southwest China's Sichuan Province. It covers an area of 1208 square kilometers with a population of 600,000 in 2003.

Historically known as Guanxian, the city was renamed in honor of the Dujiangyan Irrigation System, located in the northwestern area of the city, famous for still providing neighboring major city Chengdu with water even though it was built around 250 BC.