Weiyuan County is an administrative district in Gansu, the People's Republic of China. It is one of 62 counties of Gansu. It is part of the Dingxi prefecture, with the city of the same name being the prefecture seat. Its postal code is 748200, and its population in 1999 was 335,568 people.
Coordinates: 35°08′N 104°11′E / 35.133°N 104.183°E