Zhenyuan County (Chinese: 镇原县; pinyin: Zhènyuán Xiàn) is an administrative district in Gansu, China. It is one of 58 counties of Gansu. It is part of the Qingyang prefecture, with the city of the same name being the prefecture seat. Its postal code is 744500, and its population in 1999 was 491,630 people.
Coordinates: 35°46′N 107°11′E / 35.767°N 107.183°E