Zhenyuan County (simplified Chinese: 镇原县; traditional Chinese: 鎮原縣; pinyin: Zhènyuán Xiàn) is a county in the east of Gansu province, China, bordering Ningxia to the west.

One of the earliest Paleolithic sites in China, Dongdonggou, was found in Zhenyuan.

[3] In October 2019, the Zhenyuan County Library posted images of book burning of 65 books from the library.

The post attracted significant controversy on Chinese social media.

[4][5] Zhenyuan County is divided to 13 towns and 6 townships.