Haiyuan County (simplified Chinese: 海原县; traditional Chinese: 海原縣; pinyin: Hǎiyuán Xiàn; Wade–Giles: Hai-yüan Hsien, Xiao'erjing: خَيْ‌يُوًا ثِيًا) is a county under the administration of the prefecture-level city of Zhongwei in the southwest of the Ningxia Hui Autonomous Region of China.

The county has a total area of 6,897 km2 (2,663 sq mi), and a population of approximately 470,000 people as of 2019.

[1] Although agricultural development is important in the county, the arid climate, high alkaline content of the soil, and the course planting kernels make it difficult to retain moisture and fertility.

Due to these characteristics, farmers in the county have begun to develop organic fennel in recent years.

[citation needed] Haiyuan County administers 5 towns and 12 townships.