| Haiyuan | |
| Native Name: | Chinese: 海原县 Chinese: خَيْيُوًا ثِيًا |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Image Map1: | Location of Zhongwei Prefecture within Ningxia (China).png |
| Map Caption1: | Zhongwei in Ningxia |
| Coordinates: | 36.565°N 105.6434°W |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Autonomous region |
| Subdivision Name1: | Ningxia |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Zhongwei |
| Seat Type: | County seat |
| Seat: | Sanhe |
| Area Total Km2: | 4989.55 |
| Population As Of: | 2019 |
| Population Density Km2: | auto |
| Population Total: | 470,000 |
| Timezone: | China Standard |
| Utc Offset: | +8 |
| Population Rural: | 78% |
| Population Blank1 Title: | Hui |
| Population Blank1: | 70% |
Haiyuan County (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. It is bordered by Gansu to the west. The county has a total area of 6897km2, and a population of approximately 470,000 people as of 2019. It was the site of the 1920 Haiyuan earthquake, which killed at least 200,000 people within and outside of Haiyuan.
Haiyuan County has many residents of the Hui ethnicity. They make up 70 percent of the total population.[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. Haiyuan is one of the poorest counties in Ningxia. The county government is located in the town of Haicheng, and the county's postal code is 751800.
Haiyuan County administers 5 towns and 12 townships.[2]