| Fanshi County | |
| Native Name: | [1] |
| Other Name: | Fansze |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Pushpin Map: | China Shanxi |
| Pushpin Label: | Fanshi |
| Pushpin Map Caption: | Location of the seat in Shanxi |
| Subdivision Type: | Country |
| Subdivision Name: | People's Republic of China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Shanxi |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Xinzhou |
| Population: | 250,409 |
| Population As Of: | 2020[2] |
| Population Density Km2: | auto |
| Coordinates: | 39.189°N 113.266°W |
| Timezone: | China Standard |
| Utc Offset: | +8 |
| Order: | st |
| P: | Fánshì Xiàn |
| W: | Fan-shih Hsien |
Fanshi County, is a county in Xinzhou City, in the northeast of Shanxi Province, China, bordering Hebei province to the southeast. It is the easternmost county-level division of Xinzhou.
Fanshi County was one of the divisions of Yanmen Commandery under the Qin and Han.
Fanshi is located north of Mount Wutai and east of Daixian.
The primary industry of Fanshi county is gold mining.