| Zuoyun County | |
| Other Name: | Tsoyun |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Pushpin Map: | China Shanxi |
| Pushpin Label: | Zuoyun |
| Coordinates: | 40.013°N 112.703°W |
| Subdivision Type: | Country |
| Subdivision Name: | People's Republic of China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Shanxi |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Datong |
| Area Total Km2: | 1314 |
| Population Total: | 117,943 |
| Population As Of: | 2020[1] |
| Population Density Km2: | auto |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Zuoyun County is a county in the north of Shanxi province, China, bordering Inner Mongolia to the north. It is the westernmost county-level division of the prefecture-level city of Datong.