| Yên Thế | |
| Settlement Type: | Town |
| Pushpin Map: | Vietnam |
| Pushpin Label Position: | right |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Northeast |
| Subdivision Type2: | Province |
| Subdivision Name2: | Yên Bái |
| Subdivision Type3: | District |
| Subdivision Name3: | Lục Yên |
| Unit Pref: | Imperial |
| Area Total Km2: | 15.07 |
| Population Total: | 8,229 |
| Timezone: | UTC + 7 |
| Utc Offset: | +7 |
| Coordinates: | 22.0986°N 104.7644°W |
Yên Thế is a town and the capital of the Lục Yên District of Yên Bái Province, in the northeastern region of Vietnam.