| Weng'an County | |
| Native Name: | 瓮安县 |
| Native Name Lang: | zh-Hans |
| Other Name: | Wengan |
| Postal Code: | 550400 |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Image Map1: | Location of Qiannan Prefecture within Guizhou (China).png |
| Map Caption1: | Qiannan in Guizhou |
| Coor Pinpoint: | Weng'an County government |
| Coordinates: | 27.0784°N 107.4709°W |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Guizhou |
| Subdivision Type2: | Autonomous prefecture |
| Subdivision Name2: | Qiannan |
| Seat Type: | County seat |
| Seat: | Yongyang |
| Area Code: | 0854 |
| Area Total Km2: | 1973.8 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Population Total: | 380,458 |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Weng'an County is a county in Qiannan Buyei and Miao Autonomous Prefecture, Guizhou, China.
Weng'an has an area of 1973.8 square kilometers and a population of 460,600 as of 2003.[1]
On June 28, 2008, a riot happened here.
Weng'an County is divided into 2 subdistricts, 10 towns and 1 township:[2]