Weng'an County (simplified Chinese: 瓮安县; traditional Chinese: 甕安縣; pinyin: Wèng'ān Xiàn) 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]