Weishan Yi and Hui Autonomous County (Chinese: 巍山彝族回族自治县; pinyin: Wēishān Yízú Huízú Zìzhìxiàn; Xiao'erjing: وِشًا یِذُو خُوِذُو ذِجِشِیًا) is an autonomous county in the Dali Bai Autonomous Prefecture of Yunnan Province, China. It was known as Menghua (蒙化) until the 1950s.