The Yi or Lolo people (Nuosu: ꆈꌠ [nɔ̄sū]; Chinese transcription: 诺苏, pinyin: Nuòsū; Chinese: 彝族; pinyin: Yízú; Vietnamese: Lô Lô; Thai: โล-โล, Lo-Lo) are an ethnic group in China, Vietnam, and Thailand. Numbering 8 million, they are the seventh largest of the 55 ethnic minority groups officially recognized by the People's Republic of China. They live primarily in rural areas of Sichuan, Yunnan, Guizhou, and Guangxi, usually in mountainous regions. As of 1999, there were 3,300 "Lô Lô" people living in Hà Giang, Cao Bằng, and Lào Cai provinces in northeastern Vietnam. Most Yi are farmers; herders of cattle, sheep and goats; and nomadic hunters.^{[citation needed]}

The Yi speak Yi, a mixture of Tibeto-Burman languages closely related to Burmese. The prestige dialect is Nuosu, which is written in the Yi script and Chinese transliteration.