The Tai Lü people (Chinese: 傣仂, Vietnamese: Người Lự) are an ethnic group of Vietnam, China, Laos and Thailand. They speak a Tai language. In Vietnam, most Lu live in Lai Châu Province, and their population was 4,964 in 1999. In China, they are officially recognized as part of the Dai ethnic group. The population in Thailand, where they are called Thai Lue (Thai: ไตลื้อ), was in 1993 CE estimated to be approximately 78,000. Most Thai Lue in Thailand live in Nan, Chiang Rai, Phayao and Chiang Mai Province.
In Vietnam, Lu are the indigenous people in Mường Thanh ("Land of the God of Tai people", Tai Lü: muong theng). They had built Tam Vạn wall in Mường Thanh and managed there for 19 generations before Hoàng Công Chất, a Thai leader, came. The Lu take their father's last name and have the middle name Bạ (for males) and Ý (for females). Their religion is TheravadaBuddhism. They sing khắp lự and play pí me luk ("mother-children" flute).