Shan is the native language of the Shan people and is mostly spoken in Shan State, Myanmar. It is also spoken in pockets in other parts of Myanmar, in Northern Thailand, in Yunnan, in Laos, in Cambodia, in Vietnam and decreasingly in Assam and Meghalaya. Shan is a member of the Kra–Dai language family and is related to Thai. It has five tones, which do not correspond exactly to Thai tones, plus a sixth tone used for emphasis. The term Shan is also used for related Northwestern Tai languages, and it is called Tai Yai or Tai Long in other Tai languages. Standard Shan, which is also known as Tachileik Shan, is based on the dialect of the city of Tachileik.
In 2019, Ethnologue estimated there were 3.3 million Shan speakers, including 3.2 million in Myanmar. The Mahidol University Institute for Language and Culture estimates there are gave the number of Shan speakers in Thailand as 95,000 in 2006. Many Shan speak local dialects as well as the language of their trading partners.