Liangshan Yi Autonomous Prefecture (Northern Yi: /nɛ˨˩ʂa˧/) is an autonomous prefecture occupying much of the southern extremity of Sichuan province, People's Republic of China. Its seat is Xichang. Liangshan covers an area of 60,261 km (23,267 sq mi) and has over 4.8 million inhabitants as of 2020. It has the largest population of ethnic Yi (or Nosu) among China's prefectures. Liangshan contains a number of isolated villages high up on its cliffs, often known as "cliff villages".
Xichang has the Xichang Qingshan Airport and the Xichang Satellite Launch Center. The prefecture also features a substantial network of railways for both passengers and freight.