Nanzhao, also spelled Nanchao or Nan Chao, was a polity that flourished in what is now southern China and Southeast Asia during the 8th and 9th centuries. It was centered on present-day Yunnan in China.

Nanzhao encompassed many ethnic and linguistic groups. Some historians believe that the majority of the population were of the Bai people, but that the elite spoke a variant of Nuosu (also called Yi), a Tibeto-Burman language closely related to Burmese. The people of Nanzhao were sometimes known as the Black or White Mywa.

Originally, there were several tribes that settled on the fertile land around the alpine fault lake Erhai. These tribes were called Mengshe (蒙舍), Mengsui (蒙嶲), Langqiong (浪穹), Dengtan (邆賧), Shilang (施浪), and Yuexi (越析). Each tribe had its own kingdom, known as a zhao. In 704 the Tibetan Empire made these kingdoms into vassals or tributaries. In the year 737 AD, with the support of the Tang Dynasty of China, Piluoge (皮羅閣) united the six zhaos in succession, establishing a new kingdom called Nanzhao (Mandarin, "Southern Zhao"). The capital was established in 738 at Taihe, (the site of modern-day Taihe village, a few miles south of Dali). Located in the heart of the Erhai valley, the site was ideal: it could be easily defended against attack and it was in the midst of rich farmland.

In 748, Piluoge died and was succeeded by his son Geluofeng (閣羅鳳). When the Chinese prefect of Yunnan attempted to rob Nanzhao envoys in 750, Geluofeng attacked, killing the prefect and seizing nearby Tang territory. In retaliation, the Tang governor of Jiannan, Xianyu Zhongtong, attacked Nanzhao with an army of 80,000 soldiers in 751. He was defeated by Duan Jianwei (段俭魏) with heavy losses (many due to disease) at Xiaguan. Duan Jianwei's grave is two kilometres west of Xiaguan, and the Tomb of Ten Thousand Soldiers is located in Tianbao Park. In 754, another Tang army of 100,000 soldiers, led by General Li Mi (李宓), approached the kingdom from the north, but never made it past Mu'ege. By the end of 754, Geluofeng had established an alliance with the Tibetans against the Tang that would last until 794.

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