Yinyuan () is a town in Yuanjiang Hani, Yi and Dai Autonomous County, Yunnan, China. As of the 2017 census it had a population of 28,739 and an area of .
As of 2016, the town is divided into two communities and seven villages:
It lies at the southwestern of Yuanjiang Hani, Yi and Dai Autonomous County, bordering Mojiang Hani Autonomous County to the west, Honghe County to the south, Mili Township to the north, and Yangjie Township to the east.
The town experiences a marine monsoon climate, with an average annual temperature of and total annual rainfall of .
The Wulong Reservoir () is a reservoir located in the town.
At the end of 2023 and the beginning of 2024, the resident population was 193,000, with an urbanization rate of 49.48%. The male population was 100,400, and the female population was 92,600. There were 29,800 individuals aged 0-14, 32,600 aged 0-15, 128,400 aged 16-59, 32,000 aged 60 and above, and 23,700 aged 65 and above. The total number of registered households was 67,687, with a registered population of 211,195, including 108,719 males and 102,476 females. The age distribution included 40,459 individuals aged 0-17, 50,632 aged 18-34, 86,912 aged 35-59, and 33,192 aged 60 and above. The ethnic population included 93,819 Hani, 46,048 Yi, and 25,693 Dai.
The town's economy is based on nearby mineral resources and agricultural resources. Commercial crops include tobacco, tea, and rape. The region also has an abundance of gold, silver, nickel, iron, asbestos, and serpentine. The nickel reserves in the town rank second in China.
The National Highway G213 winds through the town.