Xinyuan County () as the official romanized name, also transliterated from Uyghur as Künas County (; ), is a county in the Xinjiang Uyghur Autonomous Region and is under the administration of the Ili Kazakh Autonomous Prefecture. It contains an area of 7,581 km<sup>2</sup>. According to the 2002 census, it has a population of 290,000. The county is served by Xinyuan Nalati Airport.
The county's original name Künes was changed into Xinyuan in 1946 after the county established its seat on the Künes River () upstream. "Xinyuan" means "New Headstream" in Chinese.
Xinyuan County is divided into 9 towns and 2 townships.
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