Nyima County (; ) is the westernmost county-level division under the administration of the prefecture-level city of Nagqu, Tibet Autonomous Region, China. The northern part of the county is within the Changtang area.
With an area of and a population of 33,006 (2020), it has an average population density of approximately 0.53 people per square kilometre.
It is situated in the central-northern part of the Tibetan Plateau, between Nagqu's Shuanghu County to the east and Ngari's Gêrzê County to the west.
The county is divided into 1 town and 13 townships: