Nyima County (Tibetan: ཉི་མ་རྫོང་།; Chinese: 尼玛县) 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 62,349 km2 (24,073 sq mi) 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: This Nagqu Prefecture, Tibet location article is a stub.