Kosonsoy is a district of Namangan Region in Uzbekistan. The capital lies at the city Kosonsoy. Its area is 517 km<sup>2</sup>. Its population is 212,900 (2021 est.).
The district consists of one city (Kosonsoy), 10 urban-type settlements (Bogûishamol, Istiqlol, Koson, Ququmboy, Ozod, Tergachi, Chindavul, Chust koûcha, Yangiyoûl, Yangi shahar) and 7 rural communities.