Koy Sanjaq District (; ) is a district in the Kurdistan Region, Iraq. The administrative centre of the district is Koya. The district encompasses five sub-districts: Shorash, Ashti, Siktan, Segrdkan and Taqtaq Subdistrict. Ashti has 22 villages, Taqtaq Subdistrict includes 26 villages, Segrdkan has 11 villages, while Shorash and Siktan do not have detailed statistics. It is neighbored from the east and south by the Little Zab river, which separates it from the Governorate of Kirkuk and Suleimaniyah. It is bordered to the northeast by Mount Haibat Sultan and embraced by Mount Bawaji to the west. The district contains one university, called Koya University.
The population of Koy Sanjaq District was estimated 113,038 in 2018. However, another statistic from 2020 says the population is 95,186 people.