Qusar District (Gusar District; Azerbaijani: Qusar rayonu; Lezgian: КцIар район) is one of the 66 districts of Azerbaijan. It is located in the north-east of the country and belongs to the Guba-Khachmaz Economic Region. The district borders the districts of Quba, Qabala, Khachmaz, and the Russian Republic of Dagestan. Its capital and largest city is Qusar. As of 2020, the district had a population of 99,000.