Qaleh Chay District (Persian: بخش قلعه‌چای‎‎) is a district (bakhsh) in Ajab Shir County, East Azerbaijan Province, Iran. At the 2006 census, its population was 18,724, in 4,204 families. The District has no cities. The District has two rural districts (dehestan): Dizajrud-e Sharqi Rural District and Kuhestan Rural District.