Kaj Kolah (Persian: كج كلاه, also Romanized as Kaj Kolāh; also known as Gach Kolāh, Kush Kalekh, and Kūsh Qal‘eh) is a village in Bonab Rural District, in the Central District of Zanjan County, Zanjan Province, Iran. At the 2006 census, its population was 46, in 13 families.