Zu ol Bin (Persian: ذوالبين, also Romanized as Z̄ū ol Bīn; also known as Dowlbeyn, Zolbeyn, and Zūlbīn) is a village in Qaranqu Rural District, in the Central District of Hashtrud County, East Azerbaijan Province, Iran. At the 2006 census, its population was 1,099, in 241 families.