Osku County (Persian: شهرستان اسکو) is in East Azerbaijan province, Iran.

[3] Osku is one of the oldest cities in East Azerbaijan, according to old books, and is like stepping into a time machine.

Attractions such as Kandovan and natural landscapes make Osku one of the touristic cities in Iran.

It is one of the few cities in Iran where batik printing centers still remain in operation.

[2] Osku County's population history and administrative structure over three consecutive censuses are shown in the following table.