Tasuj (, also Romanized as Ţasūj and Tasooj; also known as Tasūch) is a city in, and the capital of, Tasuj District of Kavar County, Fars province, Iran, and also serves as the administrative center for Tasuj Rural District.
At the 2006 census, its population was 5,814 in 1,243 households, when it was a village in Tasuj Rural District of the former Kavar District of Shiraz County. The following census in 2011 counted 5,136 people in 1,249 households, by which time the district had been separated from the county in the establishment of Kavar County. The latest census in 2016 showed a population of 4,555 people in 1,141 households.
After the census, the village of Tasuj was elevated to the status of a city.