Zehak (Persian: زهک) is a city in the Central District of Zehak County, Sistan and Baluchestan province, Iran, serving as the capital of both the county and the district. It is also the administrative center for Zehak Rural District.

At the 2006 census, its population was 11,180 in 2,297 households. The following census in 2011 counted 14,324 people in 3,170 households. The latest census in 2016 showed a population of 13,357 people in 3,238 households.