Iran's counties (Persian: شهرستان, romanized as šahrestân) are administrative divisions of larger provinces (ostan).

Counties are divided into one or more districts (baxš بخش).

A typical district includes both cities (šahr شهر) and rural districts (dehestân دهستان), which are groupings of adjacent villages.

Each county is governed by an office known as farmândâri, which coordinates different public events and agencies and is headed by a farmândâr, the governor of the county and the highest-ranking official in the division.

Among the provinces of Iran, Fars has the highest number of shahrestans (37), while Qom has the fewest (3).