Chaharbagh (); formerly, Chahar Dangeh (Persian: چهار دانگه), also Romanized as Chahār Dāngeh, is a city in the Central District of Chaharbagh County, Alborz province, Iran, and serves as capital of the county.
At the National Census in 2006, its population was 5,577 in 1,448 households, when it was in Chaharbagh District of Savojbolagh County, Tehran province. At the most recent census in 2016, the city had 48,828 inhabitants in 14,380 households, by which time the county had become part of the newly established Alborz province.
Chaharbagh District was separated from the county on 16 December 2019 to become Chaharbagh County and divided into two districts: the Central District and Ramjin District. Chaharbagh became the capital of the county.