The Central District of Savojbolagh County () is in Alborz province, Iran. Its capital is the city of Hashtgerd.
In 2007, two villages merged to form the new city of Seyfabad, renamed Golsar in 2010. In 2010, the county was separated from Tehran province in the establishment of Alborz province. The city of Shahr-e Jadid-e Hashtgerd was renamed Mehestan in 2023.
At the time of the 2006 National Census, the district's population (as a part of Tehran province) was 106,879 in 28,413 households. The 2016 census measured the population of the district as 153,675 in 47,980 households,