Jamal ol Din Rural District () is in the Central District of Nazarabad County, Alborz province, Iran.
Jamal ol Din Rural District was created in the Central District in 2007. In 2010, the county was separated from the province in the establishment of Alborz province.
At the time of the 2016 census, the rural district's population was 1,443 people in 477 households. The most populous of its three villages was Karkhaneh-e Fakhr-e Iran, with 1,162 people.