The Central District of Aradan County () is in Semnan province, Iran. Its capital is the city of Aradan.
In 2011, Aradan District was separated from Garmsar County in the establishment of Aradan County, which was divided into one district of two rural districts, with Aradan as its capital and only city at the time. Later in the same year, Hoseynabad-e Kordehha Rural District was created in the Central District, and Kohanabad Rural District was separated from it in the formation of Kohanabad District.
At the time of the 2016 National Census, the district's population was 11,060 inhabitants in 3,838 households.