The Central District of Farahan County () is in Markazi province, Iran. Its capital is the city of Farmahin.
After the 2006 National Census, Khenejin Rural District was separated from Komijan County, and Farahan District from Tafresh County, in the establishment of Farahan County, which was divided into two districts of two rural districts each, with Farmahin as its capital and only city at the time.
At the time of the 2011 census, the district's population was 17,118 people in 5,612 households, by which time the district had been separated from the county in the establishment of Farahan County. The 2016 census measured the population of the district as 16,237 inhabitants in 5,685 households.