Kermejegan Rural District () is in the Central District of Kahak County, Qom province, Iran. Its capital is the village of Kermejegan, whose population at the time of the 2016 National Census was 3,082 in 1,001 households.
After the 2016 census, Nofel Loshato District was separated from Qom County in the establishment of Kahak County, and Kermejegan Rural District was created in the Central District.