Farahabad-e Jonubi Rural District () is in Rudpey-ye Shomali District of Sari County, Mazandaran province, Iran. Its capital is the village of Panbeh Chuleh-ye Pain.
In 2010, Rudpey-ye Jonubi and Rudpey-ye Shomali Rural Districts were separated from the Central District in the formation of Rudpey District. In 2012, Rudpey-ye Shomali Rural District was separated from the district in the formation of Rudpey-ye Shomali Districtand renamed Farahabad-e Shomali Rural District. Farahabad-e Jonubi Rural District was created in the new district.
The 2016 National Census measured the population of the rural district as 5,826 in 1,846 households. The most populous of its 13 villages was Esfandan, with 973 people, the same reported for the rural district's capital.