Sarajuy-ye Jonubi Rural District () is in Saraju District of Maragheh County, East Azerbaijan province, Iran. Its capital is the village of Aghcheh Kohel. The previous capital of the rural district was the village of Gol Tappeh.
At the time of the 2006 National Census, the rural district's population was 2,961 in 596 households. There were 3,224 inhabitants in 845 households at the following census of 2011. The 2016 census measured the population of the rural district as 2,957 in 1,030 households. The most populous of its 16 villages was Aghcheh Kohel, with 761 people.