Sanjabad-e Shomali Rural District () is in the Central District of Kowsar County, Ardabil province, Iran. Its capital is the village of Khalfelu.
At the time of the 2006 National Census, the rural district's population was 5,182 in 1,039 households. There were 4,765 inhabitants in 1,177 households at the following census of 2011. The 2016 census measured the population of the rural district as 3,517 in 960 households. The most populous of its 27 villages was Karandaq, with 502 people.