Zarjabad Rural District (Persian: دهستان زرج آباد) is in Firuz District of Kowsar County, Ardabil province, Iran. Its capital is the village of Zarjabad.

At the census of 2006, its population was 3,587 in 776 households. There were 3,131 inhabitants in 850 households at the following census of 2011. In the most recent census of 2016, the population of the rural district was 2,233 in 698 households. The most populous of its 13 villages was Zarjabad, with 778 people.