Sanjabad-e Gharbi Rural District (Persian: دهستان سنجبد غربي) is in the Central District of Kowsar County, Ardabil province, Iran. Its capital is the village of Ganjgah.

At the census of 2006, its population was 9,025 in 1,859 households. There were 8,090 inhabitants in 2,168 households at the following census of 2011. In the most recent census of 2016, the population of the rural district was 6,881 in 2,055 households. The most populous of its 38 villages was Ganjgah, with 685 people.