Atashgah (Persian: اتشگاه) is a village in, and the capital of, Arjestan Rural District of Sabalan District, Sareyn County, Ardabil province, Iran.

At the 2006 National Census, its population was 1,049 in 253 households, when it was in Sabalan Rural District of the former Sareyn District of Ardabil County. The following census in 2011 counted 1,102 people in 340 households, by which time the district had been separated from the county in the establishment of Sareyn County. The latest census in 2016 showed a population of 946 people in 294 households.