Birk Rural District () is in Birk District of Mehrestan County, Sistan and Baluchestan province, Iran. Its capital is the village of Regentog.
At the National Census of 2006, its population was 6,648 in 1,461 households, when it was a part of the former Zaboli District of Saravan County. There were 8,683 inhabitants in 2,005 households at the following census of 2011, by which time the district had been separated from the county and become a part of the newly established Zaboli County (renamed Mehrestan County). At the most recent census of 2016, the population of the rural district was 11,057 in 2,591 households. The largest of its 77 villages was Chahuk, with 1,320 people.