Sarab Biz Rural District (Persian: دهستان سرابيز) is in the Central District of Basht County, Kohgiluyeh and Boyer-Ahmad province, Iran. Its capital is the village of Sarab Biz.

After the National Census of 2006, Basht District was separated from Gachsaran County in the establishment of Basht County, which was divided into two districts of two rural districts each, with the city of Basht as its capital and only city at the time.

At the census of 2011, its population was 2,924 in 635 households. At the most recent census of 2016, the population of the rural district was 2,475 in 635 households. The most populous of its 25 villages was Sarab Biz, with 755 people.