Kahnuk Rural District (Persian: دهستان كهنوك) is a rural district (dehestan) in Irandegan District, Khash County, Sistan and Baluchestan province, Iran. At the 2006 census, its population was 8,200, in 1,898 families. The rural district has 105 villages. At the 2016 census, its population was 8,502.