Kuhestan Rural District () is in Marzanabad District of Chalus County, Mazandaran province, Iran. Its capital is the village of Tuvir.
At the time of the 2006 National Census, the rural district's population (as a part of the former Kelardasht District) was 5,147 in 1,396 households. There were 5,516 inhabitants in 1,720 households at the following census of 2011, by which time the rural district had been separated from the district in the formation of Marzanabad District. The 2016 census measured the population of the rural district as 6,942 in 2,554 households. The most populous of its 66 villages was Dalir, with 568 people.