Fenesk

is a village in Poshtkuh Rural District of Shahmirzad District in Mehdishahr County, Semnan province, Iran.

==Demographics== ===Population=== At the time of the 2006 National Census, the village's population was 24 in seven households, when it was in the former Mehdishahr District of Semnan County. The following census in 2011 counted 153 people in 39 households, by which time the district had been separated from the county in the establishment of Mehdishahr County. The rural district was transferred to the new Shahmirzad District. The 2016 census measured the population of the village as 81 people in 34 households.