Kuh Sakht () is a village in Sarvelayat Rural District of Sarvelayat District in Nishapur County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 754 in 195 households. The following census in 2011 counted 622 people in 197 households. The 2016 census measured the population of the village as 565 people in 205 households.