Mal Khast () is a village in Poshtkuh Rural District of Chahardangeh District in Sari County, Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population was 332 in 81 households. The following census in 2011 counted 335 people in 101 households. The 2016 census measured the population of the village as 339 people in 107 households.