Besh Aghaj () is a village in Dughayi Rural District of Abkuh District in Quchan County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 351 in 97 households, when it was in the Central District. The following census in 2011 counted 234 people in 87 households. The 2016 census measured the population of the village as 250 people in 100 households.
In 2020, the rural district was separated from the district in the formation of Abkuh District.