Ruin () is a village in Ruin Rural District of the Central District in Esfarayen County, North Khorasan province, Iran.
The dominant language in the village is Tati.
At the time of the 2006 National Census, the village's population was 2,604 in 783 households. The following census in 2011 counted 2,337 people in 801 households. The 2016 census measured the population of the village as 2,123 people in 764 households.