| Official Name: | Roein |
| Native Name: | رويين |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | North Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Esfarayen |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Ruin |
| Population As Of: | 2006 |
| Population Total: | 2,604 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.2042°N 57.4867°W |
Ruin (Persian: رويين, also Romanized as Rū’īn) is a village in Ruin Rural District, in the Central District of Esfarayen County, North Khorasan Province, Iran. At the 2006 census, its population was 2,604, in 783 families.
The dominant language in the village is Tati.[1]