| Official Name: | Rain |
| Native Name: | رئين |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | North Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Bojnord |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Aladagh |
| Population As Of: | 2006 |
| Population Total: | 917 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.4025°N 57.0331°W |
Rain (Persian: رئين, also Romanized as Ra’īn) is a village in Aladagh Rural District, in the Central District of Bojnord County, North Khorasan Province, Iran. At the 2006 census, its population was 917, in 235 families.