| Official Name: | Kayin |
| Native Name: | كايين |
| Settlement Type: | village |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kerman |
| Subdivision Type2: | County |
| Subdivision Name2: | Jiroft |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Sarduiyeh |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Gevar |
| Population As Of: | 2006 |
| Population Total: | 43 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
Kayin (Persian: كايين, also Romanized as Kāyīn) is a village in Gevar Rural District, Sarduiyeh District, Jiroft County, Kerman Province, Iran. At the 2006 census, its population was 43, in 8 families.