| Official Name: | Kelasmadin-e Yek |
| Native Name: | كلاسمدين يك |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Khuzestan |
| Subdivision Type2: | County |
| Subdivision Name2: | Bagh-e Malek |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Rud Zard |
| Population As Of: | 2006 |
| Population Total: | 23 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 31.4983°N 49.7639°W |
Kelasmadin-e Yek (Persian: كلاسمدين يك, also Romanized as Kelāsmadīn-e Yek) is a village in Rud Zard Rural District, in the Central District of Bagh-e Malek County, Khuzestan Province, Iran. At the 2006 census, its population was 23, in 7 families.