| Official Name: | Zeyn ol Din |
| Native Name: | زين الدين |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Fars |
| Subdivision Type2: | County |
| Subdivision Name2: | Eqlid |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Sedeh |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Aspas |
| Population As Of: | 2006 |
| Population Total: | 91 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 30.5933°N 52.3097°W |
Zeyn ol Din (fa|زين الدين, also Romanized as Zeyn ol Dīn, Zeyn Ed Dīn, and Zeyn od Dīn; also known as Amīr Zeyn od Dīn and Shahrak-e Zeyn od Dīn) is a village in Aspas Rural District, Sedeh District, Eqlid County, Fars Province, Iran. At the 2006 census, its population was 91, in 16 families.