| Official Name: | Zeyn ol Dini |
| Native Name: | زين الديني |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Fars |
| Subdivision Type2: | County |
| Subdivision Name2: | Lamerd |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Eshkanan |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Kal |
| Population As Of: | 2006 |
| Population Total: | 227 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 27.1394°N 53.8694°W |
Zeyn ol Dini (Persian: زين الديني, also Romanized as Zeyn ol Dīnī, Zeyn ed Dīnī, and Zeyn od Dīnī; also known as Zainadoni, Zandūnī, Zeinoddin, Zen Dūnī, Zeyn Denī, and Zeyn od Dīn) is a village in Kal Rural District, Eshkanan District, Lamerd County, Fars Province, Iran. At the 2006 census, its population was 227, in 57 families.