| Official Name: | Ghias ol Din |
| Native Name: | غياث الدين |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Sarbisheh |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Mud |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Mud |
| Population As Of: | 2006 |
| Population Total: | 33 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 32.6689°N 59.4742°W |
Ghias ol Din (fa|غياث الدين, also Romanized as Ghīās̄ ol Dīn, Ghīās̄ od Dīn, and Ghīās̄ ed Dīn) is a village in Mud Rural District, Mud District, Sarbisheh County, South Khorasan Province, Iran. At the 2006 census, its population was 33, in 9 families.