| Official Name: | Robat-e Aghaj |
| Native Name: | رباطاغاج |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Markazi |
| Subdivision Type2: | County |
| Subdivision Name2: | Khomeyn |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Hamzehlu |
| Population As Of: | 2006 |
| Population Total: | 120 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 33.8211°N 50.1017°W |
Robat-e Aghaj (Persian: رباطاغاج, also Romanized as Robāţ-e Āghāj and Robat Aghaj) is a village in Hamzehlu Rural District, in the Central District of Khomeyn County, Markazi Province, Iran. At the 2006 census, its population was 120, in 36 families.