| Official Name: | Rudbar |
| Native Name: | رودبار |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Semnan |
| Subdivision Type2: | County |
| Subdivision Name2: | Mehdishahr |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Shahmirzad |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Chashm |
| Population As Of: | 2006 |
| Population Total: | 213 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 35.8908°N 53.1411°W |
Rudbar (Persian: رودبار, also Romanized as Rūdbār) is a village in Chashm Rural District, Shahmirzad District, Mehdishahr County, Semnan Province, Iran. As of the 2006 census, its population was 213, in 52 families.