| Official Name: | Siru |
| Native Name: | سيرو |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Qom |
| Subdivision Type2: | County |
| Subdivision Name2: | Qom |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Kahak |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Kahak |
| Population As Of: | 2006 |
| Population Total: | 837 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 34.4189°N 50.8925°W |
Siru (Persian: سيرو, also Romanized as Sīrū) is a village in Kahak Rural District, Kahak District, Qom County, Qom Province, Iran. At the 2006 census, its population was 837, in 247 families.