| Official Name: | Sari Su |
| Native Name: | ساري سو |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | West Azerbaijan |
| Subdivision Type2: | County |
| Subdivision Name2: | Poldasht |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Chaybasar-e Sharqi |
| Population As Of: | 2006 |
| Population Total: | 234 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 39.3364°N 44.93°W |
Sari Su (Persian: ساري سو, also Romanized as Sārī Sū; also known as Sarasu) is a village in Chaybasar-e Sharqi Rural District, in the Central District of Poldasht County, West Azerbaijan Province, Iran. At the 2006 census, its population was 234, in 42 families.