| Official Name: | Pain Serest |
| Native Name: | پايين سرست |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mazandaran |
| Subdivision Type2: | County |
| Subdivision Name2: | Babol |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Gatab |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Gatab-e Shomali |
| Population As Of: | 2006 |
| Population Total: | 366 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 36.4558°N 52.6728°W |
Pain Serest (Persian: پايين سرست, also Romanized as Pā’īn Serest; also known as Pā’īn Sar Rost) is a village in Gatab-e Shomali Rural District, Gatab District, Babol County, Mazandaran Province, Iran. At the 2006 census, its population was 366, in 87 families.