| Official Name: | Sisab |
| Native Name: | سيساب |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | North Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Bojnord |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Garmkhan |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Garmkhan |
| Population As Of: | 2006 |
| Population Total: | 572 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.4558°N 57.6567°W |
Sisab (Persian: سيساب, also Romanized as Sīsāb) is a village in Garmkhan Rural District, Garmkhan District, Bojnord County, North Khorasan Province, Iran. At the 2006 census, its population was 572, in 142 families.