| Official Name: | Isín |
| Settlement Type: | Population unit |
| Coordinates: | 42.5992°N -0.4044°W |
| Population Total: | 5 |
| Population As Of: | 2019 |
| Elevation M: | 1027 |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Aragon |
| Subdivision Type2: | Province |
| Subdivision Name2: | Huesca |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Sabiñánigo |
Isín (Spanish pronunciation: [is'in]) is a locality belonging to the municipality of Sabiñánigo (Alto Gállego, Huesca, Aragon, Spain). In 2019, it had a population of 5 inhabitants.[1] The populated place lies in the valley formed by the, on its right bank,[2] at about 1027 metres above sea level.
A standalone municipality in the 1842 census, it was annexed by Acumuer before the 1857 census.[3]