| Type: | municipality |
| Official Name: | Yésero (Spanish) |
| Native Name: | Yesero (Aragonese) |
| Area Total Km2: | 30 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Yésero (in Aragonese: Yesero) is a municipality located in the province of Huesca, Aragon, Spain. According to the 2004 census (INE), it has a population of 77 inhabitants.