| Bielsa | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Aragón |
| Subdivision Type2: | Province |
| Subdivision Name2: | Huesca |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Sobrarbe |
| Coordinates: | 42.6333°N 0.2167°W |
| Elevation M: | 1053 |
| Area Total Km2: | 202.41 |
| Population Demonym: | Belsetán |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 22350 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | Antonio Escalona Estévez (2007) |
| Leader Party: | PSOE |
Bielsa is a municipality located in the province of Huesca, Aragon, Spain. According to the 2004 census (INE), the municipality has a population of 463 inhabitants.
The Bielsa tunnel under the Pyrenean mountains connects Bielsa and Aragnouet in France. It was first opened in 1970. In 2002, the French government unilaterally decided to close the tunnel to heavy-goods vehicles over 3.5 tonnes, a decision which caused serious concern in Aragon.[1]