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.

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.

This article about a location in the Province of Huesca is a stub.