别尔萨（西班牙语：Bielsa），是西班牙阿拉贡自治区韦斯卡省的一个市镇。总面积202平方公里，总人口456人（2001年），人口密度2人/平方公里。

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.