贝亚赛恩（西班牙语：Beasain），是西班牙巴斯克自治区基普斯夸省的一个市镇。总面积30平方公里，总人口12108人（2001年），人口密度404人/平方公里。

Beasain is a town and municipality located in the Goierri region of the province of Gipuzkoa, in the Autonomous Community of the Basque Country, northern Spain. It has an important industry of railroad vehicles and related equipment (CAF) that exports its production around the World.