贝阿恩（法语：Béarn [be.aʁn]，奥克西唐语贝阿恩方言：Bearn [beˈar] 或 Biarn ['bjar]，巴斯克语：Biarno）是法国的旧省份，位于法国西南，比利牛斯山脚下。它与索尔、拉布尔和下纳瓦拉共同构成法国的比利牛斯-大西洋省（北巴斯克），其中贝阿恩占该省面积的3/5。贝阿恩地区人口约35万。首府是波城。

Béarn (French pronunciation: ​[be.aʁn]; Gascon: Bearn or Biarn; Basque:Bearno or Biarno) is one of the traditional provinces of France, located in the Pyrenees mountains and in the plain at their feet, in southwest France. Along with the three Basque provinces of Soule, Lower Navarre, and Labourd, the principality of Bidache, as well as small parts of Gascony, it forms in the southwest the current département of Pyrénées-Atlantiques (64). The capitals of Béarn were Beneharnum (until 841), Morlaàs (from ca. 1100), Orthez (from the second half of the 13th century), then Pau (beginning in the mid-15th century).