阿登（荷兰语：Ardennen，英语发音：/ɑrˈdɛn/；英语：Ardennes），也译作亚尔丁（法语：Ardenne）是位于比利时和卢森堡交界的一片森林覆盖的丘陵地带，并一直延伸到法国境内。

1940年5月13日德国A集团军通过法国防守力量薄弱的阿登，越过马奇诺防线进入法国，盟军在阿登山地因为德军的奇袭完全无法组织有效的抵抗。

1944年12月16日，由于战局对德国逐渐不利，以及东线红军的压迫，希特勒遂下令发动“守望莱茵”（美方称之为突出部之役）之战，就在这同样的地方发起。

The Ardennes (/ɑːrˈdɛn/; Luxembourgish:Ardennen; also known as Ardennes Forest) is a region of extensive forests, rough terrain, rolling hills and ridges formed by the geological features of the Ardennes mountain range and the Moselle and Meuse River basins. Geologically, the range is a western extension of the Eifel and both were raised during the Givetian stage of the Devonian (419.2 ± 3.2 to about 358 million years ago) as were several other named ranges of the same greater range.