阿尔泽特河（卢森堡语：Alzette）位于法国和卢森堡境内，发源于法国默尔特-摩泽尔省蒂尔，最终在卢森堡埃特尔布吕克附近注入绍尔河，全长73公里。

阿尔泽特河流经的主要城镇有：阿尔泽特河畔埃施、卢森堡城和梅尔施。

The Alzette (Luxembourgish:Uelzecht, German:Alzig) is a river with a length of 73 kilometres (45 mi) in France and Luxembourg. It is a right tributary of the Sauer.

It rises in Thil near the town Villerupt in the Meurthe-et-Moselle département, France. It crosses the border with Luxembourg after a few kilometres. At Lameschmillen (near Bergem) it is joined by the Mess. It flows through the Luxembourgish towns Esch-sur-Alzette, Luxembourg City and Mersch, and empties into the Sauer near Ettelbruck.