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Alzette River winding through Grund, Luxembourg.jpg
The Alzette winding through Grund, Luxembourg
Origin Thil
Mouth Ettelbruck 49°50′53.5″N 6°6′43″E / 49.848194°N 6.11194°E / 49.848194; 6.11194 (Alzette mouth)Coordinates: 49°50′53.5″N 6°6′43″E / 49.848194°N 6.11194°E / 49.848194; 6.11194 (Alzette mouth)
Progression SauerMoselleRhineNorth Sea
Basin countries France, Belgium, Luxembourg
Length 73 km (45 mi)
Source elevation 305 m (1,001 ft)
River system Rhine
Left tributaries Mess, Pétrusse, Eisch, Attert, Wark

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.

The Sauer is a tributary to the Moselle.