'Esch on Sûre'; Luxembourgish: Esch-Sauer, pronounced [ˌæʃˈzɑʊɐ] ⓘ; German: Esch-Sauer, pronounced [ˌɛʃˈzaʊɐ]) is a commune and small town in north-western Luxembourg, situated in the canton of Wiltz.

At one point it was the second smallest commune by area in Luxembourg (after Remich), until Neunhausen and Heiderscheid were merged into it in 2011.

[1] As of 2023[update], the town of Esch-sur-Sûre, which lies in the north of the commune, has a population of 402.

Immediately above the town, the river has been dammed to form a hydroelectric reservoir extending some 6 miles (10 km) up the valley.

The Upper Sauer dam was built in the 1960s to meet the country's drinking water needs.