Dalheim is a commune and town in south-eastern Luxembourg. It is part of the canton of Remich, which is part of the district of Grevenmacher.
, the town of Dalheim, which lies in the centre of the commune, has a population of 1,232. Other towns within the commune include Filsdorf and Welfrange.
Dalheim is the site of Luxembourg's most important Roman ruins. Known as Dalheim Ricciacum, it is home to an ancient Roman theatre.