Colmar-Berg (German pronunciation: [ˈkɔlmaʁ ˈbɛʁk]; Luxembourgish: Colmer-Bierg) is a commune in central Luxembourg, in the canton of Mersch. It comprises the localities of Colmar and Berg, situated on either bank of the river Attert, as well as Welsdorf.
Colmar-Berg is the site of the Grand Duke of Luxembourg's principal residence, Berg Castle. It is also the site of a Goodyear tyre factory.