Colmar-Berg (Luxembourgish: Colmer-Bierg, German: Colmar-Berg) is a commune and town in central Luxembourg, in the canton of Mersch.

It is situated at the confluence of the rivers Attert and Alzette.

Colmar-Berg is the site of the Grand Duke of Luxembourg's principal residence, Berg Castle.

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This article related to the geography of Mersch canton is a stub.