Ansembourg (Luxembourgish: Aansebuerg, German: Ansemburg) is a village in the commune of Helperknapp, in western Luxembourg.
As of 2024[update], the village had a population of 48.
The village is the site of two of the seven castles.
The New Castle of Ansembourg, located about one kilometre or just over half a mile below the Old Castle, was built by the industrialist Thomas Bidart in 1639 and is now known for its more modern finish and its terraced gardens.
This article related to the geography of Mersch canton is a stub.