Blankenheim is a municipality in the district of Euskirchen in the state of North Rhine-Westphalia, Germany.
Blankenheim is located in the Eifel hills, approx. 27 km south-west of Euskirchen. The river Ahr has its source in the centre of Blankenheim, in the cellar of a half timbered house.
In the year 721 Blankenheim is mentioned for the first time as "Blancio" in a document. Today the municipality is called in Eifel dialect as "Blangem" and has got a long carnival tradition.