Nideggen is a town in the district of Düren in the state of North Rhine-Westphalia, Germany. It is located on the river Rur, in the Eifel hills, approx. 15 km south of Düren.
Nideggen is known for its ruined, but partly restored castle (Burg Nideggen) and the sandstone rocks along the Rur. It is twinned with Thatcham in Berkshire, England. The first mention in history was in 1184.