The Butterberg is an elongated hill northeast of the spa town of Bad Harzburg in Goslar district, in the German state of Lower Saxony.

Its long crest, which since 1952 is protected as a nature reserve, reaches a height of 308 m above NN.

The Butterberg is part of the Harz - Brunswick Land - Eastphalia National Geopark; its steeply inclined strata belong to the Northern Harz Boundary Fault.

In the west, the hill is bounded by the Radau river and the parallel Bundesstraße 4 highway.

The mountain-ridge path offers scenic views to the Harz mountains and over the North German Plain.