The Dehnenkopf in the Harz Mountains of central Germany is a summit about 775 m above sea level (NN)[1] near Torfhaus in the unincorporated area of Harz in the county of Goslar in Lower Saxony.

The Dehnenkopf rises about 1.1 km west-northwest of Torfhaus, a village in the mining borough of Altenau.

On the north flank of the Dehnenkopf rise two tributaries of the River Oker: the Kalbe and the Kellerwasser, which flows through the valley of Kellwassertal.

Around 500 metres northeast of the summit runs the B 4 federal road, from which the Landesstraße 504 branches off in Torfhaus heading roughly westwards as the Steile-Wand-Straße to Altenau.

The checkpoint box is located a few metres east of the tor on a gravelled forest track and hiking trail, which runs gently downhill towards the southeast to near the beginning of the Dammgraben, a water channel that is part of the Upper Harz Water Regale.