The Alter Stolberg is a wooded karst plateau, up to 357.7 m above sea level (NN), in the South Harz in Central Germany.

The ridge of the Alter Stolberg is part of the South Harz Zechstein belt and lies mainly in Thuringia; with its eastern foothills dropping into the valley of the Krebsbach stream and Thyra river.

To the north is the Harz; to the south the Goldene Aue through which the River Helme flows.

The Alter Stolberg lies between the following parishes in clockwise order: Görsbach and Urbach to the south, Leimbach and Steigerthal to the west, Buchholz and Herrmannsacker to northwest, Stempeda and − on the other sides of that − Rodishain to the north (all in Thuringia) and the Saxony-Anhalt villages of Rottleberode and Uftrungen to the east.

The highest hill in the Alter Stolberg is the Königskopf (357.7 m above sea level (NN)) which rises in the northern part of the ridge.