The Hornungskuppe (called the Hornsberg in the Middle Ages) is a wooded hill, 439 m above sea level (NHN), in the Thuringian Zipfel on the border of Hesse and Thuringia in Germany.

The Hornsberg was mentioned in documents dating to the 12th century in connexion with the eponymous noble family.

[1] The border between the two German states runs over the hill.

The fenced in terrain on which the spoil tip of Monte Kali stands begins on its western slopes.

Barely 500 metres to the northeast on a spur of the Hornungskuppe stands Hornsberg Castle.