The Unterberghorn (1,773 m (AA)) in the Austrian district of Kitzbühel in Tyrol is the highest peak between the mountain ranges of the Wilder Kaiser and Loferer Steinberge.

The horn or pyramidal peak has two summits - its subpeak is the Hefferthorn (1,735 m) - and is the local mountain (Hausberg) for the villages of Kössen (near the Bavarian border) and St. Johann in Tirol, between which it rises, west of the valley of the River Großache.

Deep troughs also run in both directions, whilst a large area of alpine pasture, the Zellerinalm lies on its eastern flank.

A cable car runs between this ridge and the Unterbergalm (1,278 m), whilst the alm hut is served by a good road and ski lifts cover the entire north slope.

The rivers draining to the north are heavily affected by changing weather conditions that can lead to flooding in the area of Kössen.