Waldhorn, Alpine summit in Schladminger Tauern, Austria.

Waldhorn is a 2,702 m peak on the Alpine divide in the Schladminger Tauern, on the border between Salzburg and Styria. Its defining feature is a broad north ridge about 1.5 km long that drops in steep rock walls to both east and west, separating the Klafferkessel and Lämmerkar cirques from the Sonntagskar. The easiest ascent runs from the Preintalerhütte through the Lämmerkar to the Waldhorntörl, then over the west ridge and south ridge to the top.

Waldhorn lies on the main Alpine ridge on the border between Salzburg and Styria. The Austrian surveyors Clem Clements, Jonathan de Ferranti, Eberhard Jurgalski and Mark Trengove list it among Austria's 2500 m summits; the first ascent is recorded for 1878. Its north-east and east slopes held the Waldhorngletscher, a small glacier formed in cold phases around 1600 and 1850 that lasted until the 1970s.

The name Waldhorn combines German Wald (forest) and Horn (horn), describing the peak's pointed shape. The normal route starts at the Preintalerhütte and climbs through the Lämmerkar to the Waldhorntörl, then over the west ridge and an exposed rock nose into the south flank. The crossing to the Kieseck (2681 m) and back through the Sonntagskar is reserved for experienced mountain hikers.

The easiest ascent starts at the Preintalerhütte and leads through the Lämmerkar over steep scree to the Waldhorntörl west of the summit, then over the west ridge, an exposed rock nose and the south ridge to the top. The traverse to the Kieseck (2681 m) with return through the Sonntagskar is only for experienced mountain hikers.

The Waldhorn's north-east and east slopes held a small glacier, the Waldhorngletscher, formed during the Little Ice Age cold phases around 1600 and 1850. At its maximum it was about 350 metres long with ice up to 30 metres thick. Two terminal moraines from the Fernau stage (around 1600) and the 1840/50 high stand remain visible; ice remnants persisted into the 1970s and the glacier largely melted in the 1980s.