III. Hornspitze, Alpine summit in Zillertal Alps, Austria

III. Hornspitze is a 3,254-metre summit on the Hornrücken, a 2.5-kilometre side ridge of the Zillertal Alps main chain. It is the highest of the Hornspitzen and lies just north of the Austrian-Italian border. Its jagged grey-brown rock face carries snow and ice, with unbroken snowfields on the lower slopes. The ridge separates the Hornkees and Schwarzensteinkees glaciers.

The III. Hornspitze was first climbed in 1874 by the mountain guide Stefan Kirchler and the doctor Josef Daimer with his brother Karl, both from Sand in Taufers. From the 1880s the name "Berliner Spitze" was used by guides working around the Berliner Hütte, though it was disputed for fear of Prussian dominance.

The nearby Berliner Hütte represents traditional Alpine shelter design and serves climbers as a gathering point before attempting the summit. Such refuges anchor the mountaineering community, where climbers prepare, rest, and share knowledge about local conditions.

The climbing season runs from summer into early autumn when glacier conditions are most stable and daylight extends longer. Proper equipment including ice axes, crampons, and rope systems is essential, alongside fundamental skills in glacier and rock climbing to safely navigate the route.

The III. Hornspitze is also called Berliner Spitze, a name used since the 1880s by guides working around the Berliner Hütte; it was never uncontested, as people feared Prussian dominance. The Hornrücken ridge it crowns runs about 2.5 km from the Zemmgrund and separates the Hornkees and Schwarzensteinkees glaciers.