Dürrenhorn, Mountain summit in Valais, Switzerland.

Dürrenhorn is a 4,035-metre summit in the Mischabel range of the Pennine Alps, Switzerland. It lies towards the northern end of the Nadelgrat, a high ridge running roughly north–south above Saas-Fee to the east and the Mattertal to the west. Just north of the summit stands the sub-peak Klein Dürrenhorn (3,889 m).

The first ascent took place on September 7, 1879, when climbers Mummery, Penhall, Burgener, and Imseng reached the top. This achievement was part of the broader exploration of the Nadelgrat ridge during the mountaineering era of the 1800s.

The Dürrenhorn is also called Dirruhorn, and the neighbouring sub-peak north of it is the Klein Dürrenhorn (Chli Dirruhorn, 3,890 m). The German name is the one used in the Swiss sources; the sources give no dialect etymology for it.

Climbing this peak requires rock climbing skills and proper mountaineering gear including ropes, crampons, and a helmet. The best climbing window runs from June through September when snow cover is lighter and weather conditions are more stable.

The summit connects directly to Lenzspitze, Nadelhorn, Stecknadelhorn, and Hobärghorn as a single continuous ridge traverse. Experienced climbers often combine all five peaks into one long day, making this route popular for mountaineers seeking a full ridge challenge.