Nadelhorn, Alpine summit in Pennine Alps, Switzerland.

The Nadelhorn is a 4,327 m summit in the Pennine Alps of Valais, the highest point of the Nadelgrat ridge above Saas-Fee. Its three ridges meet in a small, sharp-pointed top that leaves room for only a few climbers at once. About 10 m north-west of the highest point lies the oval Nadelloch, a hole in the rock visible from the Festijoch and from the south-west ridge of the Ulrichshorn.

The Nadelhorn was first climbed on 16 September 1858 by Franz Andenmatten, Baptiste Epiney, Aloys Supersaxo and Joseph Zimmermann, who took the north-east ridge that remains the normal route today. Their aim was to set up a trigonometric signal on the summit. The Nadelgrat ridge, of which the Nadelhorn is the highest point, was climbed in full later.

The name likely comes from the Nadelloch, an oval opening in the rock about 10 metres north-west of the highest point, visible from the Festijoch and from the south-west ridge of the Ulrichshorn. Seen from the north the sharp summit itself resembles a needle. A related name is the Stecknadelhorn, a little further north-west on the Nadelgrat.

The normal route is the north-east ridge, the line of the 1858 first ascent, and it starts from the Riedgletscher glacier on the firn-covered north flank. The three ridges meet at a small, sharp summit that holds only a few climbers at once. The Nadelhorn is also a possible exit point from the Nadelgrat ridge, which continues south to the Lenzspitze.

The name likely comes not from the pointed shape but from the Nadelloch, an oval opening in the rock about 10 metres northwest of the highest point. It is visible from the Festijoch when climbing the Dom and from the southwest ridge of the Ulrichshorn.