Erzhorn, Mountain in the Plessur Alps, Grisons, Switzerland

Erzhorn is a 2924 m peak in the Plessur Alps of Grisons, Switzerland, the second-highest summit of the range after the neighbouring Aroser Rothorn. It is the westernmost and highest of a line of dolomite summits on the ridge linking the Aroser Rothorn with the Schafrügg, on the boundary between Arosa and Albula/Alvra. Its twin-peaked form, visible from Arosa, has earned it the unofficial role of the commune's heraldic mountain.

Iron ore mines operated on its slopes during the Middle Ages, shaping local economic activity. Early climbers and miners explored the area for centuries, though precise records of the first ascents remain unrecorded.

The name Erzhorn reflects the region's iron mining heritage. The monumental cross at the summit serves as a symbol of faith and mountain culture, and hikers often stop here to rest and take in the views.

The mountain can be reached by several marked trails, some steep and demanding. Start early in the day, bring proper hiking equipment, and be prepared for rapid weather changes in the alpine environment.

The Erzhorn's double-peaked outline, clearly visible from Arosa, gives it the unofficial status of the municipality's heraldic mountain. A local legend, the tale of the Wunschhöhle (wishing cave) near Arosa, is set on this mountain. Its north face was first climbed directly on 16 April 1902 by Lieutenant Erbgraf Waldbott von Bassenheim with the chamois hunter Andreas Rüedi.