Schwarzberghorn, Mountain summit in Pennine Alps, Switzerland.

Schwarzberghorn (Italian: Corno Nero) is a summit of the Pennine Alps on the Swiss-Italian border, reaching 3,609 metres. Its peak is the tripoint of the Mattertal and Saastal valleys in Valais and the Valle Anzasca in Piedmont, and it forms the southernmost point of the Mischabel-Strahlhorn chain and the northern end of the Weissgrat.

The mountain marks the southern end of the Mischabel-Strahlhorn chain and has long served as a natural boundary between Switzerland's Valais region and Italy's Piedmont. This ridge line has defined the border between the two territories for generations.

The mountain carries two names reflecting the linguistic mix of this border area: Schwarzberghorn in German-speaking lands and Corno Nero in Italian-speaking regions. This dual naming is visible on older maps and local signage throughout the region.

The summit lies on the Swiss-Italian border, where the Mattertal, Saastal and Valle Anzasca meet; the Italian side is the Valle Anzasca in Piedmont. Approach from the Valais side and plan for glacier and ridge terrain at high altitude. The Weissgrat runs north from the summit, and the Mischabel-Strahlhorn chain ends here.

The mountain has a prominence of 54 meters above the col at 3,555 meters, making it stand out as a distinct peak within the surrounding mountain mass. On clear days, climbers at the summit can view Lake Mattmark and the network of adjacent Alpine ranges.