A glacial horn (or, if unambiguous from context, simply a horn) is a mountain formed by glacial erosion. When three or more glaciers erode cirques into the same bedrock, a typical pyramidal peak remains at the junction of the cirques. That peak is a glacial horn.

The most famous glacial horn is the Matterhorn, in Switzerland. Other notable examples of glacial horns include

• Reynolds Mountain , Glacier National Park, USA
• The Grand Teton, Wyoming, USA