Agassizhorn, Mountain summit in Bernese Alps, Switzerland

The Agassizhorn is a 3,947 m summit in the Bernese Alps, less than 1.5 km from the Finsteraarhorn and separated from it by the Agassizjoch (3,747 m). Three steep flanks are divided by sharp ridges: the Fieschergrat runs about 3 km west to the Kleines Fiescherhorn, a roughly 500 m north wall drops to the Oberes Ischmeer, and the south-west flank is snow- and ice-covered up to the summit.

The peak was named after Louis Agassiz, a 19th century Swiss geologist who conducted major research on glacier movement and ice age periods. His work in this region significantly advanced the understanding of how glaciers form and change over time.

From 2007, Louis Agassiz's role as a race theorist was debated, and a proposal was made to rename the mountain Rentyhorn after Renty, the Congolese enslaved man Agassiz had photographed and studied in South Carolina. In 2020 the three municipalities Guttannen, Grindelwald and Fieschertal rejected the renaming.

Reaching this summit requires serious mountaineering experience and proper equipment, as weather at this elevation shifts rapidly and unpredictably throughout the day. Visitors should prepare for harsh conditions and only attempt the route when weather is stable.

The summit marks a continental divide where water flows either northward toward the North Sea or southward toward the Mediterranean. This geographic boundary line makes the location a special point with two opposing drainage directions.