Lenzer Horn, Mountain cross in Plessur Alps, Switzerland.

Lenzer Horn is a 2,906-metre rock-and-scree pyramid in the Plessur Alps, the range's second-highest summit after the Aroser Rothorn. Three main ridges shape it: the northwest ridge rising from the forests east of Lenzerheide, the northeast ridge dropping to Piz Mosch, and the south ridge linking to Piz Linard. Its flanks are stepped rock broken by bands of loose stone, with dark coniferous forest below and pale scree channels running down the lower slopes.

The Lenzerhorn's documented climbing history centres on its three main ridges: the northwest ridge rising from the forests east of Lenzerheide, the northeast ridge dropping to the Piz Mosch, and the south ridge linking it to the Piz Linard. The northwest ridge from Lenzerheide via Alp Sanaspans (2,050 m) is the normal route, graded T5/L and marked white-blue-white as an alpine route, taking about four hours. The northeast ridge from Piz Mosch is graded BG and takes about 1½ hours.

The mountain's name appears in two forms, Lenzer Horn and Lenzerhorn, and it is also known as 倫策山 in Chinese. The summit cross is a landmark for hikers, and the peak is a destination for alpine climbing, with routes graded T5/L and BG.

The normal route starts at Lenzerheide (1,473 m) and passes Alp Sanaspans (2,050 m) before gaining the northwest ridge. It is graded T5/L and marked white-blue-white as an alpine route; only the section up to Alp Sanaspans is a white-red-white hiking trail. Allow about four hours, and expect easy rock scrambling on the summit rise.

On clear days, hikers can see as far as Dom in the Walliser Alps and Piz Kesch from the top. These distant views make the climb especially rewarding for those who reach the summit.