The Weissmies 4,017 m (13,179 ft) is a mountain in the Pennine Alps in the canton of Valais in Switzerland near the village of Saas-Fee. It is the easternmost four-thousander of its range.
The Weissmies is located on the main Alpine chain, on a massif separating the Saastal valley on the west and Simplon valley on the east. The massif consists of two other main summits lying to the north at almost the same altitude, the Lagginhorn and Fletschhorn. The mountain lies between the Lagginjoch (3,500 m) to the north and the Zwischbergen Pass (3,260 m) to the south.
The Weissmies is one of the 10 four-thousanders surrounding the Saastal, facing the Dom on the west, the third highest summit of the Alps.
It was first climbed by Jakob Christian Häusser and Peter Josef Zurbriggen in 1855 via the Triftgrat. The ascent was mired in some controversy as the local guides did not believe that the peak could be ascended without their help; when they themselves ascended to the summit by following Häusser and Zurbriggen's footprints, they found that the highest point had indeed been reached.
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