Grand Combin, Alpine summit in Pennine Alps, Valais, Switzerland

Grand Combin is a glaciated massif in the western Pennine Alps, in Valais, Switzerland. Its highest summit, Combin de Grafeneire, reaches 4,309 m; Combin de Valsorey (4,184 m) and Combin de la Tsessette (4,132 m) also exceed 4,000 m. The massif is built mainly of gneiss, and its north-western face is covered by eternal snow and glaciers.

Gottlieb Samuel Studer first reached the Combin de Corbassière on 14 August 1851. The Aiguille du Croissant was climbed in 1857, and the main summit, Combin de Grafeneire, was first ascended on 30 July 1859 by Charles Sainte-Claire Deville with Daniel, Emmanuel and Gaspard Balleys and Basile Dorsaz. The Panossière Hut, built in 1881 at 2,770 m, eased access from the Corbassière valley.

The massif's name comes from the Latin culmen, meaning summit. Since the 19th century its glaciers and gneiss have drawn members of the Swiss Alpine Club, which built the Cabane de Panossière in 1881 at 2,770 m on the eastern edge of the Corbassière Glacier. Today the mountain is a stage of the Haute Route from Chamonix to Zermatt and is circled by the multi-day Tour des Combins.

The climbing season runs from July to September when conditions are most stable and daylight is longest. Most routes involve early morning starts and require good physical fitness and acclimatization.

The Corbassière Glacier runs about ten kilometres north from the massif's high plateau, and the Panossière Hut (2,641 m) stands beside it on the north side. The hut, built by the Swiss Alpine Club in 1881 at 2,770 m on the glacier's eastern edge, was later replaced at its present site and serves climbers on the normal route.