Le Chamossaire, Mountain summit in Vaud, Switzerland

Le Chamossaire is a mountain of the Vaud Alps in the canton of Vaud, reaching 2112 metres. Its upper part is a broken slab of Lower Jurassic limestone with a often spathic texture, resting on Liassic schist, itself over a flysch base forming the western, northern and eastern foundation. The summit is a long pasture slope running down to the Col de Bretaye at 1805 metres.

Le Chamossaire lies on the territory of the municipality of Ollon in the Aigle district of Vaud, above the Ormonts valley. Its summit, at 2,112 metres, is reached from Bretaye (1,805 m) by the Bex–Villars–Bretaye railway and then a chairlift; a second chairlift serves the Petit Chamossaire shoulder to the east. The mountain is part of the Villars-Gryon ski area.

The name Chamossaire comes from the local patois for "mountain of the chamois". From the summit, called the "Rigi vaudois" after the Swiss viewpoint mountain, walkers look out over the Dents du Midi, the Mont Blanc massif, the Diablerets and, through the Pas de Cheville, the Weisshorn.

The quickest route involves taking the railway to Villars-sur-Ollon followed by a chairlift to the summit, though marked hiking paths offer alternative approaches. Sturdy footwear and basic mountain preparation are advisable, particularly if you plan to spend time exploring the area.

This peak attracts paraglider pilots who launch from the summit to catch thermal currents and fly across broad stretches of the surrounding landscape. This activity introduces a different way of experiencing the mountain that many ground-based visitors overlook.