The Scex Rouge (also spelled Sex Rouge; lit. red rock; 2,971 m) is a mountain of the Alps, overlooking Les Diablerets in the canton of Vaud. Along with the Oldenhorn to the east, it is one of the main peaks of the Diablerets, a huge ice-covered mountain near the western end of the Bernese Alps, straddling the border between the cantons of Vaud, Valais and Bern, and exceeding 3,000 metres above sea level. On its west side, the Scex Rouge is part of a nearly 2,000 metre-high amphitheatre of cliffs surrounding the Creux de Champ valley, south of Les Diablerets. On its southeast side, the Scex Rouge overlooks the Tsanfleuron Glacier, the largest in the massif. Administratively, the mountain is part of the municipality of Ormont-Dessus, which also includes Les Diablerets.