Ardèche (French pronunciation: [aʁdɛʃ]; Occitan and Arpitan: Ardecha) is a département in the Auvergne-Rhône-Alpes region of south-central France. It is named after the River Ardèche.

The area has been inhabited by humans at least since the Upper Paleolithic, as attested by the famous cave paintings at Chauvet Pont d'Arc. The plateau of the Ardèche river has extensive standing stones (dolmens and menhirs), erected thousands of years ago. The river has the largest canyon in Europe and the caves that dot the cliffs (which go as high as 300 m (1,000 feet)) are known for signs of prehistoric inhabitants (arrowheads and flint knives are often found).

The Vivarais, as the Ardèche is still called, takes its name and coat-of-arms from Viviers, which was the capital of the Gaulish tribe of Helvii, part of Gallia Narbonensis, after the destruction of their previous capital at Alba-la-Romaine. Saint Andéol, a disciple of St Polycarp, is supposed to have evangelized the Vivarais during the reign of Emperor Septimius Severus, and was supposedly martyred in 208. Legend tells of Andéol's burial by Amycia Eucheria Tullia. In 430, Auxonius transferred the see to Viviers as a result of the problems suffered at its previous site in Alba Augusta.

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