Châtaigne d'Ardéche are sweet chestnuts of the ancient local varieties of Castanea sativa Miller grown and harvested in the Ardéche, the largest chestnut-producing region in France, with an annual Chestnut Festival and even a Chestnut museum in the medieval town of Joyeuse.

They can be used for making chestnut flour, or may come as fresh unpeeled chestnuts or peeled dry chestnuts. The taste is uniquely sweet, with aromas of pastry, sweet potatoes, honey, onion squash and pain au lait. For dried chestnuts, there are aromas of nuts, almonds, hazelnuts, and cake, sometimes accompanied by a slightly bitter flavor.

They are regularly used in candied chestnut purée, liqueurs, cakes, soups (known as Cousina), jams or in chestnut flour bread.