Gratin dauphinois (/ˈɡræt.æ̃ ˌdoʊ.fɪˈnwɑː/ GRAT-a doh-fi-NWAH) is a French gratin of sliced raw potatoes baked in cream, from the Dauphiné region in south-eastern France.

It was served with ortolans at a dinner given by Charles-Henri, Duke of Clermont-Tonnerre and Lieutenant-general of the Dauphiné, for the municipal officials of the town of Gap, now in the département of Hautes-Alpes.

[2]: 242 Gratin dauphinois is made with thinly sliced raw potatoes and cream, cooked in a buttered dish rubbed with garlic; cheese is sometimes added.

The potatoes are peeled and sliced to the thickness of a coin, usually with a mandoline; they are layered in a shallow earthenware or glass baking dish and cooked in a slow oven; the heat is raised for the last 10 minutes of the cooking time.

[7]: 263  Recipes given by many chefs – including Auguste Escoffier, Austin de Croze and Constance Spry – call for cheese and eggs;[3]: 251 [8]: 725 [9]: 207  others such as Robert Carrier specify cheese but no egg.