Roquefort (AmE [ˈɹɔʊkfɚt], BrE [ɹɒkˈfɔː], French [ʀɔkfɔʀ]; from Occitan ròcafòrt [ˌrrɔkɔˈfɔɾt]) is a sheep milk blue cheese from the south of France, and together with Bleu d'Auvergne, Stilton and Gorgonzola is one of the world's best-known blue cheeses. Though similar cheeses are produced elsewhere, European law dictates that only those cheeses aged in the natural Combalou caves of Roquefort-sur-Soulzon may bear the name Roquefort, as it is a recognised geographical indication, or has a protected designation of origin. Roquefort is sometimes known as the "King of Cheeses", a distinction that is also used for the Italian Parmigiano Reggiano, the French Brie de Meaux & Époisses de Bourgogne, and the English Stilton.
The cheese is white, crumbly and slightly moist, with distinctive veins of green mould. It has characteristic odor and flavor with a notable taste of butyric acid; the green veins provide a sharp tang. The overall flavor sensation begins slightly mild, then waxes sweet, then smoky, and fades to a salty finish. It has no rind; the exterior is edible and slightly salty. A typical wheel of Roquefort weighs between 2.5 and 3 kilograms, and is about 10 cm thick. As each kilogram of finished cheese requires about 4.5 litres of milk, Roquefort is high in fat, protein and minerals, notably calcium.