Médoc is an AOC for wine in the Bordeaux wine region of southwestern France, on the Left Bank of the Gironde estuary that covers the northern section of the viticultural strip along the Médoc peninsula. The zone is sometimes called Bas-Médoc, though this term is not permitted on any label. With few exceptions there is produced only red wine, and no white wine has the right to be called Médoc.

The Bordeaux Wine Official Classification of 1855 resulted from the 1855 Exposition Universelle de Paris, when Emperor Napoleon III requested a classification system for France's best Bordeaux wines that were to be on display for visitors from around the world. Brokers from the wine industry ranked the wines according to a château's reputation and trading price, which at that time was directly related to quality.