Pessac-Léognan is a wine growing area and Appellation d'Origine Contrôlée, in the northern part of the Graves region of Bordeaux. Unlike most Bordeaux appellations, Pessac-Léognan is equally famous for both red and (dry) white wines, although red wine is still predominant.It includes the only red-wine producer outside the Haut-Médoc classified in the Bordeaux Wine Official Classification of 1855, the premier cru Château Haut-Brion, and also includes all of the châteaux listed in the 1953/59 classification of Graves. These classed growths account for a third of the wine produced in Pessac-Léognan.

Pessac-Léognan has a long wine-making history. Red wine from this region (and the rest of Graves) was the wine originally loved by the English as claret, during the 300 years that Aquitaine was under English rule, from 1152 to 1453. The area includes the oldest named property in Bordeaux, Château Pape Clément, founded by Pope Clement V in 1306. In the mid-seventeenth century, Château Haut-Brion became the first château of international renown, being praised by Samuel Pepys in 1663, while the Médoc was still swamp.However, the appellation of Pessac-Léognan is relatively recent, dating to 1987. Before then, the area was part of the Graves AOC, and known informally as Haut-Graves.