Gascony (; French: Gascogne [ɡaskɔɲ]; Occitan: Gasconha [ɡasˈkuɲɔ]; Basque: Gaskoinia) was a province of the southwestern Kingdom of France that succeeded the Duchy of Gascony (602–1453). From the 17th century until the French Revolution (1789–1799), it was part of the combined Province of Guyenne and Gascony. The region is vaguely defined, and the distinction between Guyenne and Gascony is unclear; by some they are seen to overlap, while others consider Gascony a part of Guyenne. Most definitions put Gascony east and south of Bordeaux.

It is currently divided between the region of Nouvelle-Aquitaine (departments of Landes, Pyrénées-Atlantiques, southwestern Gironde, and southern Lot-et-Garonne) and the region of Occitanie (departments of Gers, Hautes-Pyrénées, southwestern Tarn-et-Garonne, and western Haute-Garonne).

Gascony was historically inhabited by Basque-related people who appear to have spoken a language similar to Basque. The name Gascony comes from the same root as the word Basque (see Wasconia below). From the Middle Ages until today, the Gascon language has been spoken, although it is classified as a regional variant of the Occitan language.

Gascony is the land of d'Artagnan, who inspired Alexandre Dumas's character d'Artagnan in The Three Musketeers, as well as the land of Cyrano de Bergerac, the eponymous character of the play by Edmond Rostand. It is also home to Henry III of Navarre, who later became king of France as Henry IV.