Normandy or Normandie, region and former province of France, bordering on the English Channel. In area it corresponds approximately to the modern departments of Seine-Maritime, Eure, Orne, Calvados, and Manche; its former capital was Rouen. Normandy is an agricultural region known for its dairy industry.

Under Roman domination the region formed part of Gallia Lugdunensis (Celtic Gaul) (see Roman Empire). With the Frankish invasions it was made a constituent part of the kingdom of Neustria. It came to be known as Normandy about 911, when Charles III, king of France, turned it over to Rollo, the leader of a menacing band of Viking raiders; thereafter, the Vikings in Normandy were known as Normans. In 1066 a descendant of Rollo, William II, duke of Normandy, led an invasion of England and established himself there as William I, king of England. Normandy remained an English possession until conquered in 1204 by Philip II Augustus, king of France. During the Hundred Years' War, the region was held at various times by both French and English forces; it was finally recovered by the French in 1450. The Channel Islands, which were once a part of Normandy, remained in the possession of England.

Normandy was the location of the Allied invasion of German-occupied France during World War II.