The Valois (, also , ; originally Pagus Valensis) was a region in the valley of the Oise river in Picardy in the north of France. It was a fief in West Francia and subsequently the Kingdom of France until its counts furnished a line of kings, the House of Valois, to succeed the House of Capet in 1328. It was, along with the counties of Beauvais, the Vexin, Vermandois, and Laon, part of the "Oise line" of fiefdoms which were held often by one individual or an individual family as a string of defences against Viking assault on Paris. The medieval county and duchy of Valois was located in northern France. It was included in the northeastern part of the government of Île-de-France, while being part of the province of Picardy. Its capital was Crépy-en-Valois.

Counts of Valois

Carolingian counts

Counts of disputed origin

Vermandois Carolingian counts

Capetian counts

To the royal domain by king Philip II

Valois counts

Dukes of Valois

Thus the house of Valois is descended from Charles I, and has been divided into several lines, three of which have reigned in France. These are: Other Valois branches are: the dukes of Alençon, descendants of Charles, a younger son of Charles I, count of Valois; the Dukes of Anjou, descendants of Louis, the second son of King John II; and the dukes of Burgundy, descendants of Philip, the fourth son of the same king.