Breteuil (French pronunciation: [bʁətœj]), also known as Breteuil-sur-Iton ("Breteuil-on-Iton"), is a commune in the Eure department in Normandy in northern France.

On 1 January 2016, the former communes Cintray and La Guéroulde were merged into Breteuil.

[3] During the Middle Ages, Breteuil was the seat of a lordship in the duchy of Normandy.

His son William of Breteuil served as a Benedictine abbot before inheriting Breteuil and was later canonized as a saint by the Roman Catholic Church.

His illegitimate son Eustace of Breteuil married Juliane de Fontevrault, the illegitimate daughter of King Henry I of England, who feuded with her father and eventually lost control of the lordship.