The Viscounty and County of Avranches was a medieval viscounty and county in the Duchy of Normandy in France centered on the town of Avranches and located in the area of the Avranchin, disputed between France and England during parts of the Hundred Years' War. A choice landholding, granted to a noble in return for service and favor.

The following are the holders of the title by right, by virtue of inheritance under the salic law, even if some of them did not make use of it: