William Edington was an English bishop and administrator. He served as Bishop of Winchester from 1346 until his death, Keeper of the wardrobe from 1341 to 1344, treasurer from 1344 to 1356, and finally as chancellor from 1356 until he retired from royal administration in 1363. Edington's reforms of the administration – in particular of royal finances – had wide-ranging consequences and contributed to the English military efficiency in the early stages of the Hundred Years' War. As Bishop of Winchester, he was responsible for starting an extensive rebuilding of Winchester Cathedral, and for founding Edington Priory, the church of which still stands today.

The King's Wardrobe, together with the Chamber, made up the personal part of medieval English government known as the King's household. Originally the room where the king's clothes, armour, and treasure were stored, the term was expanded to describe both its contents and the department of clerks who ran it. Early in the reign of Henry III the Wardrobe emerged out of the fragmentation of the Curia Regis to become the chief administrative and accounting department of the Household. The Wardrobe received regular block grants from the Exchequer for much of its history; in addition, however, the wardrobe treasure of gold and jewels enabled the king to make secret and rapid payments to fund his diplomatic and military operations, and for a time, in the 13th-14th centuries, it eclipsed the Exchequer as the chief spending department of central government.