Quettehou ([ketu] or [kɛtu]) is a commune in the Manche department in north-western France.

On 1 January 2019, the former commune Morsalines was merged into Quettehou.

[3] The town of Quettehou is located at the North-East tip of the peninsula of Cotentin in an area called Val de Saire, the vale of the river Saire.

The creation of Quettehou dates back to the Viking invasions when Ketil, chief of a Viking tribe, decided to settle at the top of the hill dominating the bay of Morsalines.

The Black Prince was knighted in the local church by his father, King Edward III of England, on 12 July 1346, prior to the Battle of Crécy.