Saint-Vaast-la-Hougue is a commune in the Manche department in Normandy in north-western France. It is particularly known for being a major site of fortifications designed by Sébastien Le Prestre de Vauban: the watchtowers of Tatihou and La Hougue having been listed in 2008 as part of the Fortifications of Vauban UNESCO World Heritage Sites.