Pierre Louis Maupertuis (1698–1759) was a French mathematician and philosopher. Maupertuis may also refer to: Maupertuis Bay, a bay on Kangaroo Island in South Australia Maupertuis (crater), a lunar crater (named after Pierre Louis Maupertuis) Maupertuis' principle, a formulation of the principle of least action Maupertuis, Manche, a commune in Manche, France Maupertus-sur-Mer, a commune in Manche, France Nouaillé-Maupertuis, near the site of the 1356 Battle of Poitiers and occasionally lending its name to that battle Maleperduis, Malperduys or Maupertuis, the fictional lair of Reynard the Fox See also Malpertuis, a horror novel by the Belgian author Jean Ray