Robert de Longvilliers de Poincy (or Lonvilliers; 1611 – 1 April 1666) was a French local governor of Saint Christophe and Saint Martin in the French Antilles.His uncle, Phillippe de Longvilliers de Poincy, was commander of the French colonies in the Antilles from 1639 to 1651, then commander of the colonies of Saint Christophe, Saint Croix, Saint Barthélemy, and Saint Martin for the Knights of Malta. Longvilliers reestablished French control of the northern part of Saint Martin after the Spanish withdrew and the Dutch tried to take over the whole island.