Phillippe de Longvilliers de Poincy (French pronunciation: [filip də lɔ̃vilje də pwɛ̃si]; 1584–1660) was a French nobleman and Bailiff Grand Cross of the Knights of Malta. He governed the island of Saint Christopher from 1639 to his death in 1660, first under the Compagnie des Îles de l'Amérique and later under the Knights of Malta themselves. Poincy was the key figure in the Hospitaller colonization of the Americas.
On 12 January 1638 Poincy set sail for the Caribbean on board La Petite Europe On February 20 he took up his commission as Lieutenant Governor of the Isles of America and Captain general of the French at St Kitts. He arrived wearing the regalia of the Knights of St John of Malta and soon dispensed with the authority of the French king, declaring "The people of St Kitts will have no other Governor than Poincy and will take no orders from the King of France."