Gaston de Foix, duc de Nemours (December 10, 1489 – April 11, 1512), also known as The Thunderbolt of Italy is a French military commander noted mostly for his brilliant six-month campaign from 1511 to 1512 during the War of the League of Cambrai.

Born in Mazères, County of Foix, he is the second child but only son of John of Foix, Viscount of Narbonne and Marie d'Orléans.

His older sister is Germaine of Foix, Queen consort of Aragon as the second wife of Ferdinand II.

His paternal grandparents are Gaston IV of Foix-Grailly and Queen regnant Eleanor of Navarre.

His maternal grandparents are Charles, Duke of Orléans and Marie of Cleves.

His only maternal uncle is Louis XII of France.