L'AbbéJean Marie Gantois (21 July 1904 - 28 May 1968) was a Catholic priest and Flemish nationalist from northern France. He wrote treatises encouraging French Flemings to think of themselves as Flemings first and Frenchmen second. During World War II, he supported the German occupation.
L'Abbé Gantois was a priest in Lille, France. By 1929, he had written several pamphlets encouraging French Flemings to be proud of their Germanic heritage by using Flemish names and speaking the Flemish language rather than the French varieties. Adolf Hitler, a sergeant in the German occupation force in Lille, regarded Gantois' views as excellent.