Jacques de Mahieu, whose real name is Jacques Girault, (1915–1990) was a French Argentine anthropologist and Peronist.He wrote several books on esoterism, which he mixed with anthropological theories inspired by scientific racism. A collaborationist in Vichy France, he became a Peronist ideologue in the 1950s, mentor to a Roman Catholic nationalist youth group in the 1960s, and later in life, head of the Argentine chapter of Spanish neo-Nazi group CEDADE.