Jacques de Mahieu (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 an 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.
Born in Marseille, as a young man Jacques de Mahieu was influenced by authors such as Georges Sorel, Charles Maurras, and Alexis Carrel and joined the Action Française.
During World War II, Jacques de Mahieu was a member of the Charlemagne Division.
After the liberation of France, he was one of the first to flee to Juan Perón's Argentina through the ratlines organized by Perón and the Vatican. A Naturalized Argentine, he became an ideologue of the Peronist movement, before becoming a mentor to a Roman Catholic nationalist youth group in the 1960s.
Jacques de Mahieu studied at the Universities of Mendoza and Buenos Aires; he graduated in philosophy, as doctor Honoris Causa of Medicine, doctor in economic sciences, and doctor in political science.