Viscount Léon de Poncins (3 November 1897 – 18 December 1975) was a French aristocrat and a traditional Catholic journalist and essayist.
He authored numerous books and articles advancing a Judeo-Masonic conspiracy theory.
Léon de Poncins' explanation for most of the major revolutionary political upheavals of modernity was the influence of certain secret societies with an anti-Christian agenda — as well as a "occult war" waged by those possessing a diabolical kind of "faith".