Xavier de Montclos (30 August 1924 â 21 September 2018) was a 20thâÂÂ21st-century French historian, a specialist of the history of religions and particularly Christianity.
In 1965, he defended his thesis devoted to Lavigerie, le Saint-Siège et l'ÃÂglise, de l'avènement de Pie IX àl'avènement de Léon XIII, 1846-1978. In 1966, he supported a complementary thesis on Le toast d'Alger, documents, 1890-1891.
He is emeritus professor at the Lumière University Lyon 2.
With and , he directed the publication of the Dictionnaire du monde religieux dans la France contemporaine. He also collaborated to the making of the Encyclopædia Universalis by writing two articles about Charles Martial Lavigerie and the .
In 1967, Xavier de Montclos was awarded the Prix Broquette-Gonin in literature for his Le Toast dâÂÂAlger (1890-1891).