Ioan Constantin Filitti (Romanian pronunciation: [iˈo̯aŋ konstanˈtin fiˈliti]; first name also Ion; Francized Jean C. Filitti; May 8, 1879 – September 21, 1945) was a Romanian historian, diplomat and conservative theorist, best remembered for his contribution to social history, legal history, genealogy and heraldry. A member of the Conservative Party and an assistant of its senior leader Titu Maiorescu, he had aristocratic (boyar) origins and an elitist perspective. Among his diverse contributions, several focus on 19th-century modernization under the Regulamentul Organic regime, during which Romania was ruled upon by the Russian Empire. As a historian, Filitti is noted for his perfectionism, and for constantly revising his own works.