Gaetano De Sanctis (15 October 1870, Rome – 9 April 1957) was an Italian ancient historian, classicist and lifetime senator (1950-1957).As the collection of his 'scritti minori' illustrates, his scope of scholarship ranged from Homer down to the Byzantine Empire. He was the influential teacher of Arnaldo Momigliano. His work 'Storia dei Romani' could be considered a monumental work. He was governing commissar of the Italian Numismatic Institute from 1944 to 1952 and president of the "Istituto dell'Enciclopedia Italiana" (Treccani) from 1947 to 1954.