The Enciclopedia Italiana di scienze, lettere ed arti ("Italian Encyclopaedia of Science, Letters, and Arts"), is an Italian encyclopedia, generally regarded as the most authoritative of that language. The publication Encyclopaedias: Their History Throughout The Ages regards it as one of the greatest encyclopedias, along with the Encyclopædia Britannica Eleventh Edition and the Spanish Enciclopedia universal ilustrada europeo-americana.
The encyclopedia is often known as Enciclopedia Treccani, for its developer Giovanni Treccani. The first edition was published serially between 1925 and 1936.[1] In all, 35 volumes were published, plus one index volume. The set contained 60,000 articles and 50 million words.[2] Each volume is approximately 1015 pages, and 26 supplementary volumes were published between 1938 and 2006.
Most articles of the work are signed with the initials of the author. An essay credited to Benito Mussolini entitled "The Doctrine of Fascism" was included in the 1932 edition of the Enciclopedia Italiana, although it was likely ghost-written by Giovanni Gentile.