Istituto della Enciclopedia Italiana (Treccani)

The Istituto della Enciclopedia Italiana, universally known as Treccani, is a private institution of national interest founded on 18 February 1925 by Giovanni Treccani degli Alfieri and Giovanni Gentile. Headquartered since 1927 in the historic Palazzo Mattei di Paganica in Rome, its founding mission was to create, update, publish, and disseminate the Enciclopedia Italiana di Scienze, Lettere ed Arti. Such is its cultural significance that its President is appointed by the President of the Republic; for 2024–2029 that role is held by philologist Carlo Ossola.

The Institute's flagship publication, produced between 1929 and 1937, enlisted over 3,200 scholars—including Guglielmo Marconi and Benedetto Croce—across 35 volumes and more than 60,000 entries. Since 1975, Treccani has expanded into specialised encyclopaedias covering art, archaeology, law, cinema, fashion, sport, life sciences, and more, alongside art books and digital resources. Its website offers articles, e-books, interactive resources, and educational tools held to rigorous editorial standards.

Treccani employs between 51 and 200 people and celebrated its centenary in 2025. In Italian culture, the phrase "it says so in the Treccani" functions as a marker of certified, indisputable fact, underscoring the Institute's unrivalled authority as a validator of knowledge. This standing makes innovations in knowledge management, digital publishing, and information integrity highly relevant to its ongoing mission.