The Constitution of the Italian Republic is the fundamental law of the Italian State, and is positioned at the top of the hierarchy of sources in the legal system of the Republic.

Considered a written constitution, rigid, long, voted, compromise, secular, democratic and basically programmatic, it is made up of 139 articles and 18 transitional and final provisions.

Approved by the Constituent Assembly on 22 December 1947 and promulgated by the provisional head of state Enrico De Nicola on the following 27 December, published in the Official Gazette no. 298, extraordinary edition, of the same day, and entered into force on 1 January 1948, there are three originals, one of which is preserved in the historical archive of the Presidency of the Italian Republic