The Constitution of the Italian Republic is the fundamental law of the Italian State, which as such occupies the top of the hierarchy of sources in the legal system of the Republic.

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The Italian Constitution was promulgated by the provisional Head of State Enrico De Nicola on December 27, 1947 and published on the same day in the extraordinary edition of the Official Gazette of the Italian Republic n.298.

It entered into force on January 1, 1948 and consists of 139 articles and 18 transitional provisions.

Its standards are divided into three groups:
- the first concerns the fundamental principles of the Italian legal system
- the second establishes the rights and duties of citizens (Part I)
- the third determines the organization of the Republic, regulating its main organs and their functions (Part II).

The constitutional system adopted is the rigid type and the transformation of its norms can only be ordered with a constitutional law, enacted with a particular parliamentary procedure.

Any normal law that deviates from its principles can be challenged for unconstitutionality before the Constitutional Court.