Garantism, also known as the theory of constitutional guarantees, is a legal theory and political philosophy developed by Italian jurist Luigi Ferrajoli in the late 20th century. It conceives of the legal system as a set of guarantees designed to protect fundamental rights against abuses of power by public and private authorities. Initially formulated in the field of criminal law, Ferrajoli later expanded it into a general theory of constitutional democracy.
Garantism originates from Spain and Italy, where it is known as garantismo, often known as the "theory of constitutional guarantees". [1] Garantism proposes that every legitimate exercise of power must be conditioned by the existence of legal guarantees that protect individual and collective rights. [2] In this framework, law is understood not merely as an instrument of power butrather as a system of limits and obligations imposed on power itself. The theory emphasizes the primacy of constitutional norms, legality, and procedural guarantees as foundations of the rule of law. [3]
Ferrajoli, a disciple of Norberto Bobbio, first articulated the concept in his seminal work Derecho y razón: Teoría del garantismo penal (Law and Reason: Theory of Penal Garantism, 1995). In it, he proposed a model of criminal justice grounded in strict legality and protection of individual rights. In subsequent works, including Principia iuris. Teoria del diritto e della democrazia (Principia Iuris: Theory of Law and Democracy, 2007), Ferrajoli expanded the concept to a broader constitutional and political theory, outlining a rational structure for democratic legality and human rights protection. Ferrajoli's garantism is based on several key principles:
Garantism has had major influence in Italian, Spanish, and Latin American legal thought, particularly in discussions of constitutionalism, human rights, and criminal procedure. In the Spanish-speaking world, many of Ferrajoli’s works have been translated by Perfecto Andrés Ibáñez, a former magistrate of the Supreme Court of Spain. The theory has also shaped debates within the National Autonomous University of Mexico (UNAM) and other European and Latin American universities.