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". Garantism proposes that every legitimate exercise of power must be conditioned by the existence of legal guarantees that protect individual and collective rights. In this framework, law is understood not merely as an instrument of power but rather 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.
Ferrajoli, a disciple of Norberto Bobbio, first articulated the concept in his seminal work Derecho y razón: TeorÃÂa 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 FerrajoliâÂÂs 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.