Overview

Sources of International Law

The sources of international law are classified into four categories under Article 38(1) of the Statute of the International Court of Justice: treaties, international custom, general principles of law, and judicial decisions and teachings. These serve as the sources of legal norms in the international community and play a crucial role in resolving international disputes and regulating international relations.

international law sources of law treaties customary international law general principles ICJ UN Charter
code slug name description articleReference
38-1-a treaties Treaties (International Conventions) Legally binding agreements concluded between subjects of international law. ICJ Statute Article 38(1)(a)
38-1-b customary-international-law Customary International Law Legal norms formed through repeated and consistent state practice and opinio juris. ICJ Statute Article 38(1)(b)
38-1-c general-principles-of-law General Principles of Law Fundamental legal principles recognized by civilized nations. ICJ Statute Article 38(1)(c)
38-1-d judicial-decisions-and-teachings Judicial Decisions and Teachings Judicial decisions and teachings of publicists as subsidiary means for determining rules of law. ICJ Statute Article 38(1)(d)

A classification of the legal sources of international law.