International Court of Justice

Key Takeaways

• The International Court of Justice (ICJ) is the principal judicial organ of the United Nations. It settles legal disputes between States and gives advisory opinions on questions of international law.
• The ICJ was established in 1945 under the United Nations Charter and began functioning in April 1946. Its headquarters is located at the Peace Palace in The Hague, Netherlands.
• The Court consists of 15 independent judges, elected by the United Nations General Assembly and Security Council for nine-year terms. Judges may be re-elected.
• The ICJ exercises two main types of jurisdiction: contentious jurisdiction, involving legal disputes between States, and advisory jurisdiction, involving legal questions referred by authorised United Nations bodies.
• Only States can appear as parties in contentious proceedings before the ICJ. Individuals, companies and non-governmental organisations cannot directly institute cases before it.
• Judgments delivered by the ICJ in contentious cases are final and binding on the parties concerned. Advisory opinions are generally not legally binding but carry considerable legal authority.
• The ICJ plays an important role in the peaceful settlement of international disputes, interpretation of treaties, development of international law and protection of the international legal order.

What Is the International Court of Justice?

The International Court of Justice (ICJ) is the principal judicial organ of the United Nations responsible for resolving legal disputes between States in accordance with international law. It also provides advisory opinions on legal questions referred to it by authorised United Nations organs and specialised agencies.

The ICJ is commonly known as the World Court. It operates under the United Nations Charter and the Statute of the International Court of Justice, which forms an integral part of the Charter.

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The Court deals with disputes involving international treaties, territorial boundaries, diplomatic relations, State responsibility, maritime rights and other matters governed by international law.

Unlike national courts, the ICJ does not exercise general compulsory jurisdiction over all disputes involving States. Its authority to decide contentious cases ordinarily depends on the consent of the States concerned.

The official languages of the Court are English and French.

Historical Background of the International Court of Justice

The International Court of Justice emerged from efforts to establish a permanent international judicial institution for resolving disputes peacefully.

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Before the ICJ, the Permanent Court of International Justice (PCIJ) operated under the League of Nations system. Established in 1920, the PCIJ began functioning in 1922 and contributed significantly to the development of international legal principles.

Following the Second World War, the United Nations was established in 1945 to promote international peace and security. A new judicial institution was considered necessary within the United Nations framework.

The ICJ was consequently established through the United Nations Charter, adopted at San Francisco on 26 June 1945. The Court began functioning in April 1946, replacing the PCIJ.

The ICJ retained several institutional and procedural features of its predecessor while becoming the principal judicial organ of the United Nations.

Legal Framework of the International Court of Justice

The functioning of the ICJ is primarily governed by the United Nations Charter, the Statute of the International Court of Justice and the Rules of Court.

United Nations Charter

Chapter XIV of the United Nations Charter, comprising Articles 92 to 96, establishes the constitutional framework of the ICJ.

• Article 92: Declares the ICJ to be the principal judicial organ of the United Nations and recognises its Statute as an integral part of the Charter.
• Article 93: Provides that all United Nations Member States are automatically parties to the ICJ Statute. It also allows non-member States to become parties under prescribed conditions.
• Article 94: Requires United Nations Member States to comply with ICJ decisions in cases to which they are parties. It also provides for recourse to the Security Council where a party fails to comply with a judgment.
• Article 95: Clarifies that United Nations Members may refer their disputes to other tribunals through existing or future agreements.
• Article 96: Authorises the General Assembly and Security Council to request advisory opinions and permits other authorised UN organs and specialised agencies to seek opinions within their areas of activity.

Statute of the International Court of Justice

The ICJ Statute contains 70 Articles organised into five chapters covering the Court’s organisation, competence, procedure, advisory opinions and amendment.

It regulates matters such as judicial qualifications, elections, jurisdiction, applicable law, proceedings, judgments and advisory functions.

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Composition of the International Court of Justice

The International Court of Justice consists of 15 judges elected independently of their nationality. The judges must possess high moral character and recognised qualifications in national or international law.

Under Article 2 of the ICJ Statute, judges must either qualify for appointment to the highest judicial offices in their respective countries or be jurists of recognised competence in international law.

The Court’s composition must also reflect the principal legal systems of the world.

How Are ICJ Judges Elected?

ICJ judges are elected by the United Nations General Assembly and the Security Council, voting separately.

A candidate must obtain an absolute majority in both organs to be elected. No two judges serving as members of the Court may have the same nationality.

Each judge serves for nine years and is eligible for re-election. One-third of the Court’s membership is ordinarily renewed every three years to maintain institutional continuity.

President and Vice-President

The judges elect a President and Vice-President from among themselves for three-year terms.

The President presides over the Court’s proceedings, directs judicial work and performs administrative and representative functions.

Independence of Judges

Judges serve in their individual capacity rather than as representatives of their governments. They are required to exercise their functions independently and impartially.

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Under Article 18 of the Statute, a judge may be dismissed only when, in the unanimous opinion of the other members of the Court, the judge has ceased to fulfil the required conditions.

Judges Ad Hoc

Article 31 permits a State involved in a contentious case to choose a judge ad hoc in certain circumstances where it has no judge of its nationality on the Bench.

Such judges participate in the particular case and have the same voting rights as other judges. However, they remain subject to the judicial duties of independence and impartiality.

The Registry assists the Court in carrying out its judicial, administrative and diplomatic functions.

Jurisdiction of the International Court of Justice

Jurisdiction refers to the legal authority of the ICJ to hear and decide matters brought before it.

The Court exercises two principal types of jurisdiction: contentious jurisdiction and advisory jurisdiction.

Contentious Jurisdiction

Contentious jurisdiction concerns legal disputes between States submitted to the ICJ for binding determination.

Under Article 34(1) of the ICJ Statute, only States may be parties to contentious cases. Individuals, corporations, political organisations and non-governmental organisations cannot directly bring contentious proceedings before the Court. This reflects the particular position of individuals in international law, where individual rights and access to judicial remedies depend on the applicable legal framework.

The ICJ may exercise contentious jurisdiction through different forms of State consent.

1. Special Agreement

Two or more States may expressly agree to submit an existing dispute to the Court. This arrangement is commonly called a compromis.

For example, States disputing their maritime boundary may jointly request the ICJ to determine the applicable international legal principles.

2. Treaty-Based Jurisdiction

States may accept the Court’s jurisdiction through provisions contained in international treaties.

Such provisions, commonly known as compromissory clauses, may allow disputes concerning the interpretation or application of a treaty to be submitted to the ICJ.

3. Optional Clause Declarations

Article 36(2) allows States to recognise the Court’s compulsory jurisdiction concerning specified categories of legal disputes in relation to other States accepting the same obligation.

These declarations may contain reservations, limitations or conditions of reciprocity.

Consequently, compulsory jurisdiction under Article 36(2) is not universally applicable to all States.

4. Forum Prorogatum

In certain situations, a State may accept the Court’s jurisdiction after proceedings have been instituted.

Such subsequent acceptance can establish jurisdiction even where consent did not exist when the application was originally submitted.

Advisory Jurisdiction

Advisory jurisdiction enables the ICJ to provide legal opinions on questions referred by authorised United Nations bodies.

Under Article 96 of the UN Charter and Article 65 of the ICJ Statute, the General Assembly and Security Council may request advisory opinions on legal questions.

Other UN organs and specialised agencies may also request opinions when authorised by the General Assembly, provided the legal questions arise within the scope of their activities.

Advisory opinions are generally not binding in the same manner as contentious judgments. Nevertheless, they provide authoritative interpretations of international law and may influence international legal practice.

Powers and Functions of the International Court of Justice

The ICJ performs several important judicial functions within the international legal system.

Settlement of International Disputes

The Court resolves legal disputes involving treaty interpretation, international boundaries, diplomatic relations, State responsibility and the application of international legal obligations.

Its proceedings offer States a judicial alternative to the use of force or other forms of confrontation.

Interpretation of International Law

The ICJ interprets international treaties, customary international law and general principles of law when deciding disputes.

Its reasoning contributes to the clarification and consistent application of international legal rules.

Determination of State Responsibility

The Court may determine whether a State has violated an international obligation and identify the legal consequences of that violation.

The principles of State responsibility under international law explain when internationally wrongful conduct can be attributed to a State and what legal consequences follow.

Depending on the circumstances, those consequences may include cessation of unlawful conduct, assurances of non-repetition or reparation.

Indication of Provisional Measures

Under Article 41 of the ICJ Statute, the Court may indicate provisional measures when necessary to preserve rights pending its final judgment.

Such measures may be required where there is a risk of irreparable prejudice to rights claimed in the proceedings.

Provisional measures indicated by the ICJ are legally binding. However, they are temporary and do not constitute a final decision on the merits of the dispute.

Delivery of Advisory Opinions

The Court provides advisory opinions that assist authorised international institutions in understanding and applying international law.

These opinions may address questions involving international obligations, institutional powers, territorial status and other legal matters.

Sources of International Law Applied by the ICJ

Article 38(1) of the ICJ Statute identifies the principal sources of international law applied by the Court when deciding disputes.

International Conventions and Treaties

International treaties establish legally binding obligations between States that have consented to be bound by them.

The ICJ examines relevant treaty provisions, their interpretation and their application to the dispute. The law of treaties in international law governs matters such as treaty formation, interpretation, reservations, validity and termination.

International Custom

Customary international law develops from general State practice accepted as law.

Two important elements are generally necessary: State practice, reflecting the conduct of States, and opinio juris, reflecting the belief that such conduct is required or permitted by law.

General Principles of Law

General principles provide legal rules recognised across legal systems that may assist the Court in resolving disputes.

They may include principles relating to good faith, legal responsibility and procedural fairness, where recognised as applicable under international law.

Judicial Decisions and Juristic Writings

Article 38(1)(d) recognises judicial decisions and the teachings of highly qualified publicists as subsidiary means for determining rules of law.

Previous judicial decisions may therefore assist the ICJ in interpreting international law, although its judgments do not operate through a general system of binding precedent.

Article 38(2) also permits the Court to decide a dispute ex aequo et bono, based on considerations of fairness rather than strictly applying legal rules, but only when the parties agree.

Procedure Before the International Court of Justice

Proceedings before the ICJ follow a structured process governed by its Statute and Rules of Court.

Institution of Proceedings

Under Article 40, contentious proceedings may begin through a written application submitted by one State or notification of a special agreement between States.

The document identifies the parties and the subject matter of the dispute.

Written Proceedings

Article 43 provides for written pleadings containing the legal arguments, factual submissions and supporting documents of the parties.

These ordinarily include memorials, counter-memorials and, where necessary, replies or rejoinders.

Oral Proceedings

During oral hearings, the parties present their arguments through authorised agents, counsel and advocates.

The Court may hear witnesses and experts, examine evidence and ask questions relevant to the dispute.

Preliminary Objections and Provisional Measures

A State may raise preliminary objections concerning jurisdiction or admissibility.

The Court may also consider requests for provisional measures where urgent protection of claimed rights is necessary.

Judgment

After examining the submissions, the Court deliberates privately and delivers its reasoned judgment.

Decisions are taken by a majority of judges present. Judges may append separate or dissenting opinions.

Under Article 60, judgments are final and without appeal. However, the Statute permits interpretation of judgments and revision in narrowly defined circumstances.

Are ICJ Judgments Legally Binding?

Yes. ICJ judgments in contentious cases are legally binding on the States that are parties to the particular dispute.

Article 59 of the ICJ Statute provides that a decision has binding force only between the parties and in respect of that particular case.

Article 94(1) of the UN Charter requires every UN Member State to comply with ICJ decisions in cases to which it is a party.

Where a State fails to comply, the other party may approach the Security Council under Article 94(2). The Council may make recommendations or decide upon measures to give effect to the judgment.

However, the ICJ does not possess an independent enforcement agency. Implementation ordinarily depends on State compliance and, where applicable, action through United Nations institutions.

Important Cases Decided by the International Court of Justice

Several landmark decisions illustrate the ICJ’s contribution to international law.

Corfu Channel Case (United Kingdom v Albania), 1949

The dispute arose after British warships suffered damage from underwater mines in Albanian territorial waters.

The ICJ held Albania internationally responsible for failing to warn of the danger despite its knowledge of the minefield.

The Court also held that subsequent British minesweeping operations undertaken without Albania’s consent violated Albanian sovereignty.

The decision in the Corfu Channel Case is important for understanding State responsibility, territorial sovereignty and the use of circumstantial evidence in international proceedings.

North Sea Continental Shelf Cases, 1969

These cases concerned the delimitation of continental shelf boundaries involving Germany, Denmark and the Netherlands.

The ICJ examined whether the equidistance principle constituted a binding rule of customary international law.

The Court concluded that the equidistance principle was not applicable as a customary rule in the circumstances and emphasised delimitation by agreement in accordance with equitable principles.

The judgment remains significant for understanding customary international law and maritime boundary disputes.

Barcelona Traction Case (Belgium v Spain), 1970

The dispute involved Belgium’s attempt to exercise diplomatic protection on behalf of Belgian shareholders in a Canadian company.

The Court rejected Belgium’s claim because Belgium did not possess the necessary legal standing to exercise diplomatic protection in the circumstances.

The judgment is particularly significant for its discussion of obligations erga omnes, which are obligations owed towards the international community as a whole.

Nicaragua v United States, 1986

Nicaragua alleged that the United States had violated international law through military and paramilitary activities directed against it.

The ICJ found violations of customary international law concerning the prohibition of force, non-intervention and respect for State sovereignty.

The judgment is an important authority on the relationship between treaty law and customary international law, particularly regarding the prohibition of unlawful force.

Jadhav Case (India v Pakistan), 2019

India instituted proceedings concerning Pakistan’s treatment of Indian national Kulbhushan Jadhav, who had been sentenced to death by a Pakistani military court.

The dispute primarily concerned consular rights under Article 36 of the Vienna Convention on Consular Relations.

In its judgment of 17 July 2019, the ICJ held that Pakistan had violated its obligations concerning consular notification and access. The Court required Pakistan to provide effective review and reconsideration of Jadhav’s conviction and sentence.

The judgment in the Kulbhushan Jadhav Case demonstrates the ICJ’s role in resolving disputes concerning treaty obligations and consular relations between States.

Difference Between the International Court of Justice and International Criminal Court

The International Court of Justice and the International Criminal Court (ICC) are distinct judicial institutions. Although both are located in The Hague, their jurisdictions, functions and legal frameworks differ considerably.

The ICJ determines the international legal responsibility of States, whereas the ICC determines individual criminal responsibility.

Limitations of the International Court of Justice

Despite its important role, the ICJ faces several institutional and practical limitations.

• Dependence on State Consent: The Court ordinarily cannot exercise contentious jurisdiction without the consent of the States concerned. This limits its ability to adjudicate every international legal dispute.
• Absence of Direct Enforcement Powers: The Court cannot independently enforce its judgments through police or military authorities. Compliance depends primarily on States and relevant international institutions.
• Limited Access: Individuals, companies and non-governmental organisations cannot directly institute contentious proceedings before the ICJ, even when international disputes affect their interests.
• Political and Diplomatic Challenges: International disputes may involve sensitive political interests. Although the Court decides legal questions independently, implementation of its judgments may be affected by broader international relations.
• Length of Proceedings: Complex disputes may involve extensive written submissions, jurisdictional objections, evidence and oral hearings, resulting in lengthy proceedings.

These limitations do not eliminate the Court’s legal significance but affect the extent to which international judicial decisions can resolve disputes in practice.

Conclusion

The International Court of Justice is an essential institution in the administration of international justice. Established under the United Nations Charter, it performs two primary functions: settling legal disputes between States and providing advisory opinions on international legal questions.

Its jurisdiction, composition, procedure and powers are governed principally by the ICJ Statute and the United Nations Charter. Although the Court faces limitations concerning jurisdiction and enforcement, its decisions continue to shape the interpretation and application of international law.

The ICJ therefore serves as an important mechanism for maintaining the international legal order, promoting peaceful dispute resolution and strengthening the rule of law in relations between States.

Note: This article was originally written by Gourav Mundra (Hidayatullah National Law University) and published on 17 August 2020. It was subsequently updated by the LawBhoomi team on 12 October 2026.