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EnglishComparative Constitutional and Institutional Law7 min readJuly 11, 2026

Judicial authority and institutional review: understanding the roles of the US Supreme Court and the Court of Justice of the European Union

An educational overview of the institutional functions, jurisdictional scope, and opinion-issuing processes of the Supreme Court of the United States and the Court of Justice of the European Union, drawing on official sources from each institution.

Introduction to apex judicial institutions

Among the most consequential institutions in any legal order are those courts that sit at the apex of the judicial hierarchy and whose decisions carry binding authority across an entire legal system. Two such institutions — the Supreme Court of the United States and the Court of Justice of the European Union — occupy that position within their respective legal orders. Each publishes its decisions and opinions through official channels that serve as the authoritative record of the law as interpreted by those courts.

Understanding how these institutions operate, how their opinions are issued, and what legal weight those opinions carry is essential for legal practitioners, scholars, policymakers, and informed members of the public. This article draws exclusively on the official sources maintained by each institution to provide an educational overview of their roles and functions.

The Supreme Court of the United States: opinions and their publication

The Supreme Court of the United States publishes its opinions through the official opinions portal maintained at supremecourt.gov. This portal serves as the primary and authoritative source for the Court's written decisions, including majority opinions, concurring opinions, and dissenting opinions issued by the justices.

Opinions issued by the Supreme Court represent the final word of the federal judiciary on questions of federal law and constitutional interpretation. Because the Court sits at the top of the federal judicial hierarchy, its decisions bind all lower federal courts and, on matters of federal and constitutional law, state courts as well. The publication of opinions through the official portal ensures that the public, legal professionals, and government actors have direct and unmediated access to the Court's reasoning and holdings.

The opinions portal at supremecourt.gov organises decisions by term, allowing users to locate opinions issued during a given court term. This structure reflects the Court's practice of operating on an annual term basis, during which it hears oral arguments, deliberates, and issues written opinions. The availability of opinions in this format supports transparency and public accountability, which are foundational values of the American judicial system.

The Court of Justice of the European Union: institutional structure and function

The Court of Justice of the European Union, accessible through its official portal at curia.europa.eu, is the judicial institution of the European Union responsible for ensuring that EU law is interpreted and applied uniformly across all member states. The institution comprises several courts, with the Court of Justice itself being the highest among them.

The Court of Justice of the European Union exercises jurisdiction over a range of proceedings, including references for preliminary rulings from national courts of member states, actions for failure to fulfil obligations, appeals from the General Court, and other matters provided for under EU law. The preliminary ruling procedure is particularly significant because it allows national courts to refer questions of EU law to the Court of Justice, ensuring consistent interpretation across the legal systems of all member states.

The official curia portal provides access to the case law of the Court of Justice of the European Union, including judgments, orders, and opinions of advocates general. These documents constitute the authoritative record of how the Court has interpreted EU law and are essential reference points for legal practitioners, national courts, and EU institutions alike. The availability of this case law through the official portal reflects the Court's commitment to transparency and accessibility in the administration of EU justice.

Comparing opinion-issuing processes across the two institutions

While both the Supreme Court of the United States and the Court of Justice of the European Union issue written decisions that carry binding legal authority, the processes by which they do so reflect the distinct constitutional and institutional frameworks within which each operates.

The Supreme Court of the United States issues opinions that may reflect a range of judicial views, with individual justices able to write separately to concur in or dissent from the majority's reasoning or outcome. This practice of individual opinion-writing is a distinctive feature of the American judicial tradition and allows the public and legal community to understand the full range of legal reasoning considered by the Court.

The Court of Justice of the European Union, by contrast, issues collegiate judgments that do not attribute individual positions to specific judges. This approach reflects a different institutional tradition, one in which the Court speaks with a single institutional voice. However, the Court's proceedings also involve opinions from advocates general, who are independent legal officers attached to the Court. These opinions, while not binding, provide detailed legal analysis that often informs the Court's ultimate judgment and are published through the curia portal alongside the Court's decisions.

Both institutions make their decisions publicly available through official online portals, a practice that underscores the shared commitment of both legal orders to judicial transparency and the rule of law.

The significance of official sources in legal research

For anyone seeking to understand the law as interpreted by either of these institutions, consulting the official sources is essential. The opinions portal at supremecourt.gov and the curia portal at curia.europa.eu represent the authoritative and unaltered text of each institution's decisions. Secondary sources, commentaries, and summaries may provide useful context, but they cannot substitute for the primary texts issued by the courts themselves.

Legal researchers, students, and practitioners are encouraged to consult these official portals directly when seeking to understand the holdings and reasoning of either court. The portals are designed to be publicly accessible and are regularly updated as new decisions are issued, making them reliable and current sources of legal information.

The practice of publishing judicial opinions through official, publicly accessible channels is itself a reflection of a deeper principle: that the law must be knowable and accessible to those it governs. Both the Supreme Court of the United States and the Court of Justice of the European Union uphold this principle through their respective official publication practices.

Conclusion

The Supreme Court of the United States and the Court of Justice of the European Union are among the most influential judicial institutions in the world. Each plays a central role in interpreting and applying the law within its respective legal order, and each publishes its decisions through official channels that serve as the definitive record of its jurisprudence.

Understanding the institutional roles, jurisdictional scope, and opinion-issuing practices of these courts is an important part of legal literacy in an increasingly interconnected world. By consulting the official sources maintained by each institution — supremecourt.gov for the Supreme Court of the United States and curia.europa.eu for the Court of Justice of the European Union — individuals can access the primary legal texts that shape the law in two of the world's most significant legal systems.

This article is for educational and informational purposes only and does not constitute legal advice.

Sources consulted

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