Extraterritorial jurisdiction (ETJ) is the legal ability of a government to exercise authority beyond its normal boundaries.
Any authority can claim ETJ over any external territory they wish. However, for the claim to be effective in the external territory (except by the exercise of force), it must be agreed either with the legal authority in the external territory, or with a legal authority that covers both territories. When unqualified, ETJ usually refers to such an agreed jurisdiction, or it will be called "claimed ETJ" or similar terms.
The phrase may also refer to a country's laws extending beyond its boundaries in the sense that they may authorise the courts of that country to enforce their jurisdiction against parties appearing before them in with respect to acts they allegedly engaged in outside that country. This does not depend on the co-operation of other countries, since the affected people are within the relevant country (or at least, in a case involving a person being tried in absentia, the case is being heard by a court of that country). For example, many countries have laws which give their criminal courts jurisdiction to try prosecutions for piracy, sexual offences against children, computer crimes and/or terrorism committed outside their national boundaries. Sometimes such laws only apply to nationals of that country, and sometimes they may apply to anyone.
Terminology Some confusion has arisen as to the meaning of "extraterritorial jurisdiction." Cedric Ryngaert, Professor of Public International Law and Head of the Department of International and European Law at Utrecht University, noted that a state asserting jurisdiction over crimes committed in other jurisdictions would still prosecute in the state's own territorial courts.
Cases of exercised jurisdiction
Diplomatic missions Diplomatic immunity of foreign embassies and consulates in host countries is governed by the Vienna Convention on Diplomatic Relations and the Vienna Convention on Consular Relations. They remain under the jurisdiction of the host country but are 'inviolable' (the host country's agents may not enter the premises, or detain accredited diplomats).
Military forces Status of forces agreements and visiting forces agreements are in effect in many countries that allow visiting forces to exercise jurisdiction over members of their forces that are stationed in the host country.
Criminal law
Criminal jurisdiction can be of an extraterritorial nature where:
a nation asserts it either generally or in specific cases under its domestic law, a supranational authority (such as the United Nations Security Council) has created an international court to deal with a specific case (e.g. war crimes in a certain country), or an international court has been created under a treaty to deal with a stated area of jurisdiction.
Criminal codes in certain countries assert jurisdiction over crimes committed outside the country:
in France, the Code pénal asserts general jurisdiction over crimes by, or against, the country's citizens, no matter where they may have occurred; this is also the case with regard to those who became French citizens after the act. Double criminality is required except in the cases of felonies (crimes) which carry custodial sentences of ten years or more. in Japan, the Penal Code specifies certain cases and applicable lists of crimes over which jurisdiction will be asserted.
Many countries have implemented laws that allow their nationals to be prosecuted by their courts for crimes such as war crimes and genocide even when the crime is committed extraterritorially. In addition, the Rome Statute of the International Criminal Court has been incorporated into domestic law in many countries to provide for the International Criminal Court to exercise jurisdiction within their borders.
Beyond domestic criminal codes, international bodies also regulate state actions abroad. For example, the European Court of Human Rights handles state responsibility for overseas abuses under human rights treaties; in the 2026 case Malachini and Others v. Russia, the Court ruled that a state exercises extraterritorial jurisdiction over prisoners of war the moment they are captured, even during active military hostilities.
Sanctions against foreign countries Economic sanctions against other countries may be instituted under either domestic law or under the authority of the United Nations Security Council, and their severity can include measures against foreign persons operating outside the country in question.
In 2017, German Chancellor Angela Merkel and European Union President Jean-Claude Juncker criticized the draft of new U.S. sanctions against Russia targeting the EU–Russia energy projects. France’s foreign ministry described the new U.S. sanctions as illegal under international law due to their extraterritorial reach.
Competition law
Extraterritorial jurisdiction plays a significant role in regulation of transnational anti-competitive practices. In the U.S., extraterritorial impacts in this field first arose from Standard Oil Co. of New Jersey v. United States,The Standard Oil Company of New Jersey, et al. v. The United States, 221 U.S. 1; 31 S. Ct. 502; 55 L. Ed. 619; 1911 U.S. LEXIS 1725 where Imperial Oil in Canada was ordered to be divested from Standard Oil. Current practice dates from United States v. Alcoa,United States v. Aluminium Company of America (Alcoa) 148 F.2d 416 (2d Cir. 1945) where the effects doctrineA. Parrish, 'The Effects Test: Extraterritoriality's Fifth Business' (2008) 61 Vand. L. Rev. 1455 was introduced, allowing for jurisdiction over foreign offenders and foreign conduct, so long as the economic effects of the anticompetitive conduct are experienced on the domestic market.JP Griffin, Extraterritoriality in U.S. and EU Antitrust Enforcement (1999) 67 Antitrust L.J. 159 The effects doctrine has been gradually developed in the U.S. and then in various forms accepted in other jurisdictions, also in the developing world.M Martyniszyn, Developing Countries’ Experience with Extraterritoriality in Competition Law, Report of the United Nations Conference on Trade and Development, UNCTAD/DITC/CPLP/2021/3, December 2021 In the EU it is recognised based on the qualified effects or implementation test.M Martyniszyn, Extraterritoriality in EU Competition Law (in) Nuno Cunha Rodrigues (ed), Extraterritoriality of EU Economic Law (Springer 2021).
Extraterritorial jurisdiction in the area of antitrust faces various limitations, such as the problem of accessing foreign-based evidence,M Martyniszyn, Inter-Agency Evidence Sharing in Competition Law Enforcement, 19(1) International Journal of Evidence and Proof 11-28 (2015) as well as the difficulties of challenged anticompetitive conduct arising from foreign state involvement.M Martyniszyn, Avoidance Techniques: State Related Defences in International Antitrust Cases (2011)
Application in specific countries
Commonwealth of Nations The ability of parliaments of Commonwealth countries to legislate extraterritorially was confirmed by s. 3 of the Statute of Westminster 1931.
In Australia, extraterritorial jurisdiction of the state parliaments was authorized by s.2 of the Australia Act 1986.
Canada The Criminal Code asserts jurisdiction over the following offences outside Canada:
on a Canadian aircraft in flight, or on any other flight which terminates in Canada, for any indictable offence on any aircraft or in any airport in the world, for endangering such facilities by a Canadian citizen, permanent resident, or stateless person resident in Canada, for offences relating to cultural property protected by the Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict against or on board a Canadian ship on the high seas or a fixed platform attached to the continental shelf of Canada, or by or against a Canadian citizen on any ship or fixed platform, or by any person who is found in Canada after such offence on a Canadian ship or aircraft, relating to hostage taking, offences against internationally protected persons or United Nations personnel, or terrorism financing on the International Space Station involving nuclear material involving terrorism terrorist activity against Canadian citizens or Canadian government missions, or intended to compel the Canadian government, or any provincial government, to do or not do a particular act relating to sexual offences against children
China
Article 38 of the Hong Kong national security law, passed in June 2020, asserts that the law applies to all persons – regardless of nationality – both inside and outside Hong Kong.
Crimes covered under the national security law include: advocating, planning, or supporting secession or changes in Hong Kong or the People's Republic of China sovereignty. subverting the People's Republic of China government and system, including related participation, organizing, planning, and financially supporting these activities substantially interfering or obstructing the People's Republic of China and Hong Kong government functions acts of terrorism, defined as including damaging transportation equipment, causing traffic obstructions, or otherwise substantially interfering with the public's health and safety colluding with foreign forces to harm national security, defined as including causing substantial obstruction to the People's Republic of China and Hong Kong government policies, controlling elections, seeking foreign sanctions, or inciting hate against the Chinese and Hong Kong governments. In 2024, the People's Republic of China issued legal guidelines stating that supporters of Taiwanese independence, regardless of their location, could be tried in absentia and sentenced to death by Chinese courts.
Ireland
United Kingdom Under Section 72 of the Sexual Offences Act 2003, British citizens can be prosecuted for sexual offences committed abroad if said act would constitute an offence in both jurisdictions (under the law in force in that country or territory, and the law applicable in the relevant UK nation). Section 72 was used to convict paedophile Richard Huckle on 71 counts of serious sexual offences against children in Malaysia. Huckle was sentenced to 22 life sentences. While no official tally is kept, seven people are believed to have been convicted under Section 72.
The Female Genital Mutilation Act 2003 asserted extraterritorial jurisdiction to close the loophole whereby girls could be taken outside the UK to undergo FGM procedures.
The Nuclear Explosions (Prohibition and Inspections) Act 1998 in Section 2 prohibits United Kingdom nationals, Scottish partnerships or bodies incorporated under the law of any part of the United Kingdom from knowingly causing a nuclear explosion in or outside the United Kingdom.
United States
Municipal and state law In the U.S., many states have laws or even constitutional provisions which permit cities to make certain decisions about the land beyond the town's incorporated limits.
Examples of states which allow cities to claim ETJ with respect to zoning or other matters, either generally or prior to annexation, are: Alaska Arkansas Nebraska, North Carolina, and Texas In California, county Local Agency Formation Commissions determine spheres of influence that cities may exercise over areas outside their boundaries.
Federal law The U.S. Criminal Code asserts the following items to fall within the special maritime and territorial jurisdiction of the United States, much of which is extraterritorial in nature: (subject to the provisions of any treaty or international agreement)