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What is genocide? The legal definition, explained

Genocide is any of five acts committed with intent to destroy a national, ethnic, racial or religious group, in whole or in part. Where the definition comes from, and why intent is hard to prove.

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Genocide is the crime of acting to destroy a national, ethnic, racial or religious group, in whole or in part. What counts as genocide in law is set by the 1948 Genocide Convention: one of five listed acts, from killing members of the group to forcibly taking its children, committed with the intent to destroy that group "as such". The intent, not the number of deaths, is what makes a crime genocide rather than another atrocity.

In short

  • The word was coined in 1944 by the lawyer Raphael Lemkin, and the UN made genocide a crime under international law in 1948.
  • It takes two things: one of five prohibited acts, and the specific intent to destroy a protected group as a group.
  • International courts have ruled that genocide happened in Rwanda in 1994, at Srebrenica in 1995 and in Cambodia under the Khmer Rouge.

Where does the word genocide come from?

Raphael Lemkin, a Polish-Jewish lawyer, invented the word in his 1944 book Axis Rule in Occupied Europe, joining the Greek genos, race or tribe, with the Latin -cide, killing. As a student he had read about the Ottoman massacres of Armenians, and he spent years arguing that international law had no name or remedy for the deliberate destruction of a people. He fled Poland after the German invasion and reached the United States, and while he worked on the Nuremberg trials he learned that 49 of his relatives, including his parents, had been killed in the Holocaust, according to the United States Holocaust Memorial Museum.

Lemkin got the word into the Nuremberg indictment, but the tribunal did not convict anyone of genocide as such; it used the charge of crimes against humanity, and only for acts connected with the war. Lemkin lobbied UN delegations until the General Assembly adopted the Convention on the Prevention and Punishment of the Crime of Genocide on 9 December 1948, one day before the Universal Declaration of Human Rights. It came into force on 12 January 1951. By 5 November 2026 it had 154 states parties, according to the UN treaty record.

How does the law define genocide?

Article II of the convention, quoted on the UN Office on Genocide Prevention's page, defines genocide as any of these acts "committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such":

  1. Killing members of the group.
  2. Causing serious bodily or mental harm to members of the group.
  3. Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part.
  4. Imposing measures intended to prevent births within the group.
  5. Forcibly transferring children of the group to another group.

Three features of this definition surprise people. Genocide doesn't require mass killing: forcibly removing a group's children, with the intent to destroy it, qualifies. It doesn't require a war: the crime can happen in peacetime. And only four kinds of group are protected. Political and social groups were left out in 1948, after objections from several states, so the mass killing of people for their politics or class is usually prosecuted as a crime against humanity instead.

The convention also makes it a crime to conspire to commit genocide, to incite it "directly and publicly", to attempt it and to be complicit in it, and it obliges every party to prevent genocide as well as punish it. Under Article IX, any party can take a dispute over the convention to the International Court of Justice, and because every party has a stake in its being kept, a state need not be the victim to bring a case.

How is genocide different from crimes against humanity and war crimes?

The three are the core international crimes, and the same events can be all three. They differ in what must be proved.

Genocide Crimes against humanity War crimes
Key element Intent to destroy a protected group as such Acts within a widespread or systematic attack on civilians Serious breaches of the laws of armed conflict
Needs a war? No No Yes
Who is protected National, ethnic, racial or religious groups Any civilian population Civilians, prisoners, the wounded and others the laws of war protect
Examples of acts Killing, preventing births, taking children Murder, enslavement, deportation, torture, persecution Killing prisoners, targeting civilians, hostage-taking
Main source Genocide Convention, 1948 Nuremberg Charter, later the Rome Statute of 1998 [[what-are-the-geneva-conventions

"Ethnic cleansing", the forced removal of a group from an area, is not a separate crime in any treaty. It can amount to crimes against humanity, and to genocide only if the aim is to destroy the group rather than to drive it out.

Why is genocidal intent so hard to prove?

Perpetrators rarely write down that they intend to destroy a group. Courts must usually infer the intent from conduct: the scale and pattern of killing, the targeting of a group's leaders or men of fighting age, speeches, and what was done to those who survived. The International Court of Justice has set a high bar. In Bosnia v. Serbia in 2007, and again in Croatia v. Serbia in 2015, it held that when intent is inferred from a pattern of conduct, destruction of the group must be the only reasonable inference. If the evidence fits another purpose, such as expelling a population or winning territory, the court will not find genocide.

That is why atrocities with enormous death tolls can fail to meet the legal test, while a single massacre can meet it. At Srebrenica in July 1995, Bosnian Serb forces killed about 8,000 Bosniak men and boys. The International Criminal Tribunal for the former Yugoslavia ruled, in the Krstić case, that destroying the community's men in one place, knowing it would doom the community there, was intent to destroy part of the group. In later cases the tribunal held that genocidal intent elsewhere in Bosnia had not been proved beyond reasonable doubt, and convicted for crimes against humanity there instead.

Which genocides have courts ruled on?

International and national courts have found genocide in a handful of cases. Each judgment below is a court's finding, after a trial or a full hearing:

Year Court Ruling
1998 International Criminal Tribunal for Rwanda Jean-Paul Akayesu, a mayor, became the first person convicted of genocide by an international court, for the 1994 genocide of Tutsi; the court also held that rape could be an act of genocide
2004 Yugoslavia tribunal, appeals The appeals chamber confirmed that the Srebrenica killings were genocide and convicted Radislav Krstić of aiding and abetting it
2007 International Court of Justice Srebrenica was genocide; Serbia did not commit it but breached its duty to prevent it
2016–2021 Yugoslavia tribunal and its successor Radovan Karadžić and Ratko Mladić convicted of genocide at Srebrenica
2018, 2022 Khmer Rouge Tribunal, Cambodia Nuon Chea and Khieu Samphan convicted of genocide against Cambodia's Vietnamese minority, and Nuon Chea also against the Cham; Khieu Samphan's conviction upheld on appeal in 2022
2021 Frankfurt Higher Regional Court, Germany An Islamic State member convicted of genocide against the Yazidis

Many other mass killings are widely described as genocides by historians and governments, among them the Holocaust and the Armenian genocide during the Ottoman Empire's last years, without an international court judgment on them under the convention, which came later. Some cases are pending. At the International Court of Justice, In The Gambia v. Myanmar, filed in 2019 over the treatment of the Rohingya, the court has said it will give judgment on 19 November 2026, according to its case page. South Africa v. Israel, filed in December 2023, was still in its written stage: in May 2026 the court set time limits for a further round of written pleadings, its case page shows. This note describes the law and the courts' findings; it doesn't rule on any case a court has not decided, and it isn't legal advice.

The convention's promise was prevention as well as punishment, and courts and the International Criminal Court can act only after the fact. How to stop a genocide while it is happening is a question for governments and the law together, and the record of the past decades shows how rarely they have done it.

Check yourself

  • Without looking back: name the two elements every genocide charge must prove.
  • Why could a campaign that kills tens of thousands be judged a crime against humanity but not genocide?
  • What did the International Court of Justice decide about Serbia and Srebrenica in 2007?

Sources

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