What Is Genocide Under International Law?

Reviewed 18 September 2026. This is an evergreen explainer; case-specific legal findings should be checked against the newest authoritative source.

In short: Genocide has a specific legal definition centred on intent to destroy a protected group. This explainer separates that test from the wider political use of the word.

Genocide is one of the gravest crimes in international law, but it is also one of the most frequently used labels in political argument. The legal definition is specific. It requires both a prohibited act and a particular intent: the intent to destroy, in whole or in part, a protected group as such.

Which groups are protected?

The Genocide Convention and Rome Statute refer to national, ethnical, racial and religious groups. The legal list does not simply cover every political, social or cultural group. Whether a population falls within a protected category can itself become a legal question in a particular case.

Which acts are listed?

The prohibited acts are killing members of the group; causing serious bodily or mental harm; deliberately inflicting conditions of life calculated to bring about physical destruction in whole or in part; imposing measures intended to prevent births; and forcibly transferring children of the group to another group. The acts must be connected to the required genocidal intent.

The special intent is what distinguishes genocide

Large-scale killing, forced displacement or severe abuse can constitute other international crimes without necessarily constituting genocide. Prosecutors must establish the specific intent to destroy the protected group, in whole or in substantial part, as such. Courts may infer intent from patterns and circumstances, but the inference must meet the applicable legal standard.

Genocide can occur in war or peace

Like crimes against humanity, genocide is not legally confined to armed conflict. It can be prosecuted whether committed in wartime or peacetime if the elements are satisfied.

Courts can address genocide in different ways

The International Criminal Court prosecutes individuals where it has jurisdiction. The International Court of Justice decides disputes between States, including disputes under the Genocide Convention where jurisdiction exists. Domestic courts may also prosecute genocide under national law. These processes ask different questions and can reach different types of legal conclusions.

Why reporting should distinguish allegation from finding

Governments, activists, scholars, UN experts and litigants may use the term before a court has ruled. Their assessments can be newsworthy, but a legal allegation is not the same as a final judicial determination. CAWT attributes the claim and identifies the institution, standard and procedural stage involved.

Frequently asked questions

Does genocide require mass killing?

No. Killing is one of five listed acts. Other acts can qualify if they are committed with the required intent.

Is ethnic cleansing the same legal crime as genocide?

No. “Ethnic cleansing” is a descriptive term rather than a standalone crime in the Rome Statute. Conduct described that way may amount to genocide, crimes against humanity or war crimes depending on the facts and intent.

Can the ICJ convict a person of genocide?

No. The ICJ deals with State responsibility and disputes between States; individual criminal responsibility is handled by criminal courts such as the ICC or domestic courts.