This article is about international criminal law and crimes against international law. For crimes that have actual or potential effect across national borders, see Transnational crime.

International criminal law is a body of public international law designed to prohibit certain categories of conduct commonly viewed as serious atrocities and to make perpetrators of such conduct criminally accountable for their perpetration. The core crimes under international law are genocide, war crimes, crimes against humanity, and the crime of aggression. This article also discusses crimes against international law, which may not be part of the body of international criminal law.