Water is the lifeblood of human beings and society, but threats to water, such as the pollution of rivers, cyber crimes, and attacks against water infrastructure, are increasing. In green criminology, scholars have relied on domestic criminal law to develop the concept of crimes against water. This paper argues that international law could provide several frameworks for addressing these crimes. A number of international treaties and customary rules deal directly or indirectly with crimes against water, and the United Nations Security Council has also dealt with crimes against water committed by terrorist groups and parties to armed conflict. Crimes against water may represent violations not only of domestic criminal laws but also of international humanitarian law and human rights law.