The author discusses the responsibility of International Organizations under international law. With the help of two case studies (the proposed relocation of a refugee camp involving the United Nations High Commissioner for Refugees and a water project involving, amongst others, the World Bank), the chapter discusses three central elements of international responsibility: obligation, attribution and causation. It concludes that, often enough, allegations concerning the responsibility of international organizations owe much to opportunism. Since the current legal regime is not very helpful, responsibility claims flow like water: they flow wherever they can, relatively independent from obligation, attribution and causation.