This chapter begins by defining international economic law. It then discusses the main international economic institutions: the World Trade Organization, the International Monetary Fund and the World Bank. It goes on to elaborate on the key principles of international trade law: tariffication, binding tariffs, most favoured nation treatment and the national treatment obligation and discusses exceptions to these principles, anti-dumping and subsidies, regional trade arrangements, and developing States and dispute settlement within the WTO. The chapter also discusses the key principles of international investment law (including foreign direct investment, protection standards, expropriation and dispute settlement); the international financial architecture; and international economic law and State sovereignty.