This chapter provides an overview of the field of Global Political Economy (GPE), also known as International Political Economy (IPE). It begins with a discussion of how GPE/IPE has developed as a major focus of study within the broader field of global politics over the last four decades. It then considers the rise of mercantilism as a theory of GPE, along with its relationship to nationalism and colonialism. It also examines the emergence of liberal political economy, Marxism and critical IPE, and the international economic order after World War II. In particular, it looks at the Bretton Woods system, which emerged after the war as a compromise between liberalism and nationalism. The chapter concludes with an analysis of international political, economic, and social problems associated with the North–South gap, globalization and regionalization in the post-Cold War period, and financial crises that rocked the global economic system.