Abstract
This chapter examines the assumptions of republican theory in relation to common notions of a legitimate international order. It considers an alternative definition of a legitimate global order that makes a distinction between states, federations of states, other organisations and political communities. In this definition, republican theory defends transnational democracy as the basic structure of a legitimate global order. The chapter begins with an overview of republican political theory and its differences from other approaches. It then discusses the internal relationship between republicanism and modern statehood and shows the implications of reducing republicanism to individual states or attempting to ‘globalise’ the single republican state. Finally, it describes a model of transnational democracy that differs from the single state model.