This article explores the role of representative assemblies in the diverse territories of the early modern Spanish and Portuguese empires spanning the Americas, parts of Asia, and Africa. It begins with a concise overview of the Portuguese and Spanish representative assemblies, commonly referred to as the Cortes. The second section raises some preliminary questions about how the parliamentary culture brought by the Spanish and Portuguese to their overseas possessions shaped, and was shaped by, local understandings of political participation in institutions with a representational character. The third section examines the complex debate over the integration of representatives from overseas municipalities into the Castilian and Portuguese Cortes. The fourth and final section analyses the interaction between Iberian parliamentary culture and a range of Asian, Indigenous American, and African perspectives on participation in representative gatherings. The principal argument is that representative assemblies, the debates they generated, and their varying degrees of prominence, reflect the fundamental changes observed in the political and legal structure of the Portuguese and Spanish empires.