Elgar Research Agendas outline the future of research in a given area. Leading scholars are given the space to explore their subject in provocative ways, and map out the potential directions of travel. They are relevant but also visionary.This timely Research Agenda examines how political parties are transforming amid digital change, shifting voter alignments and growing fragmentation. Bringing together leading international scholars, it combines classic theories with innovative approaches to understand how parties organize, communicate and govern in modern democracies.Contributors analyze topics such as how parties democratize and distribute power, how digitalization and artificial intelligence reshape campaigns and communication and also how parties govern and cooperate in increasingly complex political systems. The Research Agenda bridges theory and method, linking institutionalism, rational choice and political psychology with cutting-edge technological and comparative tools, and outlines the framework of the internal, electoral and decision-making arenas of party politics.A Research Agenda for Political Parties is a crucial resource for scholars and students of political parties, comparative politics, political behavior, political communication, and legislative studies. It will also benefit journalists, researchers and political practitioners seeking a deeper understanding of the changing nature of political parties.