This book analyzes parties beyond the national borders and their increasing institutionalization abroad, in order to understand their development, their organizational specificities, their functions, and their impact on the party system and national politics at home. With 12 contrasted case studies, it comparatively addresses a wide range of perspectives on political parties abroad and lays the foundation for a framework of analysis of political parties abroad, contributing to a better understanding of transnationalism and long-distance democracy. The generalization of overseas voting and the development of representative institutions for emigrants has transformed the civic and political links between states and their diaspora. This has also created new opportunities for political parties, with the task to reach out to citizens living abroad, mobilize them for elections, and even organize their representation at home. This book represents the first in-depth study of an emerging phenomenon. This book will be of key interest to scholars and students of political parties/party politics, immigration, and more broadly to democracy studies and comparative politics.