This Handbook offers a comprehensive analysis of both the nature of political ideologies and their main manifestations. The diversity of ideology studies is represented by a range of theories that illuminate the field, combined with an appreciation of the changing complexity of concrete ideologies and the emergence of new ones. The Handbook is divided into three sections: The first reflects some of the latest thinking about the development of ideology on an historical dimension, from the standpoints of conceptual history, Marx studies, social science theory and history, and leading schools of continental philosophy. The second includes some of the most recent interpretations and theories of ideology. The third focuses on the leading ideological families and traditions, as well as on some of their cultural and geographical manifestations, incorporating both historical and contemporary perspectives.