Synopsis Modern political theories is a subject being taught in post-graduate classes in political science at Indian universities. The present book has been planned as a text-book for this comprehensive and rapidly growing subject. It deals with political theory, political analysis, behaviouralism, post-behaviouralism, concept of politics, political system, political power, authority, legitimacy, political involvement, revolution, political modernisation, political development and political culture etc. No aspect of political theory and analysis has been omitted in this book. As a comprehensive text, it is expected to cater to the needs of advanced students who are already acquainted with the broad outlines of the subject. A separate bibliography has been provided. The book will provide fruitful to all concerned, and the readers would also like to react to it by communicating their comments, criticism, and suggestions to me and help in improving upon the output. Transformation of developing societies is stupendous task, let us all join to share the burden to the best of our capacities, individually as well as collectively.