This book examines the concept of regional power in international relations. Using the emerging powers of India and South Africa as the case studies, it explores how regional powers simultaneously differ and share common features. The book develops a method to classify and evaluate different types of regional powers and applies this typology to contemporary case studies of India and South Africa. Regional power is often expected to have a positive influence on region-specific problems of conflict, economic deprivation and political instability. In reality, an 'achievement-expectations gap' can be seen in many regional powers, which can be analysed and understood through observable variation in regional power. The author discovers that in addition to the management of the internal regional order, regional powers have to establish individuality whilst fitting into the global international environment, altering both regional dynamics and creating variance in the level of control within the region. Elucidating concepts and definitions, this book is an accessible and in-depth study that both introduces key concepts and provides a framework for the future study of regional power in international relations. Redefining Regional Power in International Relations will be of interest to students and scholars of regionalism and international relations.