This textbook provides an introduction to the international relations and security environment of the contemporary Asia-Pacific. The international team of expert authors introduce security studies concepts and terminology, examine the key actors in the region, explore in-depth the traditional and non-traditional security challenges, and frame the Asia-Pacific's international politics through several different international relations theories. Major topics covered include U.S.-China relations, India and Japan's changing roles, middle powers and small states, the possibility of arms races, maritime security, terrorism and transnational crime, human security, and technology and security. Asia-Pacific Security is written accessibly for undergraduate or Master's students who are studying the region for the first time, and the book is intended to be a core text for courses relating to security studies or the international relations of the region. Special features for students include chapter summaries, study questions, guides to further reading, and an extensive glossary.