This book is a comparative study of terrorism and counterterrorism in Saudi Arabia and Indonesia. It explores the history and contemporary developments of terrorism, especially Islamist terrorism, in these two Sunni Muslim-majority countries. In doing so, it analyzes the strengths and weaknesses of governments’ policies, strategies, and models of counterterrorism, including terrorist rehabilitation and reintegration programs. In addition, the book also documents the opinions of Saudis and Indonesians to find societal voices on effective ways of combating violent extremism and discusses Saudi-Indonesian cooperation on counterterrorism, defense, and security issues. The book suggests that although particular Islamic texts, teachings, and discourses might influence radical behaviors and practices of some Muslim individuals and groupings, terrorism is beyond ideological, religious, and doctrinal issues. Therefore, multiple methods and strategies are needed to combat radicalism and create sustainable peace in society. The work will be is beneficial for both academic and non-academic communities, particularly students of conflict, violence, peacebuilding, and religious studies.