Ours is a divided world, and conflict management poses a persistent challenge at all levels—individual, institutional, organizational, societal, and global. Today, peace studies is without question a diverse and socially important field in its own right. Across the academic spectrum, undergraduates, graduates, and professors alike are interested in peace and conflict research and analysis as well as peace values and action. Government, nonprofit, and commercial organizations whose work involves peace or aggression seek information on international relations and diplomatic history. Global politics continues to take center stage in the news—in print, on the air, or online—and the general public is increasingly engaged with this set of issues. Today, the field of peace building is without question fully professionalized. Make no mistake—The Oxford International Encyclopedia of Peace fills a critical niche at a critical time. Weighing in at four volumes, the Encyclopedia is a scholarly, but accessible, comprehensive reference work that quickly distinguishes itself among related reference works in the social, life, and physical sciences. More than 850 A–Z entries signed by an impressive roster of contributors cover the full range of historical, political, theoretical, and philosophical issues relating to peace and conflict. Readers interested in major figures, events, organizations, theories, and more will not be disappointed. A bibliography for further reading accompanies each entry. Cross-references to other useful points of interest within the encyclopedia add value, as do a “Chronology of Peace in History” and appendixes (“Key Documents,” “Key Terms in Peace Research,” “Negotiation Terms,” and “Selected Key References”). The closest competing work is the groundbreaking Encyclopedia of Violence, Peace, and Conflict (Academic, 2008), which has more than 190 multidisciplinary articles. Previous works, including the four-volume World Encyclopedia of Peace (Pergamon, 1986) or a work by the same title, the World Encyclopedia of Peace (Oceana, 2d ed., 1999), although comprehensive in their time, are no longer adequate resources for the twenty-first-century student, scholar, or general adult reader interested in peace issues. The Oxford International Encyclopedia of Peace is highly recommended for academic libraries and large public libraries.