Here is a new, supplemented edition of the first dictionary on conflictology in Russian science. In it, the authors summarized the works of domestic and foreign scientists on the development of the conceptual and categorical apparatus of this interdisciplinary branch of knowledge. The dictionary presents a system of basic concepts of conflictology, including more than 1700 terms. It includes the basic concepts used in describing and explaining conflicts in 16 sciences that study them: military affairs, geography, art history, medicine, history, pedagogy, political sciences, jurisprudence, psychology, sociobiology, sociology, technical sciences, philology, physical and mathematical sciences, philosophy and economics. The book is intended for teachers of conflictology, scientists who study conflicts, students, as well as all those who are interested in this problem.