Here is the fourth, corrected and 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 1800 terms. It contains the basic concepts used in describing and explaining conflicts in 17 sciences that study them: military affairs, geography, art history, history, cultural studies, medicine, pedagogy, political sciences, jurisprudence, psychology, sociobiology, sociology, technical sciences, philology, physical and mathematical sciences, philosophy and economics.