Stathis N. Kalyvas is a Greek political scientist who is the Gladstone Professor of Government at All Souls College, Oxford. He has held professoral positions at Yale University (from 2003 to 2017), as well as the University of Chicago, New York University, and Ohio State University, as well as conducted research at the Peace Research Institute Oslo. He has written extensively on civil wars, ethnicity, and political violence. He wrote The Logic of Violence in Civil War.