Scott Douglas Sagan (born 1955) is the Caroline S.G. Munro Professor of Political Science at Stanford University and co-director of Stanford's Center for International Security and Cooperation (CISAC). He is known for his research on nuclear weapons policy and nuclear disarmament, including discussions of system accidents, and has published widely on these subjects. He currently serves as the American Academy of Arts and Sciences' Chair of the Committee on International Security Studies and on the Academy's Council.