Daniel L. Byman (born 1967) is an American political scientist. His research focuses on terrorism, Counterterrorism and the Middle East. Byman is currently a professor in Georgetown University's Walsh School of Foreign Service and director of Georgetown's security studies program He is a former Vice-Dean of the school. Byman is Senior Advisor to the U.S. Department of State as part of the International Security Advisory Board, a senior fellow with the Transnational Threats Project at the Center for Strategic and International Studies, and the Foreign Policy Editor for Lawfare. Byman played key roles in the post 9/11 intelligence committees and in many distinguished think tanks. He was a senior fellow at the Center for Middle East Policy at the Brookings Institution. He was also the research director of the Center for Middle East Public Policy at the RAND Corporation. He is also the lead course instructor for Georgetown's massive open online course on Terrorism and Counter Terrorism.