Meghan L. O'Sullivan (born September 13, 1969) is a former deputy national security adviser on Iraq and Afghanistan. She is Jeane Kirkpatrick Professor of the Practice of International Affairs at Harvard Kennedy School and a board member of the Belfer Center for Science and International Affairs at Kennedy School. She is a member of the board of directors of the Council on Foreign Relations, and Raytheon, and the North American chair of the Trilateral Commission.