Charles B. Curtis (born April 27, 1940) is an American lawyer, currently senior advisor (nonresident) to the Center for Strategic and International Studies, vice chair of the United States Department of State's International Security Advisory Board, 2011 through 2017, former member of the National Academies Intelligence Science and Technology Experts Group, and President Emeritus of the Nuclear Threat Initiative (NTI), a non-profit organization working to reduce the threats from nuclear, biological and chemical weapons. In addition to working in private practice for more than sixteen years, Curtis served as the last chairman of the Federal Power Commission and the first chairman of the Federal Energy Regulatory Commission from 1977 to 1981. In 1994 he was appointed and confirmed as underse