Laurence Glynn Williams, OBE, FREng, FIMechE (born 14 March 1946) is a British nuclear engineer, health and safety expert, and academic. He specialises in nuclear safety and security. From 1998 to 2005, he was Her Majesty's Chief Inspector of Nuclear Installations. From 2010 to 2014, he was Professor of Nuclear Safety and Regulation at the University of Central Lancashire. He has served as Chairman of the Committee on Radioactive Waste Management in the Department of Energy and Climate Change since 2012, and Chairman of the Defence Nuclear Safety Committee in the Ministry of Defence since 2013. He has been described as "one of the world's leading experts in nuclear safety regulation".