Katharine Ellen Sykes (born 20 December 1966) is a British physicist, broadcaster and Professor of Sciences and Society at the University of Bristol. She was previously Collier Professor of Public Engagement in Science and Engineering, from 2002 to 2006. She has presented various BBC2 and Open University TV series, including Rough Science, Ever Wondered about Food, Alternative Therapies. Alternative Medicine and presented for the documentary television miniseries Brave New World with Stephen Hawking in 2011.