Sir Frederic Calland Williams, CBE, FRS (26 June 1911 Stockport – 11 August 1977 Manchester), known as 'F.C. Williams' or (less often) 'Freddie Williams', was an English engineer. Williams attended the University of Manchester, and received his doctorate in 1936 after studying at Magdalen College, Oxford. Working at the Telecommunications Research Establishment he was a substantial contributor during World War II to the development of radar.