Cedric Keith Simpson CBE FRCP FRCPath (20 July 1907 – 21 July 1985) was an English forensic pathologist. He was Professor of Forensic Medicine in the University of London at Guy's Hospital, Lecturer in Forensic Medicine at the University of Oxford and a founding member and President of the Association of Forensic Medicine. Simpson became renowned for his post-mortems on high-profile murder cases, including the 1949 Acid Bath Murders committed by John George Haigh and the murder of gangster George Cornell, who was shot dead by Ronnie Kray in 1966.