Sir Sydney Alfred Smith CBE OPR FRSE LLD (4 August 1883 in Roxburgh, New Zealand – 8 May 1969 in Edinburgh, Scotland), was a renowned forensic scientist and pathologist. From 1928 to 1953, Smith was Regius Professor of Forensic Medicine at the University of Edinburgh, a well-known forensic department of that time. Smith's popular 1959 autobiography, Mostly Murder, has run through many British and American editions, the latest in 1988.