Lieutenant-Colonel Charles Ruthven Bickerton Blackburn AC (7 May 1913 – 12 April 2016) was a professor of medicine at the University of Sydney. His father was Lieutenant-Colonel Sir Charles Bickerton Blackburn KCMG, OBE (22 April 1874 – 20 July 1972), an Australian university chancellor and physician. During World War II Ruthven was Commanding and Senior Physician of the Land Headquarters Medical Research Unit (LHQ, 1MRU), Australian Army Medical Corps (AAMC). In 1940 he married Nell. (Eleanor Freeman 1916–1967.) They had two daughters, Susan Ann and Sandra.