Major General Sir William Dudley Duncan Refshauge, AC, CBE, ED, FRSH, FRCOG (3 April 1913 – 27 May 2009) was an Australian soldier and public health administrator. He was Honorary Physician to Queen Elizabeth II (1955–64), Director-General of the Australian Government Department of Health (1960–73), and Secretary-General of the World Medical Association (1973–76).