William Dobinson Halliburton FRS (21 June 1860 Middlesex – 21 May 1931 Exeter) was a British physiologist, noted for being one of the founders of the science of biochemistry.
William was one of four children (three sisters) born to Thomas Gill Halliburton and Mary Strachan Homan of Middlesex. He was educated at the University College School and later at the University College London, obtaining a BSc in 1879. On his MRCS in 1883 he was appointed Assistant in Physiology at the University College under Sir Edward Sharpey-Schafer. His MD followed in 1884, his membership of the Royal College of Physicians a year later and his Fellowship in 1892. Halliburton succeeded Gerald Francis Yeo in the chair of Physiology at King's College London in 1889. Over the period of 34 years at King's College he was deeply involved in its administration and was dean of the Faculty of Medical Science for many years. In 1923 his chronic ill-health obliged him to resign from the chair and accept the sinecure of Emeritus Professor.
During his tenure at King's College, he assembled a research team, many of whom later became distinguished clinicians, including such figures as Thomas Gregor Brodie (1866-1916), Frank S. Locke, Sir Charles James Martin (1866-1955), Sir Frederick Walker Mott (1853–1926), Walter Ernest Dixon (1871–1931), Sigmund Otto Rosenheim (1871–1955) and Corrado Donato Da Fano (1879-1927). He and Rosenheim discovered that cholesterol was not pure, but contained ergosterol which led to the formation of vitamin D under ultra-violet light. Halliburton's first laboratory was improvised in a disused corridor, but nonetheless became the meeting place of the keenest minds in the infant science of biochemistry. His early research centered on the proteins making up muscle and blood, leading to his election as a Fellow of the Royal Society in 1891. Together with Walter Ernest Dixon he studied cerebral circulation and cerebro-spinal fluid. During this time he helped found the Biochemical Society of which he was the sole honorary member.