Sir Gordon Morgan Holmes (Dublin, 22 February 1876 – Farnham, 29 December 1965) was a British neurologist, best known for his pioneering research surrounding cerebellum and visual cortex.
He graduated at Trinity College, Dublin. In 1906 he was appointed Physician to the National Hospital for Neurology and Neurosurgery, Queen Square, London under John Hughlings Jackson (1835-1911), the doyen of British neurologists. In 1908 Holmes commenced collaborating with Henry Head (1861-1940). The two men complemented one another because Head was imaginative and enthusiastic as well as speculative, whereas Holmes insisted upon attention to detail and would never bend facts to fit a hypothesis. At times this led to clashes between the two, but they continued a close collaboration until the outbreak of the 1st World War, when Holmes was appointed as consultant neurologist to the British Expeditionary Forces. Working in a field hospital he had a unique opportunity for the investigation of the effects of lesions in specific regions of the brain on balance, vision and bladder function.