Sir Robert Muir (5 July 1864 – 30 March 1959) was a Scottish physician and pathologist who carried out pioneering work in immunology, and was one of the leading figures in medical research in Glasgow in the early 20th century.

[4] On 21 June 1933, in Saint John, New Brunswick, Muir gave a talk at the 64th Annual Meeting of the Canadian Medical Association.

His proposers were William Smith Greenfield, Cargill Gilston Knott, Arthur Robinson and James Hartley Ashworth.

In the First World War he served as a Lieutenant Colonel in the Royal Army Medical Corps, overseeing pathological and bacteriological work at Scottish hospitals.

He is buried with his sister, artist Anne Davidson Muir, in the northern 20th-century extension to Dean Cemetery in western Edinburgh.

His publications included an early collection of papers on immunology, Studies in Immunity (1909, London, Oxford University Press), followed by Text-book of Pathology (1924).