John Dixon Comrie (28 February 1875 – 2 October 1939) was a Scottish physician, historian of medicine, and the editor of the first edition of Black's Medical Dictionary.Comrie studied at George Watson's College and the University of Edinburgh, graduating with M.B. degree and first-class honours in 1899. He became Fellow of the Royal College of Physicians in 1906 and M.D. in 1911, and then worked with the Edinburgh and Glasgow Infirmaries. After that he did post-graduate studies in Berlin and Vienna, worked as clinical assistant at the National Hospital in London, and finally settled at Edinburgh, where he became known as pathologist, physician to the Royal Infirmary, and consulting physician to the Deaconess Hospital and the Princess Margaret Rose Hospital for Crippled Children. During World War I he acted as consulting physician to the North Russian Expeditionary Force, reaching the rank of Lieutenant-Colonel.His father was also John Dixon Comrie (died before October 1939).