20th-century Scottish medical doctors

Archibald Joseph Cronin (19 July 1896 – 6 January 1981), known as A. J. Cronin, was a Scottish physician and novelist. His best-known novel is The Citadel (1937), about a Scottish doctor who serves in a Welsh mining village before achieving success in London, where he becomes disillusioned about the venality and incompetence of some doctors. Cronin knew both areas, as a medical inspector of mines and as a doctor in Harley Street. The book exposed unfairness and malpractice in British medicine and helped to inspire the National Health Service. The Stars Look Down, set in the North East of England, is another of his best-selling novels inspired by his work among miners. Both novels have been filmed, as have Hatter's Castle, The Keys of the Kingdom and The Green Years. His 1935 novella Country Doctor inspired a long-running BBC radio and TV series, Dr. Finlay's Casebook (1962–1971), set in the 1920s. There was a follow-up series in 1993–1996.

John Boyd Orr, 1st Baron Boyd-Orr, (23 September 1880 – 25 June 1971), styled Sir John Boyd Orr from 1935 to 1949, was a Scottish teacher, medical doctor, biologist, nutritional physiologist, politician, businessman and farmer who was awarded the Nobel Peace Prize for his scientific research into nutrition and his work as the first Director-General of the United Nations Food and Agriculture Organization (FAO).
He was the co-founder and the first President (1960–1971) of the World Academy of Art and Science (WAAS). In 1945, he was elected President of the National Peace Council and was President of the World Union of Peace Organisations and the World Movement for World Federal Government.

John James Rickard Macleod, (6 September 1876 – 16 March 1935), was a Scottish biochemist and physiologist. He devoted his career to diverse topics in physiology and biochemistry, but was chiefly interested in carbohydrate metabolism. He is noted for his role in the discovery and isolation of insulin during his tenure as a lecturer at the University of Toronto, for which he and Frederick Banting received the 1923 Nobel prize in Physiology or Medicine.

Lyall Stuart Scott FRCSED, FRCSGLAS (22 September 1920 – 8 October 1977) was a Scottish consultant surgeon who specialised in urology.

Sir David Percival Dalbreck Wilkie, (5 November 1882 – 28 August 1938), known to friends and colleagues as DPD, was among the first of the new breed of professors of surgery appointed at a relatively young age to develop surgical research and undergraduate teaching. At the University of Edinburgh, he established a surgical research laboratory from which was to emerge a cohort of young surgical researchers destined to become the largest dynasty of surgical professors yet seen in the British Isles. He is widely regarded as the father of British academic surgery.

Isaac Claude Michaelson (Hebrew: יצחק קלוד מייכלסון, 1903 – June 16, 1982) was an Israeli ophthalmologist and member of the Israel Academy of Sciences and Humanities.

Sir Robin MacGregor Murray FRS (born 31 January 1944 in Glasgow) is a Scottish psychiatrist, Professor of Psychiatric Research at the Institute of Psychiatry, King's College London. He has treated patients with schizophrenia and bipolar illness referred to the National Psychosis Unit of the South London and Maudsley NHS Trust because they fail to respond to treatment, or cannot get appropriate treatment, locally; he sees patients privately if they are unable to obtain an NHS referral.

Donald McIntyre FRSE MBE MID (1891-1954) was a 20th-century Scottish gynecologist and medical author.

Samuel James Cameron (7 January 1878 – 29 October 1959) was Regius Professor of Midwifery at the University of Glasgow from 1934 until 1942. The son of Caesarean Section pioneer Prof Murdoch Cameron, S.J. Cameron was a foundation Fellow of Royal College of Obstetricians and Gynaecologists in 1929, and for many years a member of the Gynaecological Visiting Society. A lifelong champion of the reputation of the founder of professional midwifery in the British isles, William Smellie, Cameron both named a maternity hospital at Lanark, Scotland, after him and saved Smellie's library from permanent loss.

Sir Thomas Drummond Shiels MC MB ChB (7 August 1881 – 1 January 1953) was a Scottish Labour politician.