John Bishop Harman, FRCS, FRCP (10 August 1907 – 13 November 1994) was a British physician, president of the Medical Defence Union and chairman of the British National Formulary. He was also notable as a medical expert witness for the defence in the trial of suspected serial killer John Bodkin Adams. His daughter, Harriet Harman, is a senior Labour Party politician.
Harman was born at 108 Harley Street, the heart of medical London, and practised and lived there his whole life. His father, Nathaniel, trained as a Baptist minister but gained a double first at Cambridge and became an ophthalmic consultant. His mother was Katherine Chamberlain, a niece of politician Joseph Chamberlain, and thus cousin to Austen and Neville. Katherine also qualified as a doctor but devoted herself to her family instead. Both his parents were committed Unitarians, his mother by birth and his father by conversion before marriage; his mother gave a substantial sum of money towards the reconstruction of the headquarters building known as Essex Hall. His eldest sibling grew up to be a historian and writer, best known under her married name as Elizabeth Pakenham, Countess of Longford.