Archibald Joseph Cronin, MBChB, MD, DPH, MRCP (19 July 1896 – 6 January 1981) was a Scottish novelist and physician.
His best-known novel is The Citadel (1937), the story of a doctor from a Welsh mining village who quickly moves up the career ladder in London. Cronin had observed this scene closely as a Medical Inspector of Mines and later as a doctor in Harley Street. The book promoted what were then controversial new ideas about medical ethics and helped to inspire the launch of the National Health Service. Another popular mining novel of Cronin's, set in the North East of England, is The Stars Look Down. Both these novels have been adapted as films, as have Hatter's Castle, The Keys of the Kingdom and The Green Years. Cronin's novella Country Doctor was adapted as a long-running BBC radio and TV series Dr Finlay's Casebook, revived many years later.
He is also known as Archibald Joseph Cronin.