Archibald Joseph Cronin, MB, ChB, MD, DPH, MRCP (19 July 1896 – 6 January 1981) was a Scottish novelist and physician. His best-known works are Hatter’s Castle, The Stars Look Down, The Citadel, The Keys of the Kingdom and The Green Years, all of which were adapted to film. He also created the Dr. Finlay character, the hero of a series of stories that served as the basis for the popular BBC television and radio series entitled Dr. Finlay’s Casebook.