James Delamere Lafferty (April 28, 1849 – July 29, 1920) was a Canadian physician and politician. Lafferty served as Registrar for the Northwest Territories Medical Ordinance regulator to professionalize the practice of medicine. he was actively involved in establishing the College of Physicians and Surgeons of Alberta and the Canadian Medical Association's Alberta Division, which was later known as the Alberta Medical Association. He served one term as the fifth mayor of Calgary from January 1890 to January 1891.