Ernst Ludwig Wynder (April 30, 1922 – July 14, 1999) was an American epidemiology and public health researcher who studied the health effects of smoking tobacco. His and Evarts Ambrose Graham's joint publication of "Tobacco Smoking as a Possible Etiologic Factor in Bronchiogenic Carcinoma: A Study of 684 Proved Cases" appeared in the Journal of the American Medical Association. It was one of the first major scientific publications to identify smoking as a contributory cause of lung cancer.