Stephen S. Morse (born November 22, 1951) is an American epidemiologist, influenza researcher and specialist on emerging infectious diseases, who has served as an adviser on the epidemiology of infectious diseases and on improving disease early warning systems to numerous government and international organizations. As of 2016, he is Professor of Epidemiology at the Mailman School of Public Health of Columbia University. His seminal book Emerging Viruses (1993) was selected by American Scientist for its list of "100 Top Science Books of the 20th Century".