Joseph S. Francisco (born 26 March 1955) is an American scientist and the former president of the American Chemical Society from 2009 to 2010. He currently serves as the President's Distinguished Professor of Earth and Environmental Science and professor of chemistry at the University of Pennsylvania. He was the Dean of the College of Arts and Sciences, and held  the Elmer H. and Ruby M. Cordes Chair in chemistry at the University of Nebraska in Lincoln until 2018.