Dimitrios Trichopoulos (Greek: Δημήτριος Τριχόπουλος; December 9, 1938 – December 1, 2014), was a Mediterranean Diet expert and tobacco harms researcher. He was Vincent L. Gregory Professor of Cancer Prevention and Professor of Epidemiology, and a past chair of the Department of Epidemiology, in the Harvard School of Public Health in Boston. Trichopoulos also was a Member of the Athens Academy and president of the Hellenic Health Foundation in Greece. He held teaching appointments at the University of Athens Medical School and the Karolinska Institute in Sweden.