Armando Manuel de Barros Serra Marques Guedes (born September 9, 1952 in Lisbon, Portugal) is a political scientist, anthropologist and a former diplomat with expertise in international relations, political science, theory and philosophy, diplomacy, security and defence, and geopolitics.
He is a professor of political science, law, and international politics at the Universidade Nova de Lisboa, as well as the professor responsible for geopolitics at the Instituto Universitário Militar, Instituto de Estudos Superiores Militares (IUM – IESM, the Portuguese Joint Higher Command and Staff College).