Angeliki E. Laiou (Greek: Αγγελική Λαΐου; Athens, 6 April 1941 – Boston, 11 December 2008) was a Greek-American Byzantinist and politician. She taught at the University of Louisiana, Harvard University, Brandeis University, and Rutgers University. She was the Dumbarton Oaks Professor of Byzantine Studies at Harvard University from 1981 until her death. From 2000 to 2002, she was also a member of the Hellenic Parliament for the Panhellenic Socialist Movement (PASOK): she served as Deputy Secretary of Foreign Affairs for six months in 2000.