Andreas Georgiou Papandreou (Greek: Ανδρέας Γεωργίου Παπανδρέου, pronounced [anˈðreas papanˈðreu]; 5 February 1919 – 23 June 1996) was a Greek economist, politician and a dominant figure in Greek politics, known for founding the political party PASOK, which he led from 1974 to 1996. He served two terms as prime minister of Greece.

Papandreou's party win in the 1981 election was a milestone in the political history of Greece, since it was the first time that the elected government had a predominantly socialist political program. The achievements of his first two governments include the official recognition of the leftist and communist resistance groups of the Greek Resistance (EAM/ELAS) against the Axis occupation, the establishment of the National Health System and the Supreme Council for Personnel Selection (ASEP), the passage of Law 1264/1982 which secured the right to strike and greatly improved the rights of workers, the constitutional amendment of 1985–1986 which strengthened parliamentarism and reduced the powers of the indirectly-elected president, the conduct of an assertive and independent Greek foreign policy, the expansion in the power of local governments, many progressive reforms in Greek law and the granting of permission to the refugees of the Greek Civil War, of Greek ethnicity, to return home in Greece.The Panhellenic Socialist Movement (PASOK), which he founded and led, was the first non-communist political party in Greek history with a mass-based organization, introducing an unprecedented level of political and social participation in Greek society. In a poll conducted by Kathimerini in 2007, 48% of those polled called Papandreou the "most important Greek Prime Minister". In the same poll, the first four years of Papandreou's government after Metapolitefsi were voted as the best government Greece ever had. His father, Georgios Papandreou, and his son, George Papandreou have both also served as Prime Ministers of Greece.