Alexandros Papanastasiou, Greek sociologist and politician, Prime Minister of Greece (d. 1936)

Alexandros Papanastasiou (Greek: Αλέξανδρος Παπαναστασίου; 8 July 1876 – 17 November 1936) was a Greek lawyer, sociologist and politician who served twice as the Prime Minister of Greece in the interwar period, being a pioneer in the establishment of the Second Hellenic Republic.