The National and Kapodistrian University of Athens (NKUA; Greek: Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών, Ethnikó kai Kapodistriakó Panepistímio Athinón), simply referred to as the University of Athens, is a public university in Athens, Greece, with various campuses along the Athens agglomeration.

It has been in continuous operation since its establishment in 1837 and is the oldest higher education institution of the modern Greek state and the first contemporary university in both the Balkan Peninsula and the Eastern Mediterranean. Today it is one of the largest universities by enrollment in Europe, with over 69,000 registered students.