ATHENS as a capitalized abbreviations can refer either to

• Athens (access and identity management service)   an access and identity management service for libraries in the UK
• The ATHENS Programme, an exchange network of European higher education institutions in engineering,

Athens (; , Athína [], , is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, with its recorded history spanning around 3,400 years, and the earliest human presence around the 11th–7th centuries BC. Classical Athens was a powerful city-state that emerged in conjunction with the seagoing development of the port of Piraeus. A centre for the arts, learning and philosophy, home of Plato's Academy and Aristotle's Lyceum, it is widely referred to as the cradle of Western civilization and the birthplace of democracy, largely because of its cultural and political impact on the European continent and in particular the Romans. In modern times, Athens is a large cosmopolitan metropolis and central to economic, financial, industrial, maritime, political and cultural life in Greece. In 2015, Athens was ranked the world's 29th richest city by purchasing power and the 67th most expensive in a UBS study.