Athens serves as the capital and largest city of Greece, situated within the Attica region. It holds the distinction of being the southernmost capital on the European mainland and a significant coastal urban area in the Mediterranean. Administratively, the Municipality of Athens constitutes a small unit within the broader urban agglomeration, covering a land area of 38.96 square kilometres. The city acts as the central hub for economic, financial, industrial, maritime, political, and cultural life throughout the nation.

The city boasts recorded history spanning over 3,400 years, with earliest human presence dating between the 11th and 7th millennia BC. Classical Athens emerged as a powerful city-state and centre for democracy, arts, and philosophy, influencing the Hellenistic world and ancient Rome. It is often regarded as the cradle of Western civilisation. The heritage of the Classical Era remains evident in ancient monuments, with the Acropolis of Athens and the medieval Daphni Monastery recognised as UNESCO World Heritage Sites.

Athens is a large cosmopolitan metropolis defined by its historical urban core and modern districts. Central Athens contains most ancient sites and museums, while North, West, and South Athens offer residential areas, malls, and beaches. The port of Piraeus serves as the main maritime hub. Key landmarks include the Parthenon, considered a key landmark of early Western culture, alongside Roman, Byzantine, and Ottoman monuments that demonstrate continuity through millennia of history.

The city hosts several major cultural institutions, including the National Archeological Museum, which features the world's largest collection of ancient Greek antiquities. It is home to the Acropolis Museum, the Museum of Cycladic Art, the Benaki Museum, and the Byzantine and Christian Museum. Athens was the host city for the first modern-day Olympic Games in 1896 and later hosted the 2004 Summer Olympics, drawing visitors interested in its rich athletic and artistic traditions.

The Municipality of Athens had a population of 643,452 in 2021 within its official limits. The wider metropolitan area had a population of 3,638,281 in 2021 over an area of 2,928.717 square kilometres. It is classified as a Beta (+) status global city and one of the biggest economic centres in Southeast Europe. Its port Piraeus is the second-busiest passenger port in Europe and the thirteenth-largest container port in the world.