Attica (Greek: Αττική, Attikí; ) is a historical region of Greece, containing Athens, the current capital of Greece. The historical region is centered on the Attic peninsula, which projects into the Aegean Sea. The modern administrative region of Greece, Attica Periphery, is more extensive than the historical region and includes several islands and part of the Peloponnese.

The history of Attica is tightly linked with that of Athens, which from the Classical period onwards, was one of the most important cities in the ancient world.

Located in the south of the country, Attica covers about 3,808 square kilometers. In addition to Athens, it contains within its area the cities of Piraeus, Eleusis, Megara, Laurium, and Marathon, as well as a small part of the Peloponnese peninsula and the islands of Salamis, Aegina, Poros, Hydra, Spetses, Kythira, and Antikythera. About 3,750,000 people live in the region, of which more than 95% are inhabitants of the Athens metropolitan area.

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