Athena or Athene, often given the epithet Pallas, is an ancient Greek goddess associated with wisdom, warfare, and handicraft who was later syncretized with the Roman goddess Minerva. Athena was regarded as the patron and protectress of various cities across Greece, particularly the city of Athens, from which she most likely received her name. The Parthenon on the Acropolis of Athens is dedicated to her. Her major symbols include owls, olive trees, snakes, and the Gorgoneion. In art, she is generally depicted wearing a helmet and holding a spear.

From her origin as an Aegean palace goddess, Athena was closely associated with the city. She was known as Polias and Poliouchos (both derived from polis, meaning "city-state"), and her temples were usually located atop the fortified acropolis in the central part of the city. The Parthenon on the Athenian Acropolis is dedicated to her, along with numerous other temples and monuments. As the patron of craft and weaving, Athena was known as Ergane. She was also a warrior goddess, and was believed to lead soldiers into battle as Athena Promachos. Her main festival in Athens was the Panathenaia, which was celebrated during the month of Hekatombaion in midsummer and was the most important festival on the Athenian calendar.

In Greek mythology, Athena was believed to have been born from the forehead of her father Zeus. In almost all versions of the story, Athena has no mother and is born from Zeus' forehead by parthenogenesis. In a few others, such as Hesiod's Theogony, Zeus swallows his consort Metis, who was pregnant with Athena; in this version, Athena is first born within Zeus and then escapes from his body through his forehead. In the founding myth of Athens, Athena bested Poseidon in a competition over patronage of the city by creating the first olive tree. She was known as Athena Parthenos "Athena the Virgin". In one archaic Attic myth, Hephaestus tried and failed to rape her, resulting in Gaia giving birth to Erichthonius, an important Athenian founding hero Athena raised. She was the patron goddess of heroic endeavor; she was believed to have aided the heroes Perseus, Heracles, Bellerophon, and Jason. Along with Aphrodite and Hera, Athena was one of the three goddesses whose feud resulted in the Trojan War. She plays an active role in the Iliad, in which she assists the Achaeans and, in the Odyssey, she is the tutelary deity to Odysseus.

In the later writings of the Roman poet Ovid, Athena was said to have competed against the mortal Arachne in a weaving competition, afterward transforming Arachne into the first spider, and to have transformed Medusa into the Gorgon after witnessing the young woman being raped by Poseidon in the goddess's temple. Ovid also says that Athena saved the mortal maiden Corone from the same god by transforming her into a crow. Since the Renaissance, Athena has become an international symbol of wisdom, the arts, and classical learning. Western artists and allegorists have often used Athena as a symbol of freedom and democracy.

Athena is associated with the city of Athens. The name of the city in ancient Greek is Ἀθῆναι (Athȇnai), a plural toponym, designating the place where—according to myth—she presided over the Athenai, a sisterhood devoted to her worship. In ancient times, scholars argued whether Athena was named after Athens or Athens after Athena. Now scholars generally agree that the goddess takes her name from the city; the ending -ene is common in names of locations, but rare for personal names. Testimonies from different cities in ancient Greece attest that similar city goddesses were worshipped in other cities and, like Athena, took their names from the cities where they were worshipped. For example, in Mycenae there was a goddess called Mykene, whose sisterhood was known as Mykenai, whereas at Thebes an analogous deity was called Thebe, and the city was known under the plural form Thebai (or Thebes, in English, where the 's' is the plural formation). The name Athenai is likely of Pre-Greek origin because it contains the presumably Pre-Greek morpheme *-ān-.

In his dialogue Cratylus, the ancient Greek philosopher Plato (428–347 BC) gives some rather imaginative etymologies of Athena's name, based on the theories of the ancient Athenians and his etymological speculations:

That is a graver matter, and there, my friend, the modern interpreters of Homer may, I think, assist in explaining the view of the ancients. Most of these in their explanations of the poet, assert that he meant by Athena "mind" [νοῦς, noũs] and "intelligence" [διάνοια, diánoia], and the maker of names appears to have had a singular notion about her; and indeed calls her by a still higher title, "divine intelligence" [θεοῦ νόησις, theoũ nóēsis], as though he would say: This is she who has the mind of God [ἁ θεονόα, a theonóa]. Perhaps, however, the name Theonoe may mean "she who knows divine things" [τὰ θεῖα νοοῦσα, ta theia noousa] better than others. Nor shall we be far wrong in supposing that the author of it wished to identify this Goddess with moral intelligence [εν έθει νόεσιν, en éthei nóesin], and therefore gave her the name Etheonoe; which, however, either he or his successors have altered into what they thought a nicer form, and called her Athena.

— Plato, Cratylus 407b