Zeus ( ; in Greek: nominative: Zeús, genitive: Diós) in Greek mythology is the king of the gods, the ruler of Mount Olympus, and the god of the sky and thunder. His symbols are the thunderbolt, eagle, bull and the oak. In addition to his Indo-European inheritance, the classical "cloud-gatherer" Zeus also derives certain iconographic traits from the cultures of the ancient Near East, such as the scepter. Zeus is frequently depicted by Greek artists in one of two poses: standing, striding forward, a thunderbolt leveled in his raised right hand, or seated in majesty.

Zeus was the child of Cronus and Rhea, and the youngest of his siblings. In most traditions he was married to Hera, although at the oracle of Dodona his consort was Dione: according to the Iliad, he is the father of Aphrodite by Dione. He is known for his erotic escapades, including one pederastic relationship with Ganymede. These resulted in many famous offspring, including Athena, Apollo and Artemis, Hermes, Persephone (by Demeter), Dionysus, Perseus, Heracles, Helen, Minos, and the Muses (by Mnemosyne); by Hera he is usually said to have fathered Ares, Hebe and Hephaestus.

His Roman counterpart was Jupiter, and his Etruscan counterpart was Tinia.