Ogygia (//; Ancient Greek: Ὠγυγίη Ōgygíē [ɔːɡyɡíɛː], or Ὠγυγία Ōgygia [ɔːɡyɡía]), is an island mentioned in Homer's Odyssey, Book V, as the home of the nymph Calypso, the daughter of the Titan Atlas, also known as Atlantis (Ατλαντίς) in ancient Greek. In Homer's Odyssey Calypso detained Odysseus on Ogygia for 7 years and kept him from returning to his home of Ithaca, wanting to marry him. Athena complained about Calypso's actions to Zeus, who sent the messenger Hermes to Ogygia to order Calypso to release Odysseus. Hermes is Odysseus's great grandfather on his mother's side, through Autolycos. Calypso finally, though reluctantly, instructed Odysseus to build a small raft, gave him food and wine, and let him depart the island.
The Odyssey describes Ogygia as follows:
...and he (Hermes) found her within. A great fire was burning in the hearth, and from afar over the isle there was a fragrance of cleft cedar and juniper as they burned. But she within was singing with a sweet voice as she went to and fro before the loom, weaving with a golden shuttle. Round about the cave grew a luxuriant wood, alder and poplar and sweet-smelling cypress, wherein birds long of wing were wont to nest, owls and falcons and sea-crows with chattering tongues, who ply their business on the sea. And right there about the hollow cave ran trailing a garden vine, in pride of its prime, richly laden with clusters. And fountains four in a row were flowing with bright water hard by one another, turned one this way, one that. And round about soft meadows of violets and parsley were blooming... 
One possible location for Ogygia is in the Ionian Sea. Some have identified either Ogygia or Phaeacia with the putative sunken Atlantis. A long-standing tradition begun by Euhemerus in the late 4th century BC and supported by Callimachus, endorsed by modern Maltese tradition, identifies Ogygia with the island of Gozo, the second largest island in the Maltese archipelago. Aeschylus calls the Nile Ogygian, and Eustathius the Byzantine grammarian said that Ogygia was the earliest name for Egypt.
Many modern scholars are reluctant to place Ogygia or indeed any of the locations Homer describes in any existing geography, and the literary tale is acknowledged as a work of fictional mythical intent.
Geographical account by Strabo
Approximately seven centuries after Homer, the Alexandrian geographer Strabo criticized Polybius on the geography of the Odyssey. Strabo proposed that Scheria and Ogygia were located in the middle of the Atlantic Ocean.
At another instance he Polybius suppresses statements. For Homer says also, 'Now after the ship had left the river-stream of Oceanus', and, 'In the island of Ogygia, where is the navel of the sea', where the daughter of Atlas lives; and again, regarding the Phaiakians, 'Far apart we live in the wash of the waves, the farthermost of men, and no other mortals are conversant with us.' All these clearly suggest that he composed them to take place in the Atlantic Ocean."
Geographical account by Plutarch
Plutarch also gives an account of the location of Ogygia:
First I will tell you the author of the piece, if there is no objection, who begins after Homer’s fashion with, an isle Ogygian lies far out at sea, distant five days’ sail from Britain, going westwards, and three others equally distant from it, and from each other, are more opposite to the summer visits of the sun; in one of which the barbarians fable that Cronus is imprisoned by Zeus, whilst his son lies by his side, as though keeping guard over those islands and the sea, which they call ‘the Sea of Cronus. The great continent by which the great sea is surrounded on all sides, they say, lies less distant from the others, but about five thousand stadia from Ogygia, for one sailing in a rowing-galley; for the sea is difficult of passage and muddy through the great number of currents, and these currents issue out of the great land, and shoals are formed by them, and the sea becomes clogged and full of earth, by which it has the appearance of being solid.
The passage of Plutarch has created some controversy. W. Hamilton indicated the similarities of Plutarch's account on "the great continent" and Plato's location of Atlantis in Timaeus 24E – 25A. Kepler  in his Kepleri Astronomi Opera Omnia estimated that “the great continent” was America and attempted to locate Ogygia and the surrounding islands. Ruaidhrí Ó Flaithbheartaigh used Ogygia as a synonym for Ireland in the title of his Irish history, Ogygia: Seu Rerum Hibernicarum Chronologia ("Ogygia: Or a Chronological Account of Irish Events"), 1685. Wilhelm von Christ was convinced that the continent was America and states that in the 1st century sailors travelling through Iceland, Greenland, and the Baffin Region reached the North American coast.
Ogygia is associated with the Ogygian deluge and with the mythological figure Ogyges, in the sense that the word Ogygian means "primeval", "primal", and "at earliest dawn", which would suggest that Homer's Ogygia was a primeval island. However, Ogyges as a primeval, aboriginal ruler was usually sited in Boeotia, where he founded Thebes there, naming it Ogygia at the time. In another account of Ogyges, he brought his people to the area first known as Acte. That land was subsequently called Ogygia in his honor but ultimately known as Attica.
Ogygia is used by Roderick O'Flaherty as an allegory for Ireland in his book published in 1685 as Ogygia: seu Rerum Hibernicarum Chronologia & etc., in 1793 translated into English by Rev. James Hely, as "Ogygia, or a Chronological account of Irish Events (collected from Very Ancient Documents faithfully compared with each other & supported by the Genealogical & Chronological Aid of the Sacred and Profane Writings of the Globe".
- "Atlantis" means the daughter of Atlas. See entry Ατλαντίς in Liddell & Scott. See also Hesiod, Theogony, 938.
- Odyssey V.58-74
- Strabo 7.3.6, referencing Callimachus' account in relation to Euhemerus. Also, Ernle Bradford (1963), Ulysses Found'.'
- Odyssey, XII, 1
- Odyssey, I, 50
- Odyssey, VI, 204
- The original text of this passage by Strabo is: ταῦτα γὰρ πάντα φανερῶς ἐν τῷ Ἀτλαντικῷ πελάγει πλαττόμενα δηλοῦται.
- Plutarch, Concerning the Face Which Appears in the Orb of the Moon, chap. 26.
- W. Hamilton, "The Myth in Plutarch's De Facie (940F – 945D)" Classical Quarterly 28.1 (January 1934:24-30).
- Introductory notes at the Loeb Classical Library on pages 21, 22 and 23.
- Entry Ωγύγιος at Liddell & Scott
- Entry "Ogygus" in N. G. L. Hammond and H. H. Scullard, The Oxford Classical Dictionary, Second Edition, Oxford University Press: 1970.
- Entry "Ogyges" in E. H. Blakeney, ed., Smith's Smaller Classical Dictionary, Everyman's Library, London: J. M. Dent and Sons Ltd., 1937.