The Odyssey (/ˈɒdɪsi/; Ancient Greek: Ὀδύσσεια, romanized: Odýsseia) is one of two major epics of ancient Greek literature attributed to Homer. It is one of the oldest surviving works of literature and remains popular with modern audiences. Like the Iliad, the Odyssey is divided into 24 books. It follows the heroic king of Ithaca, Odysseus, also known by the Latin variant Ulysses, and his homecoming journey after the ten-year long Trojan War. His journey from Troy to Ithaca lasts an additional ten years, during which time he encounters many perils and all of his crewmates are killed. In Odysseus's long absence, he is presumed dead, leaving his wife Penelope and son Telemachus to contend with a group of unruly suitors competing for Penelope's hand in marriage.

The Odyssey
Attributed to Homer
Oldest-known manuscript fragment of the Odyssey, produced in Ptolemaic Egypt during the 3rd century BC and unearthed in Medinet Ghoram
Original title	Ὀδύσσεια
Translator	See translations of the Odyssey or English translations
Composed	c. 8th century BC
Language	Homeric Greek
Genre	Epic
Form	Epic poem
Rhyme scheme	None
Lines	12,109
Preceded by	The Iliad
Metre	Dactylic hexameter
Full text
The Odyssey at Wikisource
Οδύσσεια at Greek Wikisource

The Odyssey was first composed in Homeric Greek around the 8th or 7th century BC; by the mid-6th century BC, it had become part of the Greek literary canon. In antiquity, Homer's authorship was taken as true, but contemporary scholarship predominantly assumes that the Iliad and the Odyssey were composed independently, as part of long oral traditions. Given widespread illiteracy, the poem was performed for an audience by an aoidos or rhapsode.

Key themes in the epic include the ideas of nostos (νόστος; 'return', homecoming), wandering, xenia (ξενία; 'guest-friendship'), testing, and omens. Scholars discuss the narrative prominence of certain groups within the poem, such as women and slaves, who have larger roles than in other works of ancient literature. This focus is especially remarkable when contrasted with the Iliad, which centres the exploits of soldiers and kings during the Trojan War.

The Odyssey is regarded as one of the most significant works of the Western canon. The first English translation of the Odyssey was in the 16th century. Adaptations and re-imaginings continue to be produced across a wide variety of media. In 2018, when BBC Culture polled experts around the world to find literature's most enduring narrative, the Odyssey topped the list.