Publius Ovidius Naso (Latin: [ˈpuːbliʊs ɔˈwɪdiʊs ˈnaːsoː]; 20 March 43 BC – AD 17/18), known in English as Ovid (/ˈɒvɪd/ OV-id), was a Roman poet who lived during the reign of Augustus. He was a younger contemporary of Virgil and Horace, with whom he is often ranked as one of the three canonical poets of Latin literature. The Imperial scholar Quintilian considered him the last of the Latin love elegists. Although Ovid enjoyed enormous popularity during his lifetime, the emperor Augustus exiled him to Tomis, the capital of the newly organised province of Moesia, on the Black Sea, where he remained for the last nine or ten years of his life. Ovid himself attributed his banishment to a carmen et error ("poem and a mistake"), but his reluctance to disclose specifics has resulted in much speculation among scholars.

Ovid is most famous for the Metamorphoses, a continuous mythological narrative in fifteen books written in dactylic hexameters. He is also known for works in elegiac couplets such as Ars Amatoria ("The Art of Love") and Fasti. His poetry was much imitated during Late Antiquity and the Middle Ages, and greatly influenced Western art and literature. The Metamorphoses remains one of the most important sources of classical mythology today.

Ovid wrote more about his own life than most other Roman poets. Information about his biography is drawn primarily from his poetry, especially Tristia 4.10, which gives a lengthy autobiographical account of his life. Other sources include Seneca the Elder and Quintilian.

Ovid was born in the Paelignian town of Sulmo (modern-day Sulmona, in the province of L'Aquila, Abruzzo), in an Apennine valley east of Rome, to an important equestrian family, the gens Ovidia, on 20 March 43 BC – a significant year in Roman politics. Along with his brother, who excelled at oratory, Ovid was educated in rhetoric in Rome under the teachers Arellius Fuscus and Porcius Latro.

His father wanted him to study rhetoric so that he might practice law. According to Seneca the Elder, Ovid tended to the emotional, not the argumentative pole of rhetoric. Following the death of his brother at 20 years of age, Ovid renounced law and travelled to Athens, Asia Minor, and Sicily. He held minor public posts, as one of the tresviri capitales, as a member of the Centumviral court and as one of the decemviri litibus iudicandis, but resigned to pursue poetry probably around 29–25 BC, a decision of which his father apparently disapproved.

Ovid's first recitation has been dated to around 25 BC, when he was eighteen. He was part of the circle centered on the esteemed patron Marcus Valerius Messalla Corvinus, and likewise seems to have been a friend of poets in the circle of Maecenas. In Tristia 4.10.41–54, Ovid mentions friendships with Macer, Propertius, Ponticus and Bassus, and claims to have heard Horace recite. He only barely met Virgil and Tibullus, a fellow member of Messalla's circle, whose elegies he admired greatly.

He married three times and had divorced twice by the time he was thirty. He had one daughter and grandchildren through her. His last wife was connected in some way to the influential gens Fabia and helped him during his exile in Tomis (now Constanța in Romania).

Ovid spent the first 25 years of his literary career primarily writing poetry in elegiac meter with erotic themes. The chronology of these early works is not secure, but scholars have established tentative dates. His earliest extant work is thought to be the Heroides, letters of mythological heroines to their absent lovers, which may have been published in 19 BC, although the date is uncertain as it depends on a notice in Am. 2.18.19–26 that seems to describe the collection as an early published work.