Publius Vergilius Maro (Classical Latin: [ˈpuːbliʊs wɛrˈɡɪliʊs ˈmaroː]; 15 October 70 BC – 21 September 19 BC), usually called Virgil or Vergil (/ˈvɜːrdʒɪl/ VUR-jil) in English, was an ancient Roman poet of the Augustan period. He composed three of the most famous poems in Latin literature: the Eclogues (or Bucolics), the Georgics, and the epic Aeneid. Some minor poems, collected in the Appendix Vergiliana, were attributed to him in ancient times, but modern scholars regard these as spurious, with the possible exception of some short pieces.

Already acclaimed in his lifetime as a classic author, Virgil rapidly replaced Ennius and other earlier authors as a standard school text, and stood as the most popular Latin poet through late antiquity, the Middle Ages, and early modernity, exerting major influence on Western literature. Geoffrey Chaucer assigned Virgil a uniquely prominent position in history in The House of Fame (1374–85), describing him as standing on a pilere / that was of tinned yren clere ("on a pillar that was of bright tin-plated iron"), and in the Divine Comedy, in which Virgil appears as the author's guide through Hell and Purgatory, Dante pays tribute to Virgil with the words tu se' solo colui da cu'io tolsi / lo bello stile che m'ha fatto onore (Inf. I.86–7) ("thou art alone the one from whom I took the beautiful style that has done honour to me"). In the 20th Century, T. S. Eliot famously began a lecture on the subject "What Is a Classic?" by asserting as self-evidently true that "whatever the definition we arrive at, it cannot be one which excludes Virgil – we may say confidently that it must be one which will expressly reckon with him."

Biographical information about Virgil is transmitted chiefly in vitae ("lives") of the poet, prefixed to commentaries on his work by Probus, Donatus, and Servius. The life given by Donatus is considered to closely reproduce the life of Virgil from a lost work of Suetonius on the lives of famous authors, just as Donatus used it for the poet's life in his commentary on Terence, where Suetonius is explicitly credited. The far shorter life given by Servius likewise seems to be an abridgement of Suetonius except for one or two statements. Varius is said to have written a memoir of his friend Virgil, and Suetonius likely drew on this lost work and other sources contemporary with the poet. A life written in verse by the grammarian Phocas (probably active in the 4th to 5th centuries AD) differs in some details from Donatus and Servius. Henry Nettleship believed the life attributed to Probus may have drawn independently from the same sources as Suetonius, but it is attributed by other authorities to an anonymous author of the 5th or 6th century AD who drew on Donatus, Servius, and Phocas. The Servian life was the principal source of Virgil's biography for medieval readers, while the Donatian life enjoyed a more limited circulation, and the lives of Phocas and Probus remained largely unknown.

Although the commentaries record much factual information about Virgil, some of their evidence can be shown to rely on allegorizing and on inferences drawn from his poetry. For this reason, details regarding Virgil's life story are considered somewhat problematic.

According to the ancient vitae, Publius Vergilius Maro was born on the Ides of October during the consulship of Pompey and Crassus (15 October 70 BC) in the village of Andes, near Mantua in Cisalpine Gaul (northern Italy, added to Italy proper during his lifetime). The Donatian life reports that some say Virgil's father was a potter, but most say he was an employee of an apparitor named Magius, whose daughter he married. According to Phocas and Probus, the name of Virgil's mother was Magia Polla. The cognomen of Virgil's maternal family, Magius, and failure to distinguish the genitive form of this rare name (Magi) in Servius' life, from the genitive magi of the noun magus ("magician"), probably contributed to the rise of the medieval legend that Virgil's father was employed by a certain itinerant magician, and that Virgil was a magician.

Analysis of his name has led some to believe he descended from earlier Roman colonists. Modern speculation is not supported by narrative evidence from his writings or later biographers.

A tradition of obscure origin, which was accepted by Dante, identifies Andes with modern Pietole, two or three miles southeast of Mantua. The ancient biography attributed to Probus records that Andes was thirty Roman miles (about 45 kilometres or 28 miles) from Mantua. There are eight or nine references to the gens to which Vergil belonged, gens Vergilia, in inscriptions from Northern Italy. Out of these, four are from townships remote from Mantua, three appear in inscriptions from Verona, and one in an inscription from Calvisano, a votive offering to the Matronae (a group of deities) by a woman called Vergilia, asking the goddesses to deliver from danger another woman, called Munatia. A tomb erected by a member of the gens Magia, to which Virgil's mother belonged, is found at Casalpoglio, just 12 kilometres (7.5 mi) from Calvisano. In 1915, G. E. K. Braunholtz drew attention to the proximity of these inscriptions to each other, and the fact that Calvisano is exactly 30 Roman miles from Mantua, which led Robert Seymour Conway to theorize that these inscriptions have to do with relatives of Virgil, and Calvisano or Carpenedolo, not Pietole, is the site of Andes. E. K. Rand defended the traditional site at Pietole, noting that Egnazio's 1507 edition of Probus's commentary, supposedly based on a "very ancient codex" from Bobbio Abbey which can no longer be found, says that Andes was three miles from Mantua, and arguing this is the correct reading. Conway replied that Egnazio's manuscript cannot be trusted to have been as ancient as Egnazio claimed it was, nor can we be sure that the reading "three" is not Egnazio's conjectural correction of his manuscript to harmonize it with the Pietole tradition, and all other evidence strongly favours the unanimous reading of the other witnesses of "thirty miles." Other studies claim that today's consideration for ancient Andes should be sought in the Casalpoglio area of Castel Goffredo.

By the fourth or fifth century AD the original spelling Vergilius had been changed to Virgilius, and the latter spelling spread to modern European languages. This latter spelling persisted even though, as early as the 15th century, the classical scholar Poliziano had shown Vergilius to be the original spelling. Today, the anglicisations Vergil and Virgil are both considered acceptable.