"O come, O come, Emmanuel" is a Christian hymn for Advent, which is also often published in books of Christmas carols. The text was originally written in Latin. It is a metrical paraphrase of the O Antiphons, a series of plainchant antiphons attached to the Magnificat at Vespers over the final days before Christmas. The hymn has its origins over 1,200 years ago in monastic life in the 8th or 9th century. Seven days before Christmas Eve monasteries would sing the “O antiphons” in anticipation of Christmas Eve when the eighth antiphon, “O Virgo virginum” would be sung before and after Mary's canticle, the Magnificat. The Latin metrical form of the hymn was composed as early as the 12th century.

Advent is a season observed in most Christian denominations as a time of expectant waiting and preparation for both the celebration of the Nativity of Christ at Christmas and the return of Christ at the Second Coming. Advent is the beginning of the liturgical year in Western Christianity. The name was adopted from Latin adventus "coming; arrival", translating Greek parousia from the New Testament, originally referring to the Second Coming.