Saint Valentine (Italian: San Valentino; Latin: Valentinus) was a 3rd-century Roman saint, commemorated in Western Christianity on February 14 and in Eastern Orthodoxy on July 6. From the High Middle Ages, his Saints' Day has been associated with a tradition of courtly love. He is also a patron saint of Terni, epilepsy and beekeepers. Saint Valentine was a clergyman – either a priest or a bishop – in the Roman Empire who ministered to persecuted Christians. He was martyred and his body buried on the Via Flaminia on February 14, which has been observed as the Feast of Saint Valentine (Saint Valentine's Day) since at least the eighth century.

Relics of him were kept in the Church and Catacombs of San Valentino in Rome, which "remained an important pilgrim site throughout the Middle Ages until the relics of St. Valentine were transferred to the church of Santa Prassede during the pontificate of Nicholas IV". His skull, crowned with flowers, is exhibited in the Basilica of Santa Maria in Cosmedin, Rome. Other relics of him are in Whitefriar Street Carmelite Church, Dublin, Ireland, a popular place of pilgrimage, especially on Saint Valentine's Day, for those seeking love. At least two different Saint Valentines are mentioned in the early martyrologies. For Saint Valentine of Rome, along with Saint Valentine of Terni, "abstracts of the acts of the two saints were in nearly every church and monastery of Europe", according to Professor Jack B. Oruch of the University of Kansas.

Saint Valentine is commemorated in the Anglican Communion and the Lutheran Churches on February 14. In the Eastern Orthodox Church, he is recognised on July 6; in addition, the Eastern Orthodox Church observes the feast of Hieromartyr Valentine, Bishop of Interamna, on July 30. In 1969, the Catholic Church removed his name from the General Roman Calendar, leaving his liturgical celebration to local calendars, though use of the pre-1970 liturgical calendar is also authorised under the conditions indicated in the motu proprio Summorum Pontificum of 2007. The Catholic Church continues to recognise him as a saint, listing him as such in the February 14 entry in the Roman Martyrology, and authorising liturgical veneration of him on February 14 in any place where that day is not devoted to some other obligatory celebration, in accordance with the rule that on such a day the Mass may be that of any saint listed in the Martyrology for that day.