Lucia of Syracuse (283–304), also called Saint Lucia was a Roman Christian martyr who died during the Diocletianic Persecution. She is venerated as a saint in Catholic, Anglican, Lutheran, and Eastern Orthodox Christianity. She is one of eight women explicitly commemorated by Catholics in the Canon of the Mass. Her traditional feast day, known in Europe as Saint Lucy's Day, is observed by Western Christians on 13 December. Lucia of Syracuse was honored in the Middle Ages and remained a well-known saint in early modern England. She is one of the best known virgin martyrs, along with Agatha of Sicily, Agnes of Rome, Cecilia of Rome, and Catherine of Alexandria.

Saint Lucy's Day, also called the Feast of Saint Lucy, is a Christian feast day observed on 13 December. The observance commemorates Lucia of Syracuse, an early-fourth-century virgin martyr under the Diocletianic Persecution. According to legend, she brought food and aid to Christians hiding in the Roman catacombs, wearing a candle-lit wreath on her head to light her way, leaving both hands free to carry as much food as possible. Because her name means "light" and her feast day had at one time coincided with the shortest day of the year prior to calendar reforms, it is now widely celebrated as a festival of light. Falling within the Advent season, Saint Lucy's Day is viewed as a precursor of Christmastide, pointing to the arrival of the Light of Christ in the calendar on 25 December, Christmas Day.