Glycerius () was a deacon who was martyred in Antioch. He is honoured as a Saint in the Catholic Church. Previously, he was listed as 'Clerus' on 7 January in the Old Roman Martyrology.
Almost nothing is known about the life and martyrdom of Glycerius. He was a deacon and martyr of Antioch. He was tortured seven times, imprisoned, and finally martyred by beheading in Antioch, Syria.