December 31 (Eastern Orthodox liturgics)
- Eastern Orthodox liturgical calendar - January 1
All fixed commemorations below are observed on January 13 by Eastern Orthodox Churches on the Old Calendar.
For December 31st, Orthodox Churches on the Old Calendar commemorate the Saints listed on December 18.Feasts
- Apodosis of the Nativity of Christ.
Saints
- Holy Ten Virgin-martyrs of Nicomedia
- Martyr Olympiodora, by fire.
- Martyr Busiris, martyred by women with knitting needles.
- Martyr Nemi, by the sword.
- Saint Gaudentius.
- Hieromartyr Zoticus the Priest, of Constantinople, Guardian of Orphans
- Saint, Bishop of Thessaloniki
- Venerable Melania the Younger, Nun of Rome
- Venerable Gelasius, Monk, of Palestine.
- Venerable Gaius.
- Saint George the Wonderworker, "the stabbed".
- Venerable Sabiana, Abbess of Samtskhe
Pre-Schism Western saints
- Saint Columba of Sens
- Martyrs of Catania:
- * Stephen, Pontian, Attalus, Fabian, Cornelius, Sextus, Flos, Quintian, Minervinus and Simplician, early martyrs in Catania in Sicily.
- Martyrs Donata, Paulina, Rustica, Nominanda, Serotina, Hilaria and Companions.
- Hieromartyrs Sabinian and Potentian
- Saint Silvester I, Pope of Rome
- Saint Barbatian, Priest and Confessor, at Ravenna
- Saint Peter of Subiaco
Post-Schism Orthodox saints
- Blessed Theophylactus of Ohrid, Archbishop of Ochrid
- Saint Peter, Metropolitan of Kiev, Defender of the Orthodox faithful against subjugation to the Roman Papacy
- Venerable Cyriacus of Bisericani monastery, Romania
- Venerable Cyriacus of Tazlu, Romania
- New Hieromartyr Michael Berezin, Priest
- Martyr Peter Troitsky
- New Hiero-Confessor, Metropolitan of Zagreb
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