January 1 - Eastern Orthodox liturgical calendar - January 3

All fixed commemorations below are observed on January 15 by Eastern Orthodox Churches on the Old Calendar.^{[note 1]}

For January 2nd, Orthodox Churches on the Old Calendar commemorate the saints listed on December 20.

• Forefeast of the Theophany of Our Lord and Savior Jesus Christ.^{[1][note 2]}

• Saint Theodota, mother of the holy Unmercenaries Saints Cosmas and Damian (3rd century)^[1][3]
• Martyr Sergius, by the sword, at Caesarea in Cappadocia (301)^[1][4]
• Martyr Theopistus (Theopistos), by stoning.^[5]
• Hieromartyr Theogenes, Bishop of Parium on the Hellespont (c. 320)^[1][6][7]
• Saint Sylvester, Pope of Rome (335)^[1][8][9] (see also December 31 - Latin Calendar)
• Martyr Basil of Ancyra, under Julian the Apostate (362)^[10] (see also January 1 - Slavonic)
• Hieromartyr Isidore, Bishop of Syrian Antioch, by the Arians (4th century)^[11][12]
• Saint Theopemtus, Monk.^[13]
• Saint Mark the deaf-mute.^[14]
• Saint Amun of Tabennisi, monk (4th century)^[1][15] (see also October 4 - Greek)

• Martyrs Artaxus, Acutus, Eugenda, Maximianus, Timothy, Tobias and Vitus, in Syrmium in Pannonia (3rd–4th century)^[16]
• Martyrs of Rome, many martyrs who suffered in Rome under Diocletian for refusing to give up the Holy Scriptures (c. 303)^{[16][note 3]}
• Thousand Martyrs of Lichfield ('field of bodies') in England:

• Hieromartyr Amphibalos and 999 others at Lichfield, under Diocletian (c. 303)^{[15][note 4][note 5]}

• Saint Martinianus of Milan (Maternian), Bishop of Milan in Italy, took part in the Third Oecumenical Council at Ephesus and wrote against Nestorianism (c. 435)^[12][16]
• Saint Aspasius of Auch, Bishop of Auch in France, took part in the Second, Fourth, and Fifth Councils of Orleans in 533, 541 and 549, besides holding a council in Auch in 551 (c. 560)^[16]
• Saint Schottin (Schotin, Scarthin), hermit of Kilkenny, Ireland (6th century)^{[1][note 6]} (see also January 6)
• Saint Seiriol the Righteous, Abbott of Penmon Priory, brother of King Cynlas of Rhos and King Einion of Llŷn (6th century)^[19] (see also February 1 - Latin Calendar)
• Saint Munchin the Wise (Mainchín of Limerick), probably the first Bishop of Limerick and also its patron-saint (late 6th century)^[16]
• Saint Blidulf (Bladulf), a monk at Bobbio Abbey in Italy who bravely denounced the heresy of the Lombard King Ariovald, an Arian (c. 630)^[16]
• Saint Vincentian (Viance, Viants), a disciple of St Menelaus, he became a hermit near Tulle in Auvergne in France (c. 730)^[16]
• Saint Adalard of Corbie (827)^{[16][note 7]}

• Saint Cosmas I of Constantinople the Wonderworker, Patriarch of Constantinople (1081)^[1][15][20]
• Saint Sylvester of the Kiev Caves (12th century)^{[1][15][21][note 8]}
• Righteous Juliana of Lazarevo (1604)^{[1][15][23][24]}
• New Martyr George (Zorzes, Zorsisus) the Georgian, at Mytilene (1770)^{[1][15][25][26]}
• Repose (1833) and Second Finding (1991) of the Relics of St. Seraphim of Sarov, Wonderworker of Sarov^{[1][15][27][28][note 9]}

• Repose of Hieroschemamonk Gabriel of Optina and Whitehoof Convent (1871)^[1]
• Repose of Abbess Thaisia of Leushino Monastery (1915)^{[1][note 10]}
• Martyred Elder Ioasaph of St. Tikhon of Kaluga Monastery (1919)^[1]
• Repose of Elder Iakovos of Epirus (1961)^[1]

• Saint Sylvester, Pope of Rome, and the Emperor Constantine the Great.
• Adoration of the Cross by Pope St. Sylvester I, Empress Helena and Emperor Constantine.
• Martyr Basil of Ancyra
  (Menologion of Basil II, 10th century).
• Relics of Saint Martinianus of Milan, in the Cathedral of Milan.
• Mosaic of Saint Seiriol the Righteous, Abbott of Penmon Priory.
• Righteous Juliana of Lazarevo.
• Saint Seraphim of Sarov, Wonderworker.