December 17 - Eastern Orthodox liturgical calendar - December 19

All fixed commemorations below celebrated on December 31 by Eastern Orthodox Churches on the Old Calendar.^{[note 1]}

For December 18th, Orthodox Churches on the Old Calendar commemorate the Saints listed on December 5.

• Martyr Eubotius, at Cyzicus (320)^[1]
• Martyrs Phocas and Hermilas, by the sword.^[2][3]
• Hieromartyrs Zacchaeus, Deacon, and Alphaeus, reader, at Caesarea.^[3][4] (see also November 18)
• Hieromartyr Modestus I, Archbishop of Jerusalem (389)^{[5][6][7][note 2]} (see also December 16 - Modestus II)
• Saint Florus, Bishop of Amisus (7th century)^[8][9]
• Saint Michael the Confessor, at Constantinople (845)^[10][11]
• Saint Sophia the Wonderworker.^{[3][12][note 3]}
• Venerable Nomon.^{[13][note 4]}

• Martyrs Rufus and Zosimus, at Philippi in Macedonia (c. 107)^{[14][15][note 5]}
• Martyr Moses (Moysetes), a martyr in North Africa who probably suffered under Decius (c. 250)^{[14][15][note 6]}
• Martyrs Quintus, Simplicius and Companions, in North Africa under the Emperors Decius and Valerian (c. 255)^[14][15]
• Martyrs Victurus, Victor, Victorinus, Adjutor, Quartus and 30 other companions, in North Africa.^[14][15]
• Martyr Sebastian, at Rome, and his companions:

• Martyrs Nicostratus, Zoe, Castorius, Tranquillinus, Marcellinus, Mark, Claudius, Symphorian, Victorinus, Tiburtius, and Castulus (287)^[17][18][19]

• Saint Gatianus of Tours, first Bishop of Tours (3rd century)^{[14][note 7]}
• Saint Bodagisil, founded and was the first Abbot of a monastery on the Meuse in Belgium (588)^[14]
• Saint Samthann, foundress of the convent of Clonbroney in Co. Longford in Ireland (6th century)^[14]
• Saint Flannán, first Bishop of Killaloe in Ireland (7th century)^{[14][note 8]}
• Saint Desiderius of Fontenelle (Desideratus), son of St Waningus (700)^{[14][note 9]}
• Saint Winebald (Winibald), Abbot of Heidenheim and Bishop of Eichstatt (Germany) (761)^{[14][note 10]}

• Saint Daniel the Hesychast (Daniil Sihastrul), of Voroneț Monastery, Romania (15th century)^{[3][20][note 11]}
• Venerable Sebastian, Abbot of Poshekhonye Monastery (Vologda) (1500)^[22][23]

• Consecration of the Church of the Theotokos in Halkoprateia-Constantinople.^[27]
• Glorification (1694) of Righteous Simeon, Wonderworker of Verkhoturye (1642)^[23][28]
• Repose of Schemanun Nazaria, Eldress of Varatec Monastery (Romania) (1814)^[23]
• Second Finding of the Wonderworking Icon of Panagia Evangelistria of Tinos (1842)^[29] (see also: January 30)
• Repose of Metropolitan Benjamin (Costachi) of Moldavia (1846)^[23]
• Slaying of Hieromonk Nestor of Zharki (Ivanovo) (1993)^[23]

• St. Sebastian.
• St. Sebastian and the arrows.
• St. Flannans Cathedral, Killaloe
• Cell of St. Daniel the Hesychast (Daniil Sihastrul).