August 4 - Eastern Orthodox liturgical calendar - August 6

All fixed commemorations below are observed on August 18 by Eastern Orthodox Churches on the Old Calendar.^{[note 1]}

For August 5, Orthodox Churches on the Old Calendar commemorate the Saints listed on July 23.

• Forefeast of the Transfiguration of Jesus.^[1][2][3]

• Hieromartyrs Antherus (236)^{[4][note 2]} and Fabian (Fabianus) (250),^{[6][7][note 3]} Popes of Rome.^[1]
• Martyr Pontius, at Cimella in Gaul (257)^[1][8][9]
• Martyr Eusignius of Antioch (362)^{[1][10][11][note 4]}
• Righteous Nonna (374), wife of Gregory of Nazianzus the Elder and mother of St. Gregory the Theologian.^[1][13][14]
• Martyrs Cantidius and Cantidianus, brothers, of Egypt, by stoning (4th century)^{[1][15][note 5]}
  • Martyr Sibelius (Sobel) of Egypt, shot by bow and arrow (4th century)^[1][16][17]
• Saint Therissos (Thyrsos), Bishop of Karpasia, Cyprus.^{[18][19][note 6]}
• Saint Euthymius I, Patriarch of Constantinople (917)^[1][20]

• Saint Memmius (Menge, Meinge), Founder and first Bishop of Châlons-sur-Marne in France, and Apostle of the region (c. 300)^{[5][note 7]}
• Twenty-three (23) Martyrs of Rome, on the Salarian Way in Rome, under Diocletian (303)^{[5][note 8]}
• Saint Emygdius (Emidius), a saint whose relics were venerated in Ascoli in Italy (c. 303)^{[5][note 9]}
• Martyr Afra, in Augsburg in Germany, under Diocletian (c. 304)^{[5][note 10]}
• Saint Paris, Bishop of Teano near Naples in Italy (346)^[5][12]
• Saint Cassian of Autun, Bishop of Autun in France, 314-350, he succeeded St Reticius and was famous for his miracles (c. 350)^[5][12]
• Saint Venantius, the most famous of the ancient Bishops of Viviers in France (544)^[5]
• Martyr Oswald of Northumbria, King of Northumbria (642)^{[1][12][21][22][23][note 11]}
• Saint Abel of Reims, Archbishop of Rheims in France (c. 751)^[5][24]
• Saint Theodoric, Bishop of Cambrai-Arras in the north of France c 830-863 (863)^[5]
• Saint Gormcal, Abbot of Ardoileán in Galway in Ireland (1016)^[5][25]

• Saint Theoctistus, Bishop of Chernigov (1123)^{[9][26][note 12]}
• Venerable Monk-martyr Job the Gorge-dweller (Job of Ushchelsk), on the Mezen River (Solovki) (1628)^[1][9][27]
• New Martyr Christos of Preveza, at Kos (1668)^[1][28]
• Venerable Eugenius of Aetolia (1682)^{[1][19][29][note 13]}
• Saint John Jacob the Chozebite, of Neamț (1960)^{[9][30][31][note 14][note 15]} (see also: July 28 - Greek)

• Uncovering of the relics (1967) of St. Arsenius the New of Paros (1877)^[1][31]

• Hieromartyr Pope Anterus.
• Hieromartyr Fabian (Fabianus).
• Consecration of Euthymius as Patriarch of Constantinople.
• Saint Afra.
• Martyr-King Oswald of Northumbria, King of Northumbria.
• Saint Abel of Reims.
• Relics of St. John Jacob the Chozebite, of Neamț, (St. George's Monastery, West Bank).
• New Hieromartyr Simon (Shleyev), Bishop of Ufa.