August 23 - Eastern Orthodox liturgical calendar - August 25

All fixed commemorations below are observed on September 6 by Eastern Orthodox Churches on the Old Calendar.^{[note 1]}

For August 24, Orthodox Churches on the Old Calendar commemorate the Saints listed on August 11

• Hieromartyr Eutychius (1st century), disciple of St. John the Theologian.^{[1][2][3][4][note 2]}
• Martyr Tation, at Claudiopolis (Bithynia) (305)^{[1][3][6][7][note 3]}
• Virginmartyr Kyra (Cira, Cira, Shirin) Persia (558)^[1][8]
• Saint George Limniotes the Confessor, of Mount Olympus in Bithynia (716)^{[1][3][9][note 4][note 5]}

• Saint Ptolemy (Ptolemaeus), by tradition a disciple of the Apostle Peter, he became Bishop of Nepi in Tuscany in Italy, where he was martyred (1st century)^{[11][note 6]}
• Saint Romanus of Nepi, a Bishop and martyr of Nepi in Tuscany, Italy, by tradition a disciple of St Ptolemy (1st century)^{[11][note 7]}
• Saint Aurea of Ostia, an early martyr in Ostia in Italy (c. 270)^{[11][note 8]}
• Saint Patrick, a bishop in Ireland, surnamed Patrick the Elder, whose relics were later enshrined at Glastonbury in England (c. 450)^{[11][note 9][note 10]}
• Saint Yrchard (Irchard, Yarcard), a priest in Scotland, consecrated bishop by St Ternan to work among the Picts (5th century)^[11]
• Saint Ouen (Audöenus, Audoin, Aldwin, Owen, Dado), Archbishop of Rouen, Gaul, Confessor (c. 683)^{[1][5][11][note 11]}
• Saint Bregwin, Twelfth Archbishop of Canterbury (764)^{[11][note 12]}
• Saint Sandratus (Sandradus), Abbot of Gladbach, and in 981 Abbot of Weissenburg (986)^{[11][note 13]}

• Saint Martyrius, Archbishop of Novgorod (1199)^[1][12][13]
• Hieromartyr Athanasius II, Patriarch of Jerusalem (1244)^[1]
• Venerable Arsenius, founder of Komel Monastery (Vologda), Wonderworker (1550)^{[1][12][14][15]}
• Venerable Serapion the Wonderworker, abbot of the Monastery of St. John the Baptist at David Gareja monastery complex, Georgia (1774)^[1][12][16]
• New Hieromartyr Cosmas of Aetolia, Equal-to-the-Apostles (1779)^{[1][3][12][17][18]} (see also: August 4)
• Saint Aristocleus, Elder, of Moscow and Mount Athos (1918)^{[1][12][note 14]}

• Icon of the Most Holy Theotokos "Petrovskaya" ("of St. Peter of Moscow") (ca. 1306)^[1][12][20]
• Appearance of the Most Holy Theotokos (c. 1385) to St. Sergius of Radonezh (1392)^[1][12][21]
• Translation of the relics (1479) of St. Peter of Moscow, Metropolitan of Kiev and Moscow (1326)^[1][12][22]
• Translation of the relics (1716) of St. Dionysios of Zakynthos, Archbishop of Aegina (1624)^{[1][3][12][23]}

• Interior of the Basilica of St. Aurea of Ostia.
• New Hieromartyr Cosmas of Aetolia, Equal-to-the-Apostles.
• New Hieromartyr Maxim Sandovich, Priest, of Lemkovina.
• Sarcophagus of Saint Dionysios of Zakynthos.