Sep. 10 - Eastern Orthodox liturgical calendar - Sep. 12

All fixed commemorations below celebrated on September 24 by Orthodox Churches on the Old Calendar.^{[note 1]}

For September 11th, Orthodox Churches on the Old Calendar commemorate the Saints listed on August 29.

• Martyrs Demetrius, his wife Evanthia, and their son Demetrian, at Skepsis on the Hellespont (1st century)^{[1][2][3][4][note 2]}
• Martyrs Serapion, Cronides (Hieronides), and Leontius, of Alexandria (237)^[1][5] (see also: September 13)
• Martyr Ia of Persia^[3][6] and 9,000 martyrs of Persia under Shapur II with her (362-364)^[1][5][7] (see also: September 10, August 4, August 11)
• Martyrs Diodorus, Didymus, and Diomedes of Laodicea (362-364)^[1][3][8][9]
• Saint Paphnutius the Confessor, Bishop in the Egyptian Thebaid (4th century)^{[1][5][note 3]} (see also: March 27)
• Venerable Theodora of Alexandria (491)^{[1][3][5][11][12][note 4]}
• Saint Euphrosynus the Cook of Alexandria (9th century)^{[1][3][13][14][note 5]}
• Venerable Elias the Cave-dweller of Calabria (Elia Speleota), and his spiritual father St. Arsenios (c. 960)^{[1][5][15][note 6][note 7]}
• Holy Martyr Theodora of Vasta, in the central Peloponnese (10th century)^{[1][5][16][17][note 8]}

• Saint Protus and Hyacinth, by tradition brothers, they were both servants and were martyred in Rome (c. 257)^{[18][note 9][note 10]}
• Saints Felix and Regula, brother and sister, martyred near Zurich (3rd century)^[18]
• Saint Patiens of Lyon, Archbishop of Lyons in France (c. 491)^{[10][18][note 11]}
• Saint Emilian, a hermit for forty years, he became Bishop of Vercelli in Piedmont in Italy, where he reposed a centenarian (520)^[10][18]
• Saint Vincent of León, Abbot of St Claudius in León in Spain, he was martyred by the Arian Visigoths (c. 554)^{[10][18][note 12]}
• Saint Almirus (Almer, Almire), born in Auvergne in France, he finally went to live as a hermit at Gréez-sur-Roc, where he reposed (c. 560)^[18]
• Saint Deiniol, Abbot and first Bishop of Bangor, Wales (584)^{[1][5][18][note 13]}
• Saint Adelphus, grandson of St Romaricus and his successor as Abbot of Remiremont Abbey in the east of France (c. 670)^[18]
• Saint Bodo (Leudinus), Bishop of Toul (c. 670)^{[18][note 14]}

• Venerable Silouan the Athonite, Elder, of St. Panteleimon Monastery, Mt. Athos (1938)^[1][5][20] (see also: September 24)
• Saint John, Abbot, of Svyatogorsk Monastery (1970)^[1]

• Translation of relics of Sergius and Herman, Wonder-workers of Valaam Monastery (1542-1550)^{[1][5][20][22][23]}
• Weeping Kazan Icon of the Most Holy Theotokos "of Kaplunovka" (1689)^{[1][5][20][24]}
• Glorification of St. Xenia of Saint Petersburg, Fool-for-Christ (1978)^[1][5]
• Synaxis of the Saints of the Svatogorsk Monastery.^[1]
• Repose of the young Elder Melchizedek of Mzensk (1846)^[1]

• Martyr Ia of Persia.
• Martyrs Diodorus and Didymus of Laodicea.
• Venerable Theodora of Alexandria.
• The church of St. Theodora of Vasta, with holly and maple trees growing on its roof.
• Sts. Protus and Hyacinth.
• Sts. Felix and Regula.
• Venerable Silouan the Athonite.