May 9 - Eastern Orthodox Church calendar - May 11

All fixed commemorations below celebrated on May 23 by Orthodox Churches on the Old Calendar.^{[note 1]}

For May 10, Orthodox Churches on the Old Calendar commemorate the Saints listed on April 27.

• Saint Simon the Zealot, Apostle (1st century)^[1]
• Martyr Hesychius the Palatine of Antioch (c. 304)^[2]
• Saint Isidora the Fool-for-Christ, of Tabennisi, Egypt (c. 365)^[3]
• Saint Isidore of Alexandria (Isidore The Simple-Minded) (319-404), Hieromonk and Hospitaller (hospital administrator) (404)^{[4][note 2]}
• Venerable Passarion the Presbyter (Passarion of Palestine), Agapius and Philemon (mid-5th century)^{[7][note 3]}
• Blessed Thais (Taisia) of Egypt (5th century)^[3]
• Saint Laurence of Egypt, monk (6th century)^[3]

• Martyrs Calepodius, Palmatius, Simplicius, Felix, Blanda and Companions (c. 222–232)^[11][12]
• Martyrs Alphius, Philadelphus, Cyprian, at Lentini in Sicily (251)^[11][12][13]
• Martyrs Erasmus, Onesimus, and 14 other martyrs, in Sicily (251)^[14]
• Saint Aurelian of Limoges, Disciple of St Martial of Limoges in France (3rd century)^[12]
• Martyrs Quartus and Quintus, two citizens of Capua who were condemned and executed in Rome.^[11][12]
• Saint Conleth, first Bishop of Kildare (c. 519)^[15] (see also: May 3 and May 4)^[16][17][18]
• Saint Comgall, founder and abbot of Bangor (602)^[12][19]
• Saint Cataldus, born in Munster in Ireland, became a monk at Lismore, then Bishop of Taranto; renowned for miracles (7th century)^[11][12]
• Virgin-martyr Solangia (Solange) (880)^[12]

• Saint Simon of Vladimir and Suzdal (Kiev Caves), Bishop (1226)^[20]
• Venerable Laurence, monastic founder at Mt. Pelion in Volos (late 14th century)^[21]
• Blessed Simon of Yurievets and Zharki, Fool-for-Christ (1584)^[3]
• Saint Eustathios of Crimea (1745-1759), martyred in Theodosia, Crimea (1759)^[22]
• Saint Synesius of Irkutsk (1787)^{[3][note 4]}
• Saint Yoakim Krchovski (1820)^[24][25]

• The passage of the relics (1087) of St. Nicholas the Wonderworker through the island of Zakynthos, while on their way to Bari.^[26]
• Translation of the relics (1670) of the blessed martyr Basil of Mangazea in Siberia (1602)^[3][27]
• "Kiev-Bratskaya" Icon of the Mother of God (1654)^{[28][note 5]}
• Repose of Eldress Taisia (Thaisia) of Voronezh (1840)^[3]
• Repose of Hieromonk Andrew (Abramius in Schema) of Whitehoof Convent (1902)^[3]
• Slaying of Soldier Eugene Rodionov in Chechnya (May 23, 1996)^[30]

• Icon of St. Simon the Zealot.
• Chapel of St. Aurelian, Limoges.
• St. Comgall's parish church, Bangor.
• St. Cataldus.
• Church of St. Solange, Sainte-Solange, Cher, France.