May 13 (Eastern Orthodox liturgics)
- Eastern Orthodox Church calendar - May 14
All fixed commemorations below celebrated on May 26 by Orthodox Churches on the Old Calendar.
For May 13th, Orthodox Churches on the Old Calendar commemorate the Saints listed on April 30.Saints
- Virgin-martyr Glyceria at Heraclea, Propontis
- Martyr Laodicius, jailer of Saint Glyceria
- Saint Theoctistus, monk from Tekoa, Palestine
- Saint Pausicacus, Bishop of Synnada
- Saint Nicephoros, Presbyter of the monastery of Ephapsios
- Saint Sergius the Confessor of Constantinople, with his wife Irene and children
- Saint Euthymius the New , founder of Iveron Monastery, and his fellow Georgian saints of Mount Athos:
Pre-Schism Western saints
- Saint Abban of Ireland, baptized in 165 AD, missionary in Abingdon, Oxfordshire
- Martyr Alexander of Rome
- Saint Valerian of Auxerre, third Bishop of Auxerre in France, and defender of Orthodoxy against Arianism.
- Saint Onesimus of Gaul, fifth Bishop of Soissons in France
- Saint Servatius, Bishop of Tongres, defender against Arianism in the Netherlands
- Saint Agnes of Poitiers, chosen by St. Radegund to be Abbess of Holy Cross at Poitiers in France
- Saint Mael, Ascetic on the Isle of Bardsey
- Saint Natalis, Bishop of Milan in Italy
- Saint Anno, Bishop of Verona in Italy
- Saint Merwenna of Rumsey, first Abbess of Rumsey convent, in Hampshire
- Blessed Fortis Gabrielli, Ascetic
Post-Schism Orthodox saints
- Venerable monk-martyrs of Iveron Monastery, martyred by the Latins
- Repose of Saint Macarius, Abbot of Glushitsa Monastery, Vologda
- Righteous Virgin Glyceria of Novgorod
- Hieromartyrs Basil Sokolov, Alexander Zaozersky, and Christopher Nadezhdin
- Hieromartyr Macarius Telegin, and Martyr Sergius Tikhomirov
- 103 New Hieromartyrs of Cherkasy
Other commemorations
- Consecration of the Monastery of , on the small island of Hagia Glykeria in the Bay of Tuzla
- Translation of the relics of Hieromartyr Saint Macarius, Archimandrite of Ovruch and Pinsk, from Kaniv to Pereyaslavl
- Repose of righteous Priest Alexis of Bortsurmany, disciple of St. Seraphim of Sarov
- Repose of Rassophore Monk John, of St. Nilus of Sora Monastery
- Repose of Eldress Sepfora of Klykovo
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