June 12 (Eastern Orthodox liturgics)
- Eastern Orthodox Church calendar - June 13
All fixed commemorations below celebrated on June 25 by Orthodox Churches on the Old Calendar.
For June 12th, Orthodox Churches on the Old Calendar commemorate the Saints listed on May 29.Saints
- Virgin-martyr Antonina, of Nicaea in Bithynia
- Saints Basilides, Cyrinus, Nabor and Nazarius, and those with them, soldiers, at Rome
- Saint Amphianus, Bishop and Confessor, in Cilicia
- Saint Triphyllius, Bishop of Leucosia, in Cyprus
- Saint Zenon, Bishop of Kyrenia in Cyprus.
- Saint Olympius, Bishop and Confessor, in Thrace
- Saint Timothy the Hermit, of Egypt
- Saints John, Andrew, Heraclemon, and Theophilus, hermits of Egypt
- Venerable Onuphrius the Great
- Saint John the Soldier, of Egypt
- Venerable Peter of Mount Athos
- Venerable Julian of Dagaz '', of the Dagouta Church in Constantinople.
- Saint John of Mt. Athos and Georgia
Pre-Schism Western saints
- Virgin-martyr Cunera of Rhenen, Netherlands
- Saint Ternan, an early missionary bishop among the Picts in Scotland
- Saint Leo III, Pope of Rome, who refused to add the filioque to the Nicene Creed
- Saint Odulphus, Confessor and Priest
- Saint Gerebald, Bishop of Châlons-sur-Seine in France
Post-Schism Orthodox saints
- New Martyr John of Trebizond, who contested in Akkerman
- Venerable Arsenius of Konevits, founder of Konevits Monastery, Wonderworker
- Venerable Onuphrius of Malsk, founder of Malsk Monastery in Pskov, Wonderworker
- Saints Onuphrius and Auxentius, monks, of Vologda
- Venerable Stephen of Komel, founder of Ozersk Monastery in Vologda
- Saints Jonah and Bassian, monks of Pertomsk in Solovki
- Saint Onuphrius of Katrom Monastery, founder of Katrom Monastery in Vologda
- Venerable Serapion the Wonderworker, of Izborsk, Igumen
- Saint Onuphrius the Fool-for-Christ, of Romanov-Borisoglebsk.
- Venerable Onuphrios of Preveza, of the Monastery of the Birth of the Theotokos, in Coronisia in Arta, Greece
- Hieromartyr Benedict of Serres and Thessaloniki, priest, by beheading, and other monk-martyrs with him :
- New Martyrs Onuphrius, Bishop, and those with him:
Other commemorations
- Synaxis of Venerable Alypius the Stylite of Adrianopolis, in Constantinople.
- First and second glorifications of St. Anna of Kashin, princess of Kashin.
- Uncovering of the relics of St. John of Moscow, Fool-for-Christ
- Synaxis of the Saints of the St. Onuphrius Monastery at Jabłeczna in Poland.
- Miracle-working icons of the Theotokos and St. Onuphrius, at St. Onuphrius Monastery in Poland
- Repose of Elder Peter of Katounakia, Mt. Athos
- Repose of Blessed Hermit Philaretus of Mt. Athos
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