June 18 (Eastern Orthodox liturgics)
June 17 - Eastern Orthodox Church calendar - June 19
All fixed commemorations below celebrated on July 1 by Orthodox Churches on the Old Calendar.
For June 18th, Orthodox Churches on the Old Calendar commemorate the Saints listed on June 5.
Saints
Martyrs Leontius, Hypatius and Theodoulos at Tripoli in Phoenicia- Martyr Aetherus of Nicomedia
- The Two Martyrs of Cyprus.
- Saint Marina the Virgin, of Bithynia
- Venerable Leontius the Shepherd, monk.
- Venerable Erasmus.
Pre-Schism Western saints
Saints Mark and Marcellian, twin brothers and deacons who suffered in Rome under Maximian- Saints Cyriacus and Paula of Málaga, two Christians, stoned to death in Málaga in Spain in the Diocletianic Persecution
- Martyr Elpidios, in Gaul
- Saint Amandus of Bordeaux, successor of St Delphinus as Bishop of Bordeaux in France, Confessor
- Saint Alena of Brussels, martyr
- Saint Calogerus the Anchorite, a Greek who lived for thirty-five years as a hermit near Girgenti in Sicily after preaching Christ in the isles of Lipari
- Saints Gregory, Demetrius and Calogerus, respectively a bishop, archdeacon and abbot in North Africa, driven out by Arian Vandals
- Saint Fortunatus the Philosopher, a bishop driven from the north of Italy by the Lombards
- Saint Osmanna, a nun at the convent of Jouarre in France
- Saint Guy of Baume, successor of St Berno at Baume Abbey in France, later a hermit near Fay-en-Bresse
Post-Schism Orthodox saints
- Venerable Peter of Koriša, aristocrat who gave away his possessions to become a monk at the Monastery of the Holy Archangels, later a hermit in the Šar Mountains
- Venerable Leontius, canonarch of the Kiev Caves
- '''Venerable Leontius the Myrrh-gusher, of Argos and of Dionysiou monastery on Mount Athos, clairvoyant'''
New martyrs and confessors
- New Hieromartyr Nicanor, Archimandrite, of Spas-Ruzsky, Moscow
- New Hieromartyrs Basil Smirnov, Alexander Krutitsky, Basil Krylov and Sergius Krotkov, Priests
- New Hieromartyr Ioannicius (Lipovac), Metropolitan of Montenegro and the Littoral, executed by Communist partisans at the close of World War II
Other commemorations
- Synaxis of the Church of the Commander-in-Chief Michael the Archangel, near the Church of St. Julian in the Forum, Constantinople.
- Bogolubov Icon of the Most Holy Theotokos
- Meeting of the Piukhtitsa Icon of the Most Holy Theotokos
- Uncovering of the relics of New Hiero-confessor Victor, Bishop of Glazov