thumb|An [[Eastern Orthodox Church|Eastern Orthodox cross]]

April 5 — Eastern Orthodox liturgical calendar — April 7

All fixed commemorations below are observed on April 19 by Orthodox Churches on the Old Calendar.

For April 6th, Orthodox Churches on the Old Calendar commemorate the Saints listed on March 24.

Saints

  • Hieromartyr Archilias, Priest, and Martyr Jeremiah, of Rome (3rd century)
  • Venerable Platonis (Platonida) of Nisibis, reposed in peace (c. 300-308)
  • Martyr Platonis (Platonides) and two martyrs buried up to their loins,
  • Hieromartyr Irenaeus, Bishop of Sirmium in Hungary (304) <small>(See also: March 26 - Church of Romania)</small>
  • 120 Martyrs of Persia under Shapur II (c. 344-347)
  • Martyrs Timothy and Diogenes, in Macedonia, by Arians (345)
  • Saint Eutychius, Patriarch of Constantinople (582)
  • Equal-to-the-Apostles Methodius of Moravia, Archbishop of Moravia and Enlightener of the Slavs (885) <small>(see also: May 11)</small>

Pre-Schism Western saints

  • Saints Florentius, Geminianus and Saturus, martyrs in Sirmium in Pannonia (4th century)
  • Saints Rufina, Moderata, Romana, Secundus and Seven Companions, martyred at Sirmium in Pannonia (4th century)
  • Saint Celestine, Pope of Rome (432)
  • Saint Brychan, a King in Wales with twenty-four saintly children (5th century) <small>(see also: April 5)</small>
  • Saint Gennard, a monk at Fontenelle Abbey in France and eventually Abbot of Flay (Saint-Germer-de-Fly Abbey) (720)
  • Saint Prudentius of Troyes (Prudentius Galindo) (861)
  • Saint Urban, Abbot of the Monastery of Peñalba near Astorga in Spain (c. 940)

Post-Schism Orthodox saints

  • Venerable Gregory (Drimys) of the Great Lavra on Mount Athos (Gregory the Byzantine) (1310), instructor of St. Gregory Palamas.
  • Venerable Gregory of Sinai (Mt. Athos) (Gregory the Sinaite) (1347)
  • Venerable Rufus the Obedient, of the Kiev Far Caves (14th century) <small>(see also: April 8)</small>
  • New Martyr Nicholas the Deacon, of Mytilene (1463)
  • New Martyr Paul the Russian, at Constantinople (1683)
  • New Martyrs Manuel, Theodore, George, Michael, and another George, of Samothrace, at Makri in Thrace (1835)
  • Saint Martyrius, monk of Glinsk Hermitage (1865)
  • New Hieromartyr John Boikov, Priest (1934)