April 4 in Eastern Orthodox liturgical calendars is a feast day and a day of commemoration of saints and martyrs. Although some Orthodox churches use the Revised Julian Calendar and others use the traditional Julian calendar, the fixed commemorations for their respective April 4 are broadly the same, no matter which calendar is used.
Martyrs Agathopodes, a deacon, and Theodulus, a lector, at Thessalonica, under Maximian (c. 286–305) (see also: April 5 - Slavic)
Virgin-martyr Pherbutha (Tarbula, Phermoutha, Ferfouthe) of Persia, with her sister Mekadoshta and the latter’s maidservant (343)
Venerable George of Mount Maleon (Malevon) in Laconia, monk, in the Peloponnese (5th-6th centuries)
Venerable Publius the Egyptian. (see also: April 5 - Slavic)
Venerable Zosimas of Palestine, Hieromonk (c. 560)
Venerable Saints Theonas, Symeon, and Fervinus (Phorbinus). (see also: April 5 - Slavic)
Venerable Platon the Studite (Plato of Sakkoudion), Abbot of the Studion and Confessor (812) (see also: April 5 - Slavic)
Venerable Joseph the Hymnographer, of Sicily (883) (see also: April 3)
Saint Guier, a priest and hermit in Cornwall, where a church recalls his name.
Saint Gwerir, a hermit near Liskeard in Cornwall, at whose grave King Alfred was healed of a serious illness.
Saint Tigernach of Clones (Tigernake, Tierney, Tierry), Abbot of Clones, succeeded St Macartin as bishop at Clogher in Ireland (549)
Saint Isidore of Seville, Bishop of Seville (636)
Saint Hildebert of Ghent, Abbot of Saint Peter's Abbey, Ghent, Belgium, martyred by fanatics for defending the veneration of icons (752)
Venerable Joseph the Much-ailing, of the Kiev Caves (14th century)
Venerable James, monk of Starotorzhok (Old Torzhok) in Galich, Kostroma (15th-16th centuries)
Venerable Theonas, Metropolitan of Thessaloniki (1541)
Venerable Zosimas, founder and abbot of the Annunciation Monastery at Lake Vorbozoma (Vorbosomsk) (1550)