April 30 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 30 are broadly the same, no matter which calendar is used.
Holy Apostle James (44), the brother of St. John the Theologian.
Hieromartyr Maximus, at Ephesus, during the persecution of Decius.
Hieromartyr Aphrodisius, and 30 martyrs, at Alexandria.
Saint Donatus, Bishop of Euroea in Epirus (387)
Saint Clement the Hymnographer, abbot of the Studion (9th century)
Martyr Sophia of Fermo (c. 250)
Martyrs Marianus, James and Companions, at Lambaesis, an ancient town in Numidia in North Africa (259)
Martyrs Eutropius and Estelle, of Saintes (Gaul) (3rd century)
Saint Quintian and Saint Atticus
Hieromartyr Laurence, at Novara, and some boys whom he was teaching (397)
Saint Pomponius of Naples, Bishop of Naples in Italy (508–536) and a strong opponent of Arianism (536)
Saint Desideratus of Gourdon, hermit (c. 569)
Saint Cynwl of Wales, Hermit, brother of Saint Deiniol and first Bishop of Bangor (6th century)
Saint Erconwald, Bishop of London (693)
Saint Swithbert the Younger, Bishop of Werden in Westphalia (807)
Martyrs Amator, Peter and Louis (Ludovicus) of Cordoba, Spain, by the Emirate for blaspheming Islam (855)
Martyrs Isidore, Elias and Paul of Cordoba, Spain, by the Moors (856) (see also: April 17)