April 25 (Eastern Orthodox liturgics)
April 24 - Eastern Orthodox liturgical calendar - April 26
All fixed commemorations below are observed on May 8 by Eastern Orthodox Churches on the Old Calendar.
For April 25th, Orthodox Churches on the Old Calendar commemorate the Saints listed on April 12.
Saints
Holy Apostle and Evangelist Mark, first Bishop of Alexandria- Saint Anianas, second Bishop of Alexandria
- Martyr Nike, by the sword
- Hieromartyr Stephen II, Patriarch of Antioch Saint Macedonius II, Patriarch of Constantinople
- The Venebrable Eight Anchorites who were martyred by the sword.
Pre-Schism Western saints
- Martyrs Evodius, Hermogenes and Callista, in Syracuse in Sicily.
- Saint Phaebadius, a Bishop of Agen in the south of France, who succeeded in stamping out Arianism in Gaul, together with his friend St Hilary of Poitiers
- Saint Maughold, a disciple of Mel who became Bishop of Croghan in Offaly in Ireland, the patron saint of the Isle of Man
- Saint Rusticus, Archbishop of Lyon
- Saint Erminus, a monk at Lobbes Abbey in Belgium and later Abbot, Bishop and Confessor
- Saint Mella, the mother of two saints, Cannech and Tigernach, who became a nun and Abbess of Doire-Melle, in County Leitrim
- Saint Heribaldus, Monk and abbot of the monastery of St Germanus in Auxerre in France and later bishop of the same city
- Saint Robert of Syracuse, Abbot of a monastery in Syracuse in Sicily
Post-Schism Orthodox saints
- Saint Sylvester of Obnorsk, Abbot of Obnora Monastery
- Venerable Basil, Elder of Poiana Mărului, Romania
- Venerable Bassian the Blind, Hiero-schema-monk of the Kiev Caves
New martyrs and confessors
- Hieromartyr Sergius Rokhletsov, Protopresbyter, of Veliky Ustyug
Other commemorations
- Commemoration of the Consecration of the Church of the all-praised Apostle Peter, located near the Cathedral of Hagia Sophia in Constantinople.
- Icon of the Mother of God of Constantinople
- Repose of Elder Philotheus (Zervakos) of Paros