April 20 (Eastern Orthodox liturgics)
April 19 - Eastern Orthodox liturgical calendar - April 21
All fixed commemorations below are observed on May 3 by Eastern Orthodox Churches on the Old Calendar.
For April 20th, Orthodox Churches on the Old Calendar commemorate the Saints listed on April 7.
Saints
Apostle Zacchaeus of the Seventy, Bishop of Caesarea in Palestine, he who was called down from the Sycamore tree by Jesus, according to the Gospel of Luke- Martyrs Acindinus, Antoninus, Victor, Zenon, Zoticus, Theonas, Caesareus, Severian and Christophoros Venerable Theodore Trichinas, hermit near Constantinople
- Saint Theotimus, Bishop of Tomis in Moesia
- Blessed Gregory and Anastasius I, Patriarchs of Antioch.
- Hieromartyr Anastasius II, Patriarch of Antioch
- Venerable Anastasius Sinaita, Abbot of the Monastery of St. Catherine at Sinai
- Venerable Ioannis the Palaiolavritis, at St. Chariton's Monastery, in the Judean Desert.
Pre-Schism Western saints
- Martyrs Sulpicius and Servilian, martyrs in Rome who were beheaded under Trajan
- Saints Marcellinus of Embrun, Vincent and Domninus, born in North Africa, they went to France and preached in the Dauphiné
- Saint Marcian of Auxerre, a monk at the Monastery of Saints Cosmas and Damian in Auxerre
- Saint Cædwalla of Wessex, King of the West Saxons
- Saint Gundebert, monk-martyr
- Saint Harduin, a monk at Fontenelle Abbey in France, then a hermit who copied writings of the Fathers
- Saint Hugh of Anzy-le-Duc, a monk at Saint Savin
Post-Schism Orthodox saints
- Venerable Saints Athanasius and Ioasaph of Meteora, Abbots.
- Venerable Alexander of Oshevensk, founder of Oshevensk Monastery, Arkhangelsk
- Child-Martyr Gabriel of Zabludov
New martyrs and confessors
- New Hiero-Confessor Theodosius, Bishop of Kolomna
Other commemorations
- "Cyprus" and "Keepiazh" Icons of the Mother of God.Translation of the relics of St. Nikolai (Velimirovich), Bishop of Ochrid and Zhicha from America to Serbia.
- Repose of Schemamonk Ignatius of St. Nicephorus Monastery in Olonets