October 21 (Eastern Orthodox liturgics)
October 20 - Eastern Orthodox liturgical calendar - October 22
All fixed commemorations below celebrated on November 3 by Eastern Orthodox Churches on the Old Calendar.
For October 21st, Orthodox Churches on the Old Calendar commemorate the Saints listed on October 8.
Saints
Hieromartyr Socrates, Priest, and Martyr Theodote, of Ancyra- Martyrs Dasius, Gaius, and Zoticus at Nicomedia
- Saint Darius, Zosimus, Paul, and Secundus, martyrs of Nicaea by Diocletian
- Martyr Azes, by fire.
- Saints Plantinos, Irene and Marina of Raithu.Venerable Hilarion the Great, of Gaza
- The 63 Martyrs of Jerusalem :
- Martyrs Andrew, Stephen, Paul and Peter, under Constantine V Copronymus
- Venerable Martyr Zacharias, by drowning in the sea.
- Venerable Baruch, reposed in peace.
- Venerable Phillip
- Venerable Jacob, Oeconomus of Batheos Rhyakos Monastery.
Pre-Schism Western saints
- Saint Asterius of Ostia, martyred priest
- Saint Viator of Lyons, hermit.
- Saint Ursula of Cologne and her companions, martyrs at Cologne
- Saint Cilinia, the mother of St Principius, Bishop of Soissons and St Remigius, Bishop of Rheims
- Saint Fintan Munnu, of Teachmunnu, Ireland
- Saint Tuda of Lindisfarne, Bishop of Lindisfarne
- Saint Condedus, a hermit at Fontaine-de-Saint-Valéry in the north of France
- Saint Wendelin of Trier, a shepherd who was famous for his holiness and is venerated at St Wendel on the Nahe in the west of Germany
- Saint Malathgen of Cluain-Edneach, Ireland, Abbot
- Saint Hugh of Ambronay, third Abbot of Ambronay Abbey near Belley in France
- Saint Maurontus, Abbot of St Victor at Marseilles, he became bishop of the same city around 767
Post-Schism Orthodox saints
- Saint Hilarion of Kiev, the first non-Greek Metropolitan of Kiev
- Venerable Hilarion the Schemamonk of the Kiev Caves
- Venerables Barnabas and Hilarion the Wonderworkers, of Peristerona, Cyprus, of the "300 Allemagne Saints" in Cyprus
- Venerable Philotheus of Neapolis and Mt. Athos
- Saints Theophilus and James, monks of Konevits, founders of Dormition Monastery at Omutch, Pskov
- Saint Hilarion, founder of Pskovoezersk Monastery, Gdov
- Saints Bessarion, Hieromonk, and Sophronius of Ciorara, monk, Confessors, and St. Oprea of Săliște, martyred by the Latins in Romania.
- New Martyr John of Monemvasia, Peloponnesus, at Larissa
- Hieroconfessors John of Galёs, and Moses, Priests, of Sibiel, Transylvania
New Martyrs and Confessors
- New Hieromartyr Alexis, Bishop of Voronezh
- New Hieromartyrs Paulinus, Archbishop of Mogilev, and Arcadius, Bishop of Ekaterinburg, and with them Anatole Levitsky and Nicander Chernelevsky, Priests, and New Martyr Cyprian Annikov
- New Hieromartyr Damian, Archbishop of Kursk
- New Hieromartyrs Constantine Chekalov, Sergius Smirnov, Basil Nikolsky, Theodore Belyaev, Vladimir Vvedensky, Nicholas Raevsky, John Kozyrev, Basil Kozyrev, Alexander Bogoyavlensky, Demetrius Troitsky, and Alexis Moskvin, Priests, and Sergius Kazansky and John Melnitsky, Deacons, all of the Tver diocese
- New Hieromartyrs Neophytus, Archimandrite, of Moscow, and Sophronius, Hieromonk, of Lozeva, Tver
- New Virgin-Martyr Pelagia Testovoy
Other commemorations
Translation of the relics of St. Christodoulos the Wonderworker of Patmos- Translation of the relics of St. Hilarion, Bishop of Meglin, Bulgaria
- Repose of Schema-Archimandrite Herman of New Valaam Monastery in Siberia
- Repose of Schema-Nun Seraphima of Shamordino Convent