October 27 (Eastern Orthodox liturgics)
October 26 - Eastern Orthodox liturgical calendar - October 28
All fixed commemorations below celebrated on November 9 by Eastern Orthodox Churches on the Old Calendar.
For October 27th, Orthodox Churches on the Old Calendar commemorate the Saints listed on '''October 14.'''
Saints
Saint Claudia Procula, wife of Pontius Pilate- Martyrs Capitolina and Eroteis, of Cappadocia
- Martyrs Mark of the island of Thasos and those with him Martyr Nestor of Thessaloniki
- Martyrs Mabrianos and Valentine.
- Saint Kyriakos II, Patriarch of Constantinople
Pre-Schism Western saints
- Saint Florentius, a martyr in Trois-Châteaux in Burgundy in France
- Martyrs Vincent, Sabina and Christeta, martyrs in Avila in Spain
- Saint Gaudiosus of Naples, Bishop of Abitina in North Africa
- Saint Namatius, ninth Bishop of Clermont in France
- Saint Abbán, founder of many monasteries, mostly in the south of Ireland
- Saint Oran of Iona, monk of Iona Abbey
- Saint Desiderius of Auxerre, Bishop of Auxerre in France
- Saint Colman of Senboth-Fola, a disciple of St Aidan of Ferns, he was Abbot of Senboth-Fola, near Ferns
Post-Schism Orthodox saints
- Venerable Nestor the Chronicler, of the Kiev Caves
- Venerable Nestor the Unlettered, of the Far Kiev Caves
- Venerable Demetrius of Basarabov in Bulgaria
- Saint Alexander, Bishop of Guria and Mingrelia, Georgia
- Righteous Mother Olga Arrsamquq Michael of Kwethluk (Kuiggluk), Alaska, Tanqilria, Wonderworker, Matushka of All Alaska
New Martys and Confessors
- New Hieromartyr Sergius, Abbot, of Danilov Monastery, Moscow
Other commemorations
- Narrative about the Iberians, involving a certain ascetic woman who healed the sick, including their queen, converting many to Christ
- Uncovering of the relics, in Pereyaslavl-Zalessky, of St. Andrew, Prince of Smolensk
- Repose of Hieroschemamonk Antiochus of Svir, disciple of Elder Theodore of Svir