February 23 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 February 23 are broadly the same, no matter which calendar is used.
Hieromartyr Polycarp of Smyrna, Bishop of Smyrna (167)
Holy 73 Martyrs of Sirmium, under Diocletian (303)
Venerable Gorgonia the Righteous (370), sister of St. Gregory the Theologian.
Saint Alexander, founder of the Monastery of the Unsleeping Ones, Constantinople (430) (see also: January 15, July 3)
Saints John, Antioch, Antoninus, Moses, Zebinas, Polychronius, Moses (another), and Damian, ascetics near Cyrrhus in the Syrian desert (5th century)
Saint Martha, a virgin-martyr beheaded in Astorga in Spain under Decius (251)
Saint Polycarp, a priest in Rome noted for ministering to those in prison for their faith (c. 300)
Saint Serenus the Gardener, martyr (307)
Saint Romana (Romina), a virgin born in Rome who reposed at the age of eighteen while living as an anchoress in a cave on the banks of the Tiber in Italy (324).
Saints Syncrotas, Antigonus, Rutilus, Libius, Senerotas and Rogatianus, martyrs at Sirmium in Pannonia (4th century)
Saint Florentius of Seville, Confessor, a saint much venerated in Seville in Spain (c. 485)
Saint Felix of Brescia, twentieth Bishop of Brescia (c. 650)
Saint Jurmin, an East Anglian prince, son or nephew of King Anna of East Anglia (653)
Saint Boswell (Boisil), Abbot of Melrose Abbey in Scotland (c. 661) (see also: February 24)
Saint Mildburga (Milburgh), Abbess of Wenlock Priory (715)
Saint Medrald (Mérald, Méraut), a monk at Saint-Evroult (Ebrulfus) of Ouche in France, who later became Abbot of Vendôme (c. 850)
Saint Willigis, Archbishop of Mainz (1011)