March 13 - Eastern Orthodox liturgical calendar - March 15

All fixed commemorations below are observed on March 27 by Orthodox Churches on the Old Calendar.^{[note 1]}

For March 14th, Orthodox Churches on the Old Calendar commemorate the Saints listed on March 1.

• Martyrs Basil and Euphrasius, together with other Christians, in Thessaloniki.^[1]
• Martyr Florentius, in Thessaloniki, by fire.^[2] (see also: October 13)
• Martyr Alexander, in Thessaloniki (c. 285-305).^{[3][note 2]}
• Martyr Eustathius and his company, at Carrhae, Mesopotamia (741)^{[4][5][note 3]}
• Venerable Euschemon the Confessor, Bishop of Lampsacus (9th century)^{[4][7][8][note 4]}

• Holy 47 Martyrs of Rome, baptised by the Apostle Peter, and suffered in Rome under Nero, all on the same day (c. 67)^[6][9][10]
• Hieromartyr Leo, Bishop and Martyr, perhaps under the Arians, in the Agro Verano in Italy.^[6][9]
• Martyrs Peter and Aphrodisius, who obtained the crown of martyrdom in the persecution of the Vandals (5th century)^{[6][9][11][12]}
• Monk-Martyrs of Valeria, in the province of Valeria, Italy, slain by the Lombards (5th century)^{[9][note 5]}
• Venerable Benedict of Nursia, Abbot (543)^{[4][9][13][14]} (see also: July 11 - Translation)
• Saint Diaconus, a deacon in the Marsi in central Italy, martyred together with two monks by the Lombards (6th century)^[9]
• Saint Boniface Curetán, a Scoto-Pictish Bishop of Ross (c. 630 or 660)^{[9][15][note 6]}
• Saint Talmach, a disciple of St Barr at Lough Erc in Ireland, and founder of a monastery (7th century)^[9][16]
• Saint Matilda (Mathildis, Maud), wife of German king Henry the Fowler, who founded, among others, the monasteries of Nordhausen, Pöhlde, Engern and Quedlinburg in Germany (968)^[9][17]

• Saint Rostislav-Michael, Great Prince of Kiev (1167)^[4][18][19]
• Saint Theognostus of Kiev, the Greek Metropolitan of Kiev and all Rus' (1353)^{[4][20][21][note 7]}
• Venerable Andreas (Andrew), Abbot, of the Holy Trinity Monastery in Rafailovo, Siberia (1820)^{[22][note 8]}

• Icon of the Most Holy Theotokos of St. Theodore ("Feodorovskaya"), Kostroma (1239, 1613)^{[4][23][24][25][note 9]} (see also: August 16)
• Repose of Blessed John, Fool-for-Christ of Yurievets (1893)^[4][27]

• St. Benedict of Nursia.
• Saint Matilda.
• Metropolitans of Kiev and all Rus': Photius, Theognostus (center), and Cyprian.
• Theotokos of St. Theodore, original icon from Epiphany Monastery in Kostroma.