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- Saint Yaropolk-Peter, Prince of Vladimir in Volhynia (11th century) 21 November
- Blessed Yaropolk-Peter, Prince of Vladimir in Volhynia (1086) 22 November
- New Hieromartyr Yaroslav Savitsky, Protopresbyter of Moscow (1937) 25 November
- Saint Yaroslav the Wise, Grand Prince of Kiev, son of the Varangian (Viking) Grand Prince Vladimir the Great (1054) 20 February
- Saint Yaroslav the Wise, son of the Varangian (Viking) Grand Prince Vladimir the Great (1054) 19 February
- Saint Yaroslav the Wise, thrice Grand Prince of Novgorod and Kiev (1054) 28 February
- Saint Ymar, a monk at the monastery of Reculver in Kent in England, martyred by the Danes (c. 830) West, before the Schism 12 November
- Saint Yoakim Krchovski (1820) 10 May
- Righteous Youths John and James, of Meniugi in Novgorod (1566-1569) 24 June
- Venerable Martyr Ypomoni (Hypomoni, Evpomoni) 5 April
- Saint Yrchard (Irchard, Yarcard), a priest in Scotland, consecrated bishop by St Ternan to work among the Picts (5th century) West, before the Schism 24 August