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- Justin II
- Justin Martyr
- Justin Popovich
- Justin the Philosopher
- Justinian
- Justinian (Ovchinnikov) of Kalmykia and Elista
- Justinian (Ovchinnikov) of Naro-Fominsk
- Justinian I
- Justinian II
- Justinian of Ramsey Island
- Justinian the Great
- Justus
- Justus of Canterbury
- Juvenal of Alaska
- Juvenal of Jerusalem
- Juvenaly (Kilin) of Izhevsk
- Juvenaly (Kilin) of Qiqihar
- Juvenaly (Poyarkov) of Krutitsy
- Juvenaly of Alaska
- Kafsokalyvia Skete (Athos)
- Kalinik I of Pec
- Kallinikos (Pippas) of Pelusium
- Kallinikos (Pippas) of Pilousion
- Kallinikos of Asia
- Kalliopius
- Kallistite Synod
- Kallistos (Papageorgapoulos) of San Francisco
- Kallistos (Papageorgopoulos) of San Francisco
- Kallistos (Samaras)
- Kallistos (Samaras) of Zelon
- Kallistos (Ware) of Diokleia
- Kallistos Ware
- Kallistos of Zelon
- Kamennoi
- Kamennoi Monastery
- Kamenny Monastery
- Kamilavka
- Karakalou Monastery (Athos)
- Karl Krumbacher
- Karras Valerie A
- Karterios
- Karyes (Athos)