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- Isyhios (Condogiannis) of Capitoliad
- Ivan Fyodorov
- Ivan Fyodorov (printer)
- Ivan IV of Russia
- Ivan Ivanovich Melissino
- Ivan Kolchin
- Ivan Ladizinsky
- Ivan the terrible
- Iveron Mother of God
- Iviron Monastery (Athos)
- Jack Witbrock
- Jacob's Well
- Jacob's Well (Nablus, West Bank)
- Jacob (disambiguation)
- Jacob Baradaeus
- Jacob Netsvetov
- Jacob of Edessa
- Jacob of Hamatoura
- Jacob of Nisibis
- Jacob of Serugh
- Jacobite
- Jacobites
- Jakob (Akkersdijk)
- Jakob (Akkersdijk) of The Hague
- Jakub (Kostiuczuk) of Bialystok and Gdansk
- James
- James (Kapenekas) of Skythopolis
- James (Kostiuczuk) of Bialystok
- James (Toombs) of Manhattan
- James Bernstein
- James the Ascetic
- James the Faster
- James the Just
- January 1
- January 10
- January 11
- January 12
- January 13
- January 14