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- Irina Yamashita
- Irinej (Dobrijevic) of Australia and New Zealand
- Irinej (Gavrilovic) of Serbia
- Irinej (Gavrilović) of Serbia
- Irineu (Duvlea) of Dearborn Heights
- Irinios (Athanasiadis) of Crete
- Irmos
- Irénée (Rochon)
- Irénée (Rochon) of Ottawa
- Irénée (Rochon) of Quebec City
- Irénée (Rochon) of Québec City
- Isaac
- Isaac II of Optina
- Isaac I of Optina
- Isaac of Dalmatia
- Isaac of Monteluco
- Isaac of Syria
- Isaac the Confessor
- Isaac the Great
- Isaac the Recluse
- Isaac the Syrian
- Isabel Hapgood
- Isaiah
- Isaiah (Chronopoulos) of Denver
- Isaiah (Kykkotis) of Tamassos
- Isaias I of Constantinople
- Isaias of Tamassos and Orinis
- Isidor (Nikolsky) of St. Petersburg and Novgorod
- Isidore (Kolokolov) of Mikhailov
- Isidore (Nikolsky) of St. Petersburg
- Isidore II of Constantinople
- Isidore I Buchiras of Constantinople
- Isidore of Chios
- Isidore of Pelusium
- Isidore of Seville
- Isidore of Yuriev
- Isidore the Apostate
- Islam
- Israel
- 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
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- Japan
- Japanese Orthodoxy
- Jarlath of Tuam
- Jaroslav Pelican
- Jaroslav Pelikan
- Jasper
- Jean-Claude Larchet
- Jean-Nectaire (Kovalesky) of Saint-Denis
- Jean-Nectaire (Kovalevsky) of Saint-Denis
- Jefrem
- Jefrem (Miluntinovic) of Banja Luka
- Jefrem (Milutinovic) of Banja Luka
- Jefrem (Milutinović) of Banja Luka
- Jehovah's Witnesses
- Jeremiah (Ancimiuk) of Wroclaw
- Jeremiah (Fountas) of Gortyna
- Jeremias III of Constantinople
- Jeremias II (Tranos) of Constantinople
- Jeremias II Tranos of Constantinople
- Jeremias I of Constantinople
- Jerermiah of Kazan
- Jerome
- Jerome (Shaw)
- Jerome (Shaw) of Manhattan
- Jeronim (Chernov) of Detroit
- Jerusalem
- Jerusalem rite
- Jesus
- Jesus Christ
- Jesus Prayer
- Jevstatije II of Pec
- Jevstatije II of Peć
- Jim Forest
- Jizya
- Joachim (Alexopoulos) of Boston
- Joachim (Alexopoulos) of Demetrias
- Joachim (Levitsky) of Nizhny Novgorod
- Joachim (Neradjoulis) of Chalcedon
- Joachim (Nicholaides) of St. Anne's Skete
- Joachim (Phoropoulos) of Pelagonia
- Joachim (Ross)
- Joachim (Savelov) of Moscow
- Joachim (Savyolov) of Moscow
- Joachim III of Constantinople
- Joachim II of Constantinople
- Joachim II of Constsntinople
- Joachim I of Alexandria
- Joachim Korsunianin of Novgorod
- Joachim and Anna
- Joachim of Vatopaidi
- Joanicius
- Joanicius II of Pec
- Joanicius II of Peć
- Joanicius I of Pec
- Joanicius I of Peć
- Joanikije
- Joanikije (Lipovac) of Montenegro
- Joanikije of Montenegro
- Joanna
- Joannicius (disambiguation)
- Joannicius I of Pec
- Joannicius of Alexandria
- Joannicus I of Constantinople
- Joannicus and Sophronius Likhud
- Joasaph (Bolotov) of Kodiak
- Joasaph (Skorodumov) of Buenos Aires
- Joasaph (Skorodumov) of Canada and Argentina
- Joasaph (Udalov) of Chistopol
- Joasaph II (Novotorzhets) of Moscow
- Joasaph II of Constantinople
- Joasaph I of Constantinople
- Joasaph of Edmonton
- Joasaphus I of Moscow
- Job
- Job (Boretsky) of Kiev
- Job (Getcha)
- Job (Getcha) of Telmessos
- Job (Kresovich) of Kazan
- Job (Osacky) of Chicago
- Job (Smakouz) of Kashira
- Job (Tyvonyuk) of Chelyabinsk
- Job (disambiguation)
- Job I of Antioch
- Job of Moscow
- Job of Pochaev
- Job the Long-suffering
- Joel (Fragkakis) of Edessa
- John
- John (Abdalah) of Worcester
- John (Abdalah) of Worcester and New England
- John (Alexeev)
- John (Berzins) of Caracas
- John (Bodnachuk)
- John (Bodnarchuk) of Zhytomyr
- John (Bērziņš)
- John (Bērziņš) of Caracas
- John (Derewianka) of Parnassus
- John (Garklavs) of Chicago
- John (Kallos) of Amorion
- John (Kallos) of Amorium
- John (Kallos) of Amoriun
- John (Karastamatis) of Santa Cruz
- John (Krestiankin)
- John (Martin) of Nyssa
- John (Maximovitch) of San Francisco
- John (Maximovitch) of Shanghai
- John (Maximovitch) the Wonderworker
- John (Mitropolsky) of the Aleutians
- John (Pommers) of Riga
- John (Rinne) of Nicea
- John (Roshchin)
- John (Roshchin) of Naro-Fominsk
- John (Shahovskoy) of San Francisco
- John (Snychev) of St. Petersburg
- John (Snychov) of St. Petersburg
- John (Stinka) of Winnipeg
- John (Wendland) of New York and the Aleutians
- John (Yazigi) of Western Europe
- John (Yazigi) of al-Hosn
- John (Zachariou) of Johannesburg
- John (Ziobin) of Alaska
- John (Zizioulas) of Pergamon
- John (Zlobin)
- John (Zlobin) of Alaska
- John (disambiguation)
- John A. Jillions
- John Anthony McGuckin
- John Behr
- John Breck
- John Cassian
- John Chrysostom
- John Chryssavgis
- John Climacus
- John Granger
- John H. Erickson
- John III Doukas Vatatzes
- John III Vatatzes
- John III of Alexandria
- John III of Jerusalem
- John II Cappadocia of Constantinople
- John II of Alexandria
- John II of Jerusalem
- John II of Novgorod
- John II of Rome
- John IV of Constantinople
- John IX of Rome
- John I Talaia of Alexandria
- John I of Antioch
- John I of Jerusalem
- John James the Chozebite
- John Jillions
- John Karastamatis of Santa Cruz
- John Kass
- John Kochurov
- John Krestiankin
- John Maximovitch
- John Maximovitch of Tobolsk
- John Meyendorff
- John Naukliros
- John Nehrebecki
- John Paul I
- John Paul II
- John S. Romanides
- John Scholasticus
- John Scottus Eriugena
- John Shehadie
- John Tavener
- John VIII of Rome
- John VII Grammaticus of Constantinople
- John VII of Jerusalem
- John VII of Rome
- John VII the Oxite
- John VI of Constantinople
- John V of Constantinople
- John V of Jerusalem
- John Vatatzes the Merciful
- John XIV Kalekas of Constantinople
- John XI Bekkos of Constantinople
- John XVIII of Rome
- John XVII of Rome
- John XVI of Rome
- John X (Camateros) of Constantinople
- John X (Yazigi) of Antioch
- John X of Rome
- John Zizioulas
- John and Ann Betar
- John behr
- John of Antioch
- John of Beverley
- John of Beverly
- John of Damascus
- John of Kronstadt
- John of Mardin
- John of Novgorod and Wonderworker
- John of Phanidjoit
- John of Riga
- John of Rila
- John of Sedre
- John of Vilna
- John of the Ladder
- John the Baptist
- John the Cantor
- John the Faster
- John the Forerunner
- John the Hairy
- John the Merciful
- John the New of Ioannina
- John the New of Suceava
- John the Russian
- John the Silent
- John the Theologian
- John the Wonderworker
- John the Wonderworker of San Francisco and Shanghai
- Joint International Commission for the Theological Dialogue between the Roman Catholic Church and the Orthodox Church
- Jon Braun
- Jon E. Braun
- Jonah
- Jonah (Karpukhin) of Astrakhan and Kamyzyak
- Jonah (Lwanga) of Kampala
- Jonah (Lwanga) of Kampala and All Uganda
- Jonah (Paffhausen)
- Jonah (Paffhausen) of Fort Worth
- Jonah (Paffhausen) of Washington
- Jonah (Paffhausen) of Washington and New York
- Jonah (Stahlberg) of Washington
- Jonah (Stalberg)
- Jonah (disambiguation)
- Jonah of Manchuria
- Jonah of Moscow
- Jonas of Moscow
- Jonathan (Tsvetkov) of Abakan
- Josaphat
- Jose (Cortes y Olmos) of Mexico City
- Jose Muñoz-Cortes
- Joseph (Al-Zehlaoui) of Los Angeles
- Joseph (Al-Zehlaoui) of New York
- Joseph (Bosakov) of America and Australia
- Joseph (Harkiolakis)
- Joseph (Harkiolakis) of New Zealand
- Joseph (Harkiolakis) of Proikonnisos
- Joseph (Jandieri) the Wonderworker
- Joseph (Litovkin) of Optina