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- Koliva
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- Kollyvades Movement
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- Konstamonitou Monastery (Athos)
- Konstantin I of Kiev
- Konstantios (Karatzopoulos) II of Trebizond
- Kontakion
- Kosmas Aitolos
- Kosmas the Aetolian
- Koukoulion
- Kourbania
- Koutloumousiou Monastery (Athos)
- Kursk Root Hermitage
- Kursk Root Icon
- Kursk Root Icon of the Mother of God of the Sign
- Kursk Root icon
- Kutia
- Kutya
- Kyprian (Pyzhov)
- Kyprianos of Alexandria
- Kyprianos of Cyprus
- Kyriakos (Georgopetris) of Nazareth
- Kyrill (Dmitrieff)
- Kyrill (Dmitrieff) of San Francisco
- Kyrill (Gundyayev) of Moscow
- Kyrill (Gundyayev) of Smolensk
- Kyrill (Smirnov) of Kazan
- Kyrill (Yonchev) of Pittsburgh
- Kyrill I (Gundyayev) of Moscow
- Kyrillos (Economopoulos) of Nakratis
- Kyrillos (Economopoulos) of Naucratis
- Kyrillos (Misiakoulis) of Kifissia, Amaroussion and Oropos
- Kyrillos III of Cyprus
- Kyrillos II (Christakis) of Thessaliotis
- Kyrillos II (Papadopoulos) of Cyprus
- Kyrillos I (Karmpaliotis) of Thessaliotis
- Kyrillos Katerelos
- Kyriopascha
- LXX
- LYNETTE HOPPE
- Labarum
- Lacu Skete (Athos)
- Ladder
- Ladder of Divine Ascent
- Ladder of Divine Ascent Icon
- Ladder of Divine Ascent icon
- Laicization
- Laity
- Lalibela of Ethiopia
- Lampadarios
- Lando of Rome
- Last Supper icon
- Lateran Council
- Latin Rite
- Latinization
- Latvian Orthodox Church
- Laura of Cordoba
- Laurence
- Laurence II of Kazan
- Laurence I of Kazan
- Laurence of Byzantium
- Laurence of Canterbury
- Laurus (Skurla) of New York
- Laurus (Škurla) of New York
- Laurus (Škurla) of Syracuse
- Lavra
- Law
- Law of God Seraphim Slobosdkoy
- Law of Moses
- Lawrence
- Lawrence of Canterbury
- Lawrence of Rome
- Lay
- Lazar (Puhalo) of Ottawa
- Lazar of Serbia
- Lazarus
- Lazarus (Moore)
- Lazarus Saturday
- Leavetaking
- Lectionary
- Lector
- Lent
- Lenten Triodion
- Lentulus Letter
- Leo-Luke of Corleone
- Leo (Makkonen) of Finland
- Leo (Tserpitsky) of Novgorod
- Leo III of Rome
- Leo III the Isaurian
- Leo II of Rome
- Leo IV of Rome
- Leo IV the Khazar
- Leo Luke
- Leo Styppeiotes of Constantinople
- Leo VI
- Leo VI the Wise
- Leo the Great
- Leoluca
- Leonid (Okropiridze) of Georgia
- Leonid Alexandrovich Ouspensky
- Leonid of Optina
- Leonidas C. Contos
- Leontios (Englistriotis) of Chytroi
- Leontios of Cyprus
- Leontius II of Jerusalem
- Leontius I of Jerusalem
- Leonty (Filippovich) of Chile
- Leonty (Turkevich) of Chicago
- Leonty (Turkevich) of New York
- Letter of Lentulus
- Lev Gillet
- Leviticus
- Libya
- Life-Giving Font
- Life-Giving Spring
- Life-giving Fount of the Theotokos
- Lifegiving Font
- Ligonier Meeting
- Lindisfarne
- Lindisfarne Gospels
- Lintula
- Linus of Rome
- Lipovan Orthodox Old-Rite Church
- Lipovan Orthodox Oldritualist Church
- List of American Orthodox saints
- List of American bishops
- List of American monasteries
- List of American saints
- List of American writers
- List of Archbishops of Athens
- List of Archbishops of Cyprus
- List of Archbishops of Finland
- List of Australian monasteries
- List of Bishops in Byzantine Egypt (A.D. 325 to c.750)
- List of Bishops of Hierapolis
- List of Bishops of Hierapolis in Asia
- List of Bishops of Hierapolis of Phrygia
- List of Bulgarian saints
- List of Byzantine Emperors
- List of Canadian monasteries
- List of Catholicoses of Georgia
- List of Coptic Orthodox Churches in Australia
- List of Coptic Orthodox Popes of Alexandria
- List of Coptic Popes
- List of English-speaking parishes in Australia
- List of Faculty of St. Andrew's Greek Orthodox Theological College (Sydney, Australia)
- List of Finnish Archbishops
- List of Finnish monasteries
- List of French monasteries
- List of Live Streams of Orthodox Christian Church Services
- List of Macedonian Orthodox parishes in Australia
- List of Metropolitans and Bishops of Banja Luka
- List of Metropolitans of Japan
- List of Metropolitans of Kiev
- List of Metropolitans of Poland
- List of Metropolitens and Bishops of Banja Luka
- List of Orthodox Internet communities
- List of Orthodox UNESCO World Heritage Sites
- List of Parishes in Canada
- List of Patriarchs
- List of Patriarchs of Alexandria
- List of Patriarchs of Antioch
- List of Patriarchs of Constantinople
- List of Patriarchs of Jerusalem
- List of Patriarchs of Serbia
- List of Popes of Rome
- List of Primates of Russia
- List of Primates of the Archdiocese of Crete
- List of ROAC Parishes
- List of ROAC Parishes in America
- List of Romanian Saints
- List of Serbian Saints
- List of Serbian saints
- List of Western-Rite parishes in Australasia
- List of autocephalous and autonomous Churches
- List of autocephalous and autonomous churches
- List of bishiops of the Russian Orthodox Church Outside Russia
- List of bishops in Australasia
- List of bishops in Finland
- List of bishops of the Diocese of Kazan
- List of bishops of the Diocese of Novgorod
- List of bishops of the Russian Orthodox Church Outside Russia
- List of leaders of Georgian Church
- List of modern iconographers
- List of parishes in Alberta (Canada)
- List of parishes in Atlantic provinces (Canada)
- List of parishes in Belgium
- List of parishes in British Columbia (Canada)
- List of parishes in Fiji
- List of parishes in Iceland
- List of parishes in Japan
- List of parishes in Manitoba
- List of parishes in Manitoba (Canada)
- List of parishes in Maritimes (Canada)
- List of parishes in New South Wales
- List of parishes in New Zealand