Religious figures
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- Olaus PetriOlof Persson, sometimes Petersson (6 January 1493 – 19 April 1552), better known under the
- Old CalendaristsGroup of traditionalist Eastern Orthodox bodies
- Oldenburg in HolsteinOldenburg in Holstein (German: ) is a German town at the southwestern shore of the Baltic
- OmophorionBishop's scarf in Eastern Orthodoxy and Eastern Catholicism
- Oral RobertsAmerican religious leader (1918–2009)
- Organization of the Eastern Orthodox ChurchThe Eastern Orthodox Church, officially the Orthodox Catholic Church and commonly known si
- OrigenChristian theologian (c. 185 – c. 253)
- Orthodox brotherhoodReligious group
- Orthodox Church in AmericaEastern Orthodox church in North America
- Orthodox Church in JapanThe Orthodox Church in Japan or Orthodox Church of Japan (Japanese: 日本ハリストス正教会, romanized:
- Orthodox Church of FinlandAutonomous Eastern Orthodox archdiocese
- Orthodox Church of the Czech Lands and SlovakiaEastern Orthodox jurisdiction
- Orthodox Church of UkraineEastern Orthodox church in Ukraine (contested)
- Orthodox Inter-Seminary MovementThe Orthodox Inter-Seminary Movement (OISM) was founded in the 1960s to foster prayer, fel
- Orthodox Presbyterian ChurchThe Orthodox Presbyterian Church (OPC) is a confessional Presbyterian denomination located
- Óscar RomeroArchbishop of San Salvador from 1977 to 1980
- Óscar Vicente Ojea QuintanaOscar Vicente Ojea Quintana (15 October 1946) is an Argentine prelate of the Catholic Chur
- OshoIndian mystic (1931–1990)
- OudewaterOudewater (Dutch pronunciation: ) is a municipality and a city in the Netherlands.
- Our Lady of GuadalupeMarian apparitions in December 1531
- OusiaTerm in ancient Greek philosophy and Christian theology
- Ovadia YosefTalmudic scholar, posek and Sephardi Chief Rabbi of Israel from 1973 to 1983