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Showing 259 terms beginning with Oakeley to Ozias.
- Frederick Oakeley
- O Antiphons
- Oates's Plot
- Oaths
- English Post-Reformation Oaths
- Oaxaca
- Monastery of Obazine
- Obba
- Obedience
- Religious Obedience
- Obedientiaries
- Oblate Sisters of Providence
- Oblates of Mary Immaculate
- Oblates of Saint Francis de Sales
- Oblati
- Obligation
- Tighernach O'Braein
- Obregonians
- Obreption
- Terence Albert O'Brien
- David O'Bruadair
- Edmund Bailey O'Callaghan
- Torlogh O'Carolan
- Occasionalism
- Occasions of Sin
- Thomas Occleve
- Occult Art, Occultism
- Occurence
- Vicariate Apostolic of Central Oceania
- Daniel O'Connell
- O'Conor, Charles
- Charles O'Conor
- Octavarium Romanum
- Octave
- Gelasius O'Cullenan
- Eugene O'Curry
- Daniel O'Daly
- Donogh Mor O'Daly
- Carlo Odescalchi
- O Deus Ego Amo Te
- Cornelius O'Devany
- St. Odilia
- St. Odilo
- John Mary Odin
- Odington, Walter
- St. Odo
- Saint Odo
- Edmund O'Donnell
- John O'Donovan
- Blessed Odo of Cambrai
- Odo of Canterbury
- Odo of Cheriton
- Odo of Glanfeuil
- John O'Dugan
- Joseph O'Dwyer
- Oecolampadius
- Episcopal Oeconomus
- Oecumenius, Bishop of Trikka
- John James Maximilian Oertel
- Oettingen
- Offa, King of Mercia
- Offerings
- Offertory
- Divine Office
- Office of the Dead
- Maurice O'Fihely
- O Filii Et Filiae
- Diocese of Ogdensburg
- Marco D'Oggione
- Ven. John Ogilvie
- Ogliastra
- Eugene O'Growney
- John O'Hagan
- Thomas O'Hagan
- John O'Hanlon
- Theodore O'Hara
- Patrick O'Hely
- Thomas O'Herlahy
- Ambrose Bernard O'Higgins
- Ohio
- Aloys Karl Ohler
- Dermond O'Hurley
- Maelbrighte O'Hussey
- Oil of Saints
- Ointment in Scripture
- Alonso de Ojeda
- Jean d'Okeghem
- Oklahoma
- St. Olaf Haraldson
- Olah, Nicolaus
- Olba
- Old Catholics
- The Old Chapter
- Ven. Edward Oldcorne
- Oldenburg
- Old Hall (St. Edmund's College)
- Hugh Oldman
- Augustino Oldoini
- Arthur O'Leary
- Olenus
- Zbigniew Olesnicki
- Jean-Jacques Olier
- Olinda
- Oliva
- Gian Paolo Oliva
- Pierre Olivaint
- George Oliver
- Mount Olivet
- Olivetans
- Pierre Jean Olivi
- Olivier de La Marche
- Leon Olle-Laprune
- Olmutz
- Michael O'Loghlen
- St. Olympias
- Olympus
- Diocese of Omaha
- Ombus
- Kathleen O'Meara
- St. Omer
- Omission
- Omnipotence
- Hugh O'Neill
- Owen Roe O'Neill
- Onias
- Ontario
- Ontologism
- Ontology
- Shrine of Oostacker
- Ophir
- Oporto
- Gilles-Marie Oppenordt
- Oppido Mamertina
- St. Optatus
- Optimism
- Right of Option
- Malachias O'Queely
- Oracle
- Diocese of Oran
- Councils of Orange
- Orange Free State
- Orange River, South Africa
- Orans
- Orate Fratres
- Oratorio
- Oratory
- The Oratory of Saint Philip Neri
- French Congregation of the Oratory
- Nicolas d'Orbellis
- Orcagna
- Orcistus
- Ordeals
- Ordericus Vitalis
- Holy Orders
- Ordinariate
- Ordinary
- Ordines Romani
- Oregon
- Oregon City
- Bernard O'Reilly
- Edmund O'Reilly
- Edmund O'Reilly
- Hugh O'Reilly
- John Boyle O'Reilly
- Myles William Patrick O'Reilly
- Oremus
- Orense
- Nicole Oresme
- Organ
- Oria
- Barnaba Oriani
- Oriental Study and Research
- Orientation of Churches
- Orientius
- Oriflamme
- Origen and Origenism
- Original Sin
- Orihuela
- Saint Joseph Oriol
- Oristano
- Orkneys
- Niccolo Orlandini
- Councils of Orleans
- Diocese of Orleans
- Barent van Orley
- Philibert de l'Orme
- Oropus
- Patrick Henry O'Rorke
- Paulus Orosius
- Orphans and Orphanages
- Orsi, Giuseppe Agostino
- Orsini
- Orsisius
- Abraham Ortelius
- Orthodox Church
- Orthodoxy
- Feast of Orthodoxy
- Orthosias, Titular See of
- Ortolano Ferrarese
- Orval
- Orvieto
- Matthieu Ory
- Osaka
- O Salutaris Hostia
- Osbald
- Ven. Edward Osbaldeston
- Osbern
- Oscott (St. Mary's College)
- Osee
- Osimo
- Osma
- St. Osmund
- Osnabrueck
- Arnaud d'Ossat
- Diocese of Ossory
- Ostensorium
- Ostia and Velletri
- Ostiensis
- Ostracine
- Christian Ostraka
- Ostrogoths
- Philip O'Sullivan Beare
- St. Oswald
- St. Oswald
- St. Oswin
- Otfried of Weissenburg
- Othlo
- St. Othmar
- Marcus Salvius Otho
- Otranto
- Archdiocese of Ottawa
- University of Ottawa
- Saint Otto
- Otto I (The Great)
- Otto II
- Otto III
- Otto IV
- Ottobeuren
- Otto of Freising
- Otto of Passau
- Otto of Blasien
- St. Ouen
- Feast of Our Lady, Help of Christians
- Feast of Our Lady of Good Counsel
- Brothers of Our Lady of the Fields
- Our Lady of the Snow
- Friedrich Overbeck
- Overberg, Bernhard Heinrich
- Oviedo, Diocese of
- St. Nicholas Owen
- John Oxenford
- Henry Nutcombe Oxenham
- Oxford
- University of Oxford
- The Oxford Movement (1833-1845)
- Oxyrynchus
- Antoine-Frederic Ozanam
- Ozanam, Jacques
- Ozias
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