Catholic Encyclopedia - O
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O'Braein, Tighernach
O'Brien, Terence Albert
O'Bruadair, David
O'Callaghan, Edmund Bailey
O'Carolan, Torlogh
O'Connell, Daniel
O'Conor, Charles
O'Conor, Charles (2nd entry)
O'Cullenan, Gelasius
O'Curry, Eugene
O'Daly, Daniel
O'Daly, Donogh Mor
O'Devany, Cornelius
O'Donnell, Edmund
O'Donovan, John
O'Dugan, John
O'Dwyer, Joseph
O'Fihely, Maurice
O'Growney, Eugene
O'Hagan, John
O'Hagan, Thomas
O'Hanlon, John
O'Hara, Theodore
O'Hely, Patrick
O'Herlahy, Thomas
O'Higgins, Ambrose Bernard
O'Hurley, Dermond
O'Hussey, Maelbrighte
O'Leary, Arthur
O'Loghlen, Michael
O'Meara
O'Neill, Hugh
O'Neill, Owen Roe
O'Queely, Malachias
O'Reilly, Bernard
O'Reilly, Edmund
O'Reilly, Edmund (2nd entry)
O'Reilly, Hugh
O'Reilly, John Boyle
O'Reilly, Myles William Patrick
O'Rorke, Patrick Henry
O'Sullivan Beare, Philip
O'Toole, Saint Lawrence
O Antiphons
O Deus Ego Amo Te
O Filii et Filiae
O Salutaris Hostia
Oakeley, Frederick
Oatess Plot
Oaths, English Post-Reformation
Oaths
Oaxaca
Obazine, Monastery of
Obba
Obedience, Religious
Obedience
Obedientiaries
Oblate Sisters of Providence
Oblates of Mary Immaculate
Oblates of Saint Francis de Sales
Oblati
Obligation
Obregonians
Obreption
Observatory, Vatican
Occasionalism
Occasions of Sin
Occleve, Thomas
Occult Art, Occultism
Occurrence
Oceania, Vicariate Apostolic of Central
Ockham, William of
Octavarium Romanum
Octave
Odense in Denmark, Ancient See of
Odescalchi, Carlo
Odilia, Saint
Odilo, Saint
Odin, John Mary
Odington, Walter
Odo, Saint
Odo, Saint (2nd entry)
Odo of Cambrai, Blessed
Odo of Canterbury
Odo of Cheriton
Odo of Glanfeuil
Oecolampadius, John
Oeconomus, Episcopal
Oecumenius
Oertel, John James Maximilian
Oettingen
Offa
Offerings
Offertory
Office, Divine
Office of Dead
Ogdensburg, Diocese of
Ogilvie, Venerable John
Ogliastra
Ohio
Ohler, Aloys Karl
Oil of Saints
Oils, Holy
Ointment in Scripture
Ojeda, Alonso de
Oklahoma
Olaf Haraldson, Saint
Olah, Nicolaus
Olba
Old Catholics
Old Chapter
Old Hall
Old Testament, Canon of
Old Testament
Oldcorne, Venerable Edward
Oldenburg
Oldham, Hugh
Oldoini, Augustino
Olenus
Olesnicki, Zbigniew
Olier, Jean-Jacques
Olinda
Oliva, Gian Paolo
Oliva
Olivaint, Pierre
Oliver, George
Olivet, Mount
Olivetans
Olivi, Pierre Jean
Olivier de la Marche
Olle-Laprune, Leon
Olmutz
Olympias, Saint
Olympus
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Omaha, Diocese of
Ombus
Omer, Saint
Omission
Omnipotence
Onias
Ontario
Ontologism
Ontology
Oostacker, Shrine of
Ophir
Oporto
Oppenordt, Gilles-Marie
Oppido Mamertina
Optatus, Saint
Optimism
Option, Right of
Oracle
Oran
Orange, Councils of
Orange Free State
Orange River, Vicariate Apostolic of
Orans
Orate Fratres
Oratorio
Oratory, French Congregation of
Oratory
Oratory of Saint Philip Neri
Orcagna
Orcistus
Ordeals
Ordericus Vitalis
Orders, Holy
Orders, Military
Ordinariate
Ordinary
Ordinos Romani
Oregon
Oregon City, Archdiocese of
Oremus
Orense, Diocese of
Oresme, Nicole
Organ
Organic Articles
Oria, Diocese of
Oriani, Barnaba
Oriental Study and Research
Orientation of Churches
Orientius
Oriflamme
Origen and Origenism
Original Sin
Orihuela
Oriol, Saint Joseph
Oristano
Orkneys
Orlandini, Niccolo
Orleans, Councils of
Orleans, Diocese of
Orley, Barent Van
Oropus
Orosius, Paulus
Orphans and Orphanages
Orsi, Giuseppe Agostino
Orsini
Orsisius
Ortelius, Abraham
Orthodox Church
Orthodoxy, Feast of
Orthodoxy
Orthosias
Ortolano Ferrarese
Orval
Orvieto
Ory, Matthieu
Osaka
Osbald
Osbaldeston, Venerable Edward
Osbern
Oscott
Osee
Osimo
Oslo in Norway, Ancient See of
Osma, Diocese of
Osmund, Saint
Osnabruck, Diocese of
Ossory, Diocese of
Ostensorium
Ostia and Velletri
Ostiensis
Ostracine
Ostraka, Christian
Ostrogoths
Oswald, Saint
Oswald, Saint (2nd entry)
Oswin, Saint
Otfried of Weissenburg
Othlo
Othmar, Saint
Otho, Marcus Salvius
Otranto
Ottawa, University of
Ottawa
Otto, Saint
Otto I, Great
Otto II
Otto III
Otto IV
Otto of Freising
Otto of Passau
Otto of St Blasien
Ottobeuren
Ouen, Saint
Our Father
Our Lady, Help of Christians, Feast of
Our Lady of Charity of Good Shepherd
Our Lady of Fields, Brothers of
Our Lady of Good Counsel, Feast of
Our Lady of Perpetual Succour
Our Lady of Snow
Overbeck, Friedrich
Overberg, Bernhard Heinrich
Oviedo, Diocese of
Owen, Nicholas
Oxenford, John
Oxenham, Henry Nutcombe
Oxford, University of
Oxford
Oxford Movement
Oxyrynchus
Ozanam, Antoine-Frederic
Ozanam, Jacques
Ozias
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