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O
Oakeley, Frederick -- Convert during the Tractarian Movement (1802-1880)
O Antiphons
Oates's Plot
Oaths
Oaths, English Post-Reformation
Oaxaca
Obazine, Monastery of
Obba
Obedience
Obedience, Religious
Obedientiaries
Oblate Sisters of Providence
Oblates of Mary Immaculate
Oblates of St. Francis de Sales
Oblati, Oblatæ, Oblates
Obligation
O'Braein, Tighernach -- Irish annalist and Abbot of Roscommon and Clonmacnoise (d. 1088)
Obregonians -- Congregation of men founded by Bernardino Obregón in 1567
Obreption
O'Brien, Terence Albert
O'Bruadair, David
Observatory, Vatican
O'Callaghan, Edmund Bailey
O'Carolan, Torlogh -- Irish poet (1670-1737)
Occam, William of
Occasionalism -- Metaphysical theory
Occasions of Sin
Occleve, Thomas
Occult Art, Occultism
Occurrence
Oceania, Vicariate Apostolic of Central
Ockham, William of
O'Connell, Daniel
O'Conor, Charles -- American jurist (1804-1884)
O'Conor, Charles -- Irish scholar (1710-1791)
Octave
Octavarium Romanum
O'Cullenan, Gelasius
O'Curry, Eugene
O'Daly, Daniel
O'Daly, Donogh Mór
Odense, Ancient See of Odense -- Located in Denmark
Odescalchi, Carlo
O Deus Ego Amo Te
O'Devany, Cornelius
Odilia, Saint -- Patroness of Alsace (d. about 720)
Odilo, Saint -- Fifth Abbot of Cluny (962-1048)
Odin, John Mary
Odington, Walter
Odo, Saint -- Second Abbot of Cluny (878-942)
Odo, Saint -- Archbishop of Canterbury (d. 959)
O'Donnell, Edmund
O'Donovan, John
Odo of Cambrai, Blessed -- Bishop and confessor (1050-1113)
Odo of Canterbury
Odo of Cheriton
Odo of Glanfeuil
O'Dugan, John
O'Dwyer, Joseph
Œcolampadius, John
Œconomus, Episcopal
Œcumenius
Oertel, John James Maximilian
Oettingen
Offa
Offerings
Offertory
Office, Divine
Office of the Dead
O'Fihely, Maurice
O Filii et Filiæ
Ogdensburg, Diocese of
Oggione, Marco D'
Ogilvie, John, Venerable
Ogliastra
O'Growney, Eugene
O'Hagan, John
O'Hagan, Thomas
O'Hanlon, John
O'Hara, Theodore
O'Hely, Patrick
O'Herlahy, Thomas
O'Higgins, Ambrose and Bernard
Ohio
Ohler, Aloys Karl
O'Hurley, Dermond -- Archbishop of Cashel, Ireland (d. 1584)
O'Hussey, Maelbrighte
Oil of Saints
Oils, Holy
Ointment in Scripture
Ojeda, Alonso de
Okeghem, Jean d'
Oklahoma
Olaf Haraldson, Saint -- Martyr and King of Norway (995-1030)
Oláh, Nicolaus
Olba
Old Catholics
Old Chapter, The
Oldcorne, Ven. Edward
Oldenburg
Old Hall (St. Edmund's College)
Oldham, Hugh
Oldoini, Augustino
Old Testament
Old Testament, Canon of the
O'Leary, Arthur
Olenus
Olesnicki, Zbigniew
Olier, Jean-Jacques
Olinda
Oliva
Oliva, Gian Paolo
Olivaint, Pierre
Oliver, George
Olivet, Mount
Olivetans
Olivi, Pierre Jean
Olivier de la Marche
Ollé-Laprune, Léon
Olmütz
O'Loghlen, Michael
Olympias, Saint
Olympus
Omaha
Ombus
O'Meara, Kathleen
Omer, Saint
Omission
Omnipotence
O'Neill, Hugh
O'Neill, Owen Roe
Onias
Ontario
Ontologism
Ontology
Oostacker, Shrine of
Opening Prayer (in the Mass)
Ophir
Oporto
Oppenordt, Gilles-Marie
Oppido Mamertina
Optatus, Saint -- Fourth-century Numidian bishop
Optimism
Option, Right of
O'Queely, Malachias
Oracle
Oran
Orange, Councils of
Orange Free State
Orange River
Orans
Orate Fratres
Oratorio
Oratory
Oratory of Saint Philip Neri, The
Oratory, French Congregation of the
Orbellis, Nicolas d'
Orcagna
Orcistus
Ordeals
Ordericus Vitalis
Orders, Holy
Orders, The Military
Ordinariate
Ordinary
Ordinos Romani
Oregon
Oregon City
O'Reilly, Bernard -- Historian (1820-1907)
O'Reilly, Edmund -- Archbishop of Armagh (1616-1669)
O'Reilly, Edmund -- Theologian (1811-1878)
O'Reilly, Hugh
O'Reilly, John Boyle
O'Reilly, Myles William Patrick
Oremus
Orense
Oresme, Nicole
Organ
Organic Articles, The
Oria
Oriani, Barnaba
Oriental Study and Research
Orientation of Churches
Orientius
Oriflamme
Origen and Origenism
Original Sin
Orihuela
Oriol, Saint Joseph
Oristano
Orkneys
Orlandini, Niccolò
Orléans
Orléans, Councils of
Orley, Barent Van
Orme, Philibert de l'
Oropus
O'Rorke, Patrick Henry
Orosius, Paulus
Orphans and Orphanages
Orsi, Giuseppe Agostino
Orsini
Orsisius
Ortelius, Abraham
Orthodox Church
Orthodoxy
Orthodoxy, Feast of
Orthosias
Ortolano Ferrarese
Orval
Orvieto
Ory, Matthieu
Osaka
O Salutaris Hostia
Osbald
Osbaldeston, Edward, Venerable
Osbern
Oscott (St. Mary's College)
Osee
Osimo
Oslo, Ancient See of -- Located in Norway
Osma
Osmund, Saint -- Bishop of Salisbury (d. 1099)
Osnabrück
Ossat, Arnaud d' -- French cardinal, diplomat, and writer (1537-1604)
Ossory, Diocese of -- Diocese in Ireland
Ostensorium
Ostia and Velletri
Ostiensis
Ostracine
Ostraka, Christian
Ostrogoths
O'Sullivan Beare, Philip
Oswald, Saint -- Archbishop of York (d. 992)
Oswald, Saint -- King and martyr (605-642)
Oswin, Saint
Otfried of Weissenburg
Othlo
Othmar, Saint
Otho, Marcus Salvius
O'Toole, Saint Lawrence -- Irish confessor (1128-1180)
Otranto
Ottawa, Archdiocese of
Ottawa, University of
Otto, Saint
Otto I, the Great
Otto II
Otto III
Otto IV
Ottobeuren
Otto of Freising
Otto of Passau
Otto of St. Blasien -- Chronicler (d. 1223)
Ouen, Saint -- Archbishop of Rouen (609-683)
Our Father, The
Our Lady, Help of Christians, Feast of
Our Lady of Charity of the Good Shepherd
Our Lady of Good Counsel, Feast of
Our Lady of the Fields, Brothers of
Our Lady of the Snow
Our Lady of Perpetual Help
Our Lady of Perpetual Succour
Overbeck, Friedrich
Overberg, Bernhard Heinrich
Overpopulation, Theories of
Oviedo
Owen, Saint -- Archbishop of Rouen (609-683)
Owen, Saint Nicholas
Oxenford, John
Oxenham, Henry Nutcombe
Oxford
Oxford, University of
Oxford Movement, The
Oxyrynchus
Ozanam, Antoine-Frédéric
Ozanam, Jacques
Ozias
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