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• O Antiphons

  http://www.newadvent.org/cathen/11173b.htm
  (Catholic Encyclopedia)

• O Deus Ego Amo Te

  http://www.newadvent.org/cathen/11206c.htm
  (Catholic Encyclopedia)

• O Filii et Filiae

  http://www.newadvent.org/cathen/11221b.htm
  (Catholic Encyclopedia)

• O Salutaris Hostia

  http://www.newadvent.org/cathen/11334a.htm
  (Catholic Encyclopedia)

• O'Braein, Tighernach

  http://www.newadvent.org/cathen/11193a.htm
  (Catholic Encyclopedia)

• O'Brien, Terence Albert

  http://www.newadvent.org/cathen/11193d.htm
  (Catholic Encyclopedia)

• O'Bruadair, David

  http://www.newadvent.org/cathen/11193e.htm
  (Catholic Encyclopedia)

• O'Callaghan, Edmund Bailey

  http://www.newadvent.org/cathen/11194a.htm
  (Catholic Encyclopedia)

• O'Carolan, Torlogh

  http://www.newadvent.org/cathen/11195a.htm
  (Catholic Encyclopedia)

• O'Connell, Daniel

  http://www.newadvent.org/cathen/11200c.htm
  (Catholic Encyclopedia)

• O'Conor, Charles

  http://www.newadvent.org/cathen/11202a.htm
  The son of Irish immigrants, he was an eminent New York lawyer and orator. He defended Jefferson Davis and prosecuted Boss Tweed. Died 1884.

• O'Conor, Charles

  http://www.newadvent.org/cathen/11203a.htm
  Called "the Venerable." Eighteenth-century Irish antiquarian.

• O'Cullenan, Gelasius

  http://www.newadvent.org/cathen/11205a.htm
  (Catholic Encyclopedia)

• O'Curry, Eugene

  http://www.newadvent.org/cathen/11205b.htm
  (Catholic Encyclopedia)

• O'Daly, Daniel

  http://www.newadvent.org/cathen/11205c.htm
  (Catholic Encyclopedia)

• O'Daly, Donogh Mór

  http://www.newadvent.org/cathen/11206a.htm
  (Catholic Encyclopedia)

• O'Devany, Cornelius

  http://www.newadvent.org/cathen/11207a.htm
  (Catholic Encyclopedia)

• O'Donnell, Edmund

  http://www.newadvent.org/cathen/11210b.htm
  (Catholic Encyclopedia)

• O'Donovan, John

  http://www.newadvent.org/cathen/11210c.htm
  (Catholic Encyclopedia)

• O'Dugan, John

  http://www.newadvent.org/cathen/11212c.htm
  (Catholic Encyclopedia)

• O'Dwyer, Joseph

  http://www.newadvent.org/cathen/11212d.htm
  (Catholic Encyclopedia)

• O'Fihely, Maurice

  http://www.newadvent.org/cathen/11221a.htm
  (Catholic Encyclopedia)

• O'Growney, Eugene

  http://www.newadvent.org/cathen/11224a.htm
  (Catholic Encyclopedia)

• O'Hagan, John

  http://www.newadvent.org/cathen/11224b.htm
  (Catholic Encyclopedia)

• O'Hagan, Thomas

  http://www.newadvent.org/cathen/11224c.htm
  (Catholic Encyclopedia)

• O'Hanlon, John

  http://www.newadvent.org/cathen/11224d.htm
  (Catholic Encyclopedia)

• O'Hara, Theodore

  http://www.newadvent.org/cathen/11224e.htm
  (Catholic Encyclopedia)

• O'Hely, Patrick

  http://www.newadvent.org/cathen/11225a.htm
  (Catholic Encyclopedia)

• O'Herlahy, Thomas

  http://www.newadvent.org/cathen/11225b.htm
  (Catholic Encyclopedia)

• O'Higgins, Ambrose and Bernard

  http://www.newadvent.org/cathen/11225c.htm
  (Catholic Encyclopedia)

• O'Hurley, Dermond

  http://www.newadvent.org/cathen/11228b.htm
  (Catholic Encyclopedia)

• O'Hussey, Maelbrighte

  http://www.newadvent.org/cathen/11228c.htm
  (Catholic Encyclopedia)

• O'Leary, Arthur

  http://www.newadvent.org/cathen/11240a.htm
  (Catholic Encyclopedia)

• O'Loghlen, Michael

  http://www.newadvent.org/cathen/11248a.htm
  (Catholic Encyclopedia)

• O'Meara, Kathleen

  http://www.newadvent.org/cathen/11250b.htm
  (Catholic Encyclopedia)

• O'Neill, Hugh

  http://www.newadvent.org/cathen/11252a.htm
  (Catholic Encyclopedia)

• O'Neill, Owen Roe

  http://www.newadvent.org/cathen/11253a.htm
  (Catholic Encyclopedia)

• O'Queely, Malachias

  http://www.newadvent.org/cathen/11264b.htm
  (Catholic Encyclopedia)

• O'Reilly, Bernard

  http://www.newadvent.org/cathen/11293b.htm
  (Catholic Encyclopedia)

• O'Reilly, Edmund (Archbishop of Armagh)

  http://www.newadvent.org/cathen/11293c.htm
  (Catholic Encyclopedia)

• O'Reilly, Edmund (Theologian)

  http://www.newadvent.org/cathen/11294a.htm
  (Catholic Encyclopedia)

• O'Reilly, Hugh

  http://www.newadvent.org/cathen/11294b.htm
  (Catholic Encyclopedia)

• O'Reilly, John Boyle

  http://www.newadvent.org/cathen/11294c.htm
  (Catholic Encyclopedia)

• O'Reilly, Myles William Patrick

  http://www.newadvent.org/cathen/11294d.htm
  (Catholic Encyclopedia)

• O'Rorke, Patrick Henry

  http://www.newadvent.org/cathen/11321c.htm
  (Catholic Encyclopedia)

• O'Sullivan Beare, Philip

  http://www.newadvent.org/cathen/11348a.htm
  (Catholic Encyclopedia)

• Oakeley, Frederick

  http://www.newadvent.org/cathen/11173a.htm
  (Catholic Encyclopedia)

• Oates's Plot

  http://www.newadvent.org/cathen/11173c.htm
  (Catholic Encyclopedia)

• Oaths

  http://www.newadvent.org/cathen/11176a.htm
  (Catholic Encyclopedia)

• Oaths, English Post-Reformation

  http://www.newadvent.org/cathen/11177a.htm
  (Catholic Encyclopedia)

• Oaxaca

  http://www.newadvent.org/cathen/11180a.htm
  (Catholic Encyclopedia)

• Obazine, Monastery of

  http://www.newadvent.org/cathen/11181a.htm
  (Catholic Encyclopedia)

• Obba

  http://www.newadvent.org/cathen/11181b.htm
  (Catholic Encyclopedia)

• Obedience

  http://www.newadvent.org/cathen/11181c.htm
  (Catholic Encyclopedia)

• Obedience, Religious

  http://www.newadvent.org/cathen/11182a.htm
  (Catholic Encyclopedia)

• Obedientiaries

  http://www.newadvent.org/cathen/11183a.htm
  (Catholic Encyclopedia)

• Oblate Sisters of Providence

  http://www.newadvent.org/cathen/11184a.htm
  (Catholic Encyclopedia)

• Oblates of Mary Immaculate

  http://www.newadvent.org/cathen/11184b.htm
  (Catholic Encyclopedia)

• Oblates of Saint Francis de Sales

  http://www.newadvent.org/cathen/11187a.htm
  (Catholic Encyclopedia)

• Oblati, Oblatae, Oblates

  http://www.newadvent.org/cathen/11188a.htm
  (Catholic Encyclopedia)

• Obligation

  http://www.newadvent.org/cathen/11189a.htm
  (Catholic Encyclopedia)

• Obregonians

  http://www.newadvent.org/cathen/11193b.htm
  (Catholic Encyclopedia)

• Obreption

  http://www.newadvent.org/cathen/11193c.htm
  (Catholic Encyclopedia)

• Occasionalism

  http://www.newadvent.org/cathen/11195b.htm
  (Catholic Encyclopedia)

• Occasions of Sin

  http://www.newadvent.org/cathen/11196a.htm
  (Catholic Encyclopedia)

• Occult Art, Occultism

  http://www.newadvent.org/cathen/11197b.htm
  (Catholic Encyclopedia)

• Octavarium Romanum

  http://www.newadvent.org/cathen/11203b.htm
  (Catholic Encyclopedia)

• Octave

  http://www.newadvent.org/cathen/11204a.htm
  (Catholic Encyclopedia)

• Odense, Ancient See of

  http://www.newadvent.org/cathen/16064d.htm
  (Catholic Encyclopedia)

• Odescalchi, Carlo

  http://www.newadvent.org/cathen/11206b.htm
  (Catholic Encyclopedia)

• Odilia, Saint

  http://www.newadvent.org/cathen/11207b.htm
  Patroness of Alsace, d. 720, founded the convent of Hohenburg.

• Odilo, Saint

  http://www.newadvent.org/cathen/11207c.htm
  Abbot of Cluny. He died in 1048.

• Odin, John Mary

  http://www.newadvent.org/cathen/11208a.htm
  (Catholic Encyclopedia)

• Odington, Walter

  http://www.newadvent.org/cathen/11208b.htm
  (Catholic Encyclopedia)

• Odo of Cambrai, Blessed

  http://www.newadvent.org/cathen/11211a.htm
  Benedictine abbot, bishop of Cambrai, exiled for political reasons, d. 1113.

• Odo of Canterbury

  http://www.newadvent.org/cathen/11211b.htm
  (Catholic Encyclopedia)

• Odo of Cheriton

  http://www.newadvent.org/cathen/11212a.htm
  (Catholic Encyclopedia)

• Odo of Glanfeuil

  http://www.newadvent.org/cathen/11212b.htm
  (Catholic Encyclopedia)

• Odo, Saint

  http://www.newadvent.org/cathen/11209a.htm
  Second abbot of Cluny, died 942.

• Odo, Saint

  http://www.newadvent.org/cathen/11209b.htm
  Benedictine monk, Archbishop of Canterbury, died in 959.

• Oecolampadius, John

  http://www.newadvent.org/cathen/11213a.htm
  (Catholic Encyclopedia)

• Oeconomus, Episcopal

  http://www.newadvent.org/cathen/11214a.htm
  (Catholic Encyclopedia)

• Oecumenius

  http://www.newadvent.org/cathen/11214b.htm
  (Catholic Encyclopedia)

• Oertel, John James Maximilian

  http://www.newadvent.org/cathen/11215a.htm
  (Catholic Encyclopedia)

• Oettingen

  http://www.newadvent.org/cathen/11215b.htm
  (Catholic Encyclopedia)

• Offa

  http://www.newadvent.org/cathen/11215c.htm
  (Catholic Encyclopedia)

• Offerings

  http://www.newadvent.org/cathen/11215d.htm
  (Catholic Encyclopedia)

• Offertory

  http://www.newadvent.org/cathen/11217a.htm
  (Catholic Encyclopedia)

• Office of the Dead

  http://www.newadvent.org/cathen/11220a.htm
  Historical article on a special set of prayers for the deceased.

• Ogdensburg, Diocese of

  http://www.newadvent.org/cathen/11222a.htm
  (Catholic Encyclopedia)

• Oggione, Marco D'

  http://www.newadvent.org/cathen/11223a.htm
  (Catholic Encyclopedia)

• Ogliastra

  http://www.newadvent.org/cathen/11223c.htm
  (Catholic Encyclopedia)

• Ohio

  http://www.newadvent.org/cathen/11225d.htm
  (Catholic Encyclopedia)

• Ohler, Aloys Karl

  http://www.newadvent.org/cathen/11228a.htm
  (Catholic Encyclopedia)

• Oil of Saints

  http://www.newadvent.org/cathen/11228d.htm
  (Catholic Encyclopedia)

• Ointment in Scripture

  http://www.newadvent.org/cathen/11229a.htm
  (Catholic Encyclopedia)

• Ojeda, Alonso de

  http://www.newadvent.org/cathen/11230a.htm
  (Catholic Encyclopedia)

• Okeghem, Jean d'

  http://www.newadvent.org/cathen/11230b.htm
  (Catholic Encyclopedia)

• Oklahoma

  http://www.newadvent.org/cathen/11230c.htm
  (Catholic Encyclopedia)

• Olaf Haraldson, Saint

  http://www.newadvent.org/cathen/11234a.htm
  Martyr and King of Norway, d. 1030.

• Olah, Nicolaus

  http://www.newadvent.org/cathen/11234b.htm
  (Catholic Encyclopedia)

• Olba

  http://www.newadvent.org/cathen/11235a.htm
  (Catholic Encyclopedia)

• Old Catholics

  http://www.newadvent.org/cathen/11235b.htm
  (Catholic Encyclopedia)

• Old Chapter, The

  http://www.newadvent.org/cathen/11236a.htm
  (Catholic Encyclopedia)

• Old Hall (St. Edmund's College)

  http://www.newadvent.org/cathen/11239a.htm
  (Catholic Encyclopedia)

• Oldenburg

  http://www.newadvent.org/cathen/11237b.htm
  (Catholic Encyclopedia)

• Oldham, Hugh

  http://www.newadvent.org/cathen/11239b.htm
  (Catholic Encyclopedia)

• Oldoini, Augustino

  http://www.newadvent.org/cathen/11239c.htm
  (Catholic Encyclopedia)

• Olenus

  http://www.newadvent.org/cathen/11240b.htm
  (Catholic Encyclopedia)

• Olesnicki, Zbigniew

  http://www.newadvent.org/cathen/11240c.htm
  (Catholic Encyclopedia)

• Olier, Jean-Jacques

  http://www.newadvent.org/cathen/11240d.htm
  (Catholic Encyclopedia)

• Olinda

  http://www.newadvent.org/cathen/11242a.htm
  (Catholic Encyclopedia)

• Oliva

  http://www.newadvent.org/cathen/11242b.htm
  (Catholic Encyclopedia)

• Oliva, Gian Paolo

  http://www.newadvent.org/cathen/11243a.htm
  (Catholic Encyclopedia)

• Olivaint, Pierre

  http://www.newadvent.org/cathen/11243b.htm
  (Catholic Encyclopedia)

• Oliver Plunket, Saint

  http://www.newadvent.org/cathen/12169b.htm
  Biographical article on the professor of theology, Archbishop of Armagh and Primate of All Ireland, martyred in 1681.

• Oliver, George

  http://www.newadvent.org/cathen/11244a.htm
  (Catholic Encyclopedia)

• Olivet, Mount

  http://www.newadvent.org/cathen/11244b.htm
  (Catholic Encyclopedia)

• Olivetans

  http://www.newadvent.org/cathen/11244c.htm
  (Catholic Encyclopedia)

• Olivi, Pierre Jean

  http://www.newadvent.org/cathen/11245a.htm
  (Catholic Encyclopedia)

• Olivier de la Marche

  http://www.newadvent.org/cathen/11246a.htm
  (Catholic Encyclopedia)

• Ollé-Laprune, Léon

  http://www.newadvent.org/cathen/11246b.htm
  (Catholic Encyclopedia)

• Olmütz

  http://www.newadvent.org/cathen/11247a.htm
  (Catholic Encyclopedia)

• Olympias, Saint

  http://www.newadvent.org/cathen/11248b.htm
  Widow, deaconess, renowned for her almsgiving, and a staunch supporter of St. John Chrysostom.

• Olympus

  http://www.newadvent.org/cathen/11249a.htm
  (Catholic Encyclopedia)

• Omaha, Diocese of

  http://www.newadvent.org/cathen/11249b.htm
  (Catholic Encyclopedia)

• Ombus

  http://www.newadvent.org/cathen/11250a.htm
  (Catholic Encyclopedia)

• Omer, Saint

  http://www.newadvent.org/cathen/11251a.htm
  Swiss-born bishop of Terouenne in Belgic Gaul, founder of a monastery. He died in about 670.

• Omission

  http://www.newadvent.org/cathen/11251b.htm
  (Catholic Encyclopedia)

• Omnipotence

  http://www.newadvent.org/cathen/11251c.htm
  (Catholic Encyclopedia)

• Onias

  http://www.newadvent.org/cathen/11253b.htm
  (Catholic Encyclopedia)

• Ontario

  http://www.newadvent.org/cathen/11254a.htm
  (Catholic Encyclopedia)

• Ontologism

  http://www.newadvent.org/cathen/11257a.htm
  (Catholic Encyclopedia)

• Ontology

  http://www.newadvent.org/cathen/11258a.htm
  (Catholic Encyclopedia)

• Oostacker, Shrine of

  http://www.newadvent.org/cathen/11259a.htm
  (Catholic Encyclopedia)

• Ophir

  http://www.newadvent.org/cathen/11259b.htm
  (Catholic Encyclopedia)

• Oporto

  http://www.newadvent.org/cathen/11260a.htm
  (Catholic Encyclopedia)

• Oppenordt, Gilles-Marie

  http://www.newadvent.org/cathen/11261a.htm
  (Catholic Encyclopedia)

• Oppido Mamertina

  http://www.newadvent.org/cathen/11262a.htm
  (Catholic Encyclopedia)

• Optatus, Saint

  http://www.newadvent.org/cathen/11262b.htm
  Fairly long essay on the life and writings of this bishop, who argued against the Donatists. He died in about 387.

• Optimism

  http://www.newadvent.org/cathen/11263a.htm
  (Catholic Encyclopedia)

• Option, Right of

  http://www.newadvent.org/cathen/11264a.htm
  (Catholic Encyclopedia)

• Oracle

  http://www.newadvent.org/cathen/11264c.htm
  (Catholic Encyclopedia)

• Oran

  http://www.newadvent.org/cathen/11266a.htm
  (Catholic Encyclopedia)

• Orange Free State

  http://www.newadvent.org/cathen/11267a.htm
  (Catholic Encyclopedia)

• Orange River, Vicariate Apostolic of

  http://www.newadvent.org/cathen/11268a.htm
  (Catholic Encyclopedia)

• Orange, Councils of

  http://www.newadvent.org/cathen/11266b.htm
  (Catholic Encyclopedia)

• Orans

  http://www.newadvent.org/cathen/11269a.htm
  (Catholic Encyclopedia)

• Orate Fratres

  http://www.newadvent.org/cathen/11269b.htm
  (Catholic Encyclopedia)

• Oratorio

  http://www.newadvent.org/cathen/11270a.htm
  (Catholic Encyclopedia)

• Oratory

  http://www.newadvent.org/cathen/11271a.htm
  (Catholic Encyclopedia)

• Oratory of Saint Philip Neri, The

  http://www.newadvent.org/cathen/11272a.htm
  (Catholic Encyclopedia)

• Oratory, French Congregation of the

  http://www.newadvent.org/cathen/11274a.htm
  (Catholic Encyclopedia)

• Orbellis, Nicolas d'

  http://www.newadvent.org/cathen/11275a.htm
  (Catholic Encyclopedia)

• Orcagna

  http://www.newadvent.org/cathen/11275b.htm
  (Catholic Encyclopedia)

• Orcistus

  http://www.newadvent.org/cathen/11276a.htm
  (Catholic Encyclopedia)

• Ordeals

  http://www.newadvent.org/cathen/11276b.htm
  (Catholic Encyclopedia)

• Ordericus Vitalis

  http://www.newadvent.org/cathen/11278a.htm
  (Catholic Encyclopedia)

• Orders, Holy

  http://www.newadvent.org/cathen/11279a.htm
  (Catholic Encyclopedia)

• Ordinariate

  http://www.newadvent.org/cathen/11284a.htm
  (Catholic Encyclopedia)

• Ordinary

  http://www.newadvent.org/cathen/11284b.htm
  (Catholic Encyclopedia)

• Ordines Romani

  http://www.newadvent.org/cathen/11284c.htm
  (Catholic Encyclopedia)

• Oregon

  http://www.newadvent.org/cathen/11288a.htm
  (Catholic Encyclopedia)

• Oregon City

  http://www.newadvent.org/cathen/11293a.htm
  (Catholic Encyclopedia)

• Oremus

  http://www.newadvent.org/cathen/11295a.htm
  (Catholic Encyclopedia)

• Orense, Diocese of

  http://www.newadvent.org/cathen/11295b.htm
  (Catholic Encyclopedia)

• Oresme, Nicole

  http://www.newadvent.org/cathen/11296a.htm
  Article by Pierre Duhem on this medieval scientific thinker.

• Organ

  http://www.newadvent.org/cathen/11297a.htm
  (Catholic Encyclopedia)

• Oria

  http://www.newadvent.org/cathen/11302a.htm
  (Catholic Encyclopedia)

• Oriani, Barnaba

  http://www.newadvent.org/cathen/11302b.htm
  (Catholic Encyclopedia)

• Oriental Study and Research

  http://www.newadvent.org/cathen/11302c.htm
  (Catholic Encyclopedia)

• Orientation of Churches

  http://www.newadvent.org/cathen/11305a.htm
  (Catholic Encyclopedia)

• Orientius

  http://www.newadvent.org/cathen/11305b.htm
  (Catholic Encyclopedia)

• Oriflamme

  http://www.newadvent.org/cathen/11306a.htm
  (Catholic Encyclopedia)

• Origen and Origenism

  http://www.newadvent.org/cathen/11306b.htm
  Provides a biography and review of his works, as well as commentary on posthumous influences and the Origenistic Crises.

• Original Sin

  http://www.newadvent.org/cathen/11312a.htm
  (Catholic Encyclopedia)

• Orihuela

  http://www.newadvent.org/cathen/11315a.htm
  (Catholic Encyclopedia)

• Oristano

  http://www.newadvent.org/cathen/11316b.htm
  (Catholic Encyclopedia)

• Orkneys

  http://www.newadvent.org/cathen/11316c.htm
  (Catholic Encyclopedia)

• Orlandini, Niccolò

  http://www.newadvent.org/cathen/11317a.htm
  (Catholic Encyclopedia)

• Orléans, Councils of

  http://www.newadvent.org/cathen/11318a.htm
  (Catholic Encyclopedia)

• Orléans, Diocese of

  http://www.newadvent.org/cathen/11318b.htm
  (Catholic Encyclopedia)

• Orley, Barent Van

  http://www.newadvent.org/cathen/11320a.htm
  (Catholic Encyclopedia)

• Orme, Philibert de l'

  http://www.newadvent.org/cathen/11321a.htm
  (Catholic Encyclopedia)

• Oropus

  http://www.newadvent.org/cathen/11321b.htm
  (Catholic Encyclopedia)

• Orosius, Paulus

  http://www.newadvent.org/cathen/11322a.htm
  (Catholic Encyclopedia)

• Orphans and Orphanages

  http://www.newadvent.org/cathen/11322b.htm
  (Catholic Encyclopedia)

• Orsi, Giuseppe Agostino

  http://www.newadvent.org/cathen/11325a.htm
  (Catholic Encyclopedia)

• Orsini

  http://www.newadvent.org/cathen/11325b.htm
  (Catholic Encyclopedia)

• Orsisius

  http://www.newadvent.org/cathen/11328a.htm
  (Catholic Encyclopedia)

• Ortelius, Abraham

  http://www.newadvent.org/cathen/11328b.htm
  (Catholic Encyclopedia)

• Orthodox Church

  http://www.newadvent.org/cathen/11329a.htm
  (Catholic Encyclopedia)

• Orthodoxy

  http://www.newadvent.org/cathen/11330a.htm
  (Catholic Encyclopedia)

• Orthodoxy, Feast of

  http://www.newadvent.org/cathen/11330b.htm
  (Catholic Encyclopedia)

• Orthosias

  http://www.newadvent.org/cathen/11330c.htm
  (Catholic Encyclopedia)

• Ortolano Ferrarese

  http://www.newadvent.org/cathen/11331a.htm
  (Catholic Encyclopedia)

• Orval

  http://www.newadvent.org/cathen/11331b.htm
  (Catholic Encyclopedia)

• Orvieto

  http://www.newadvent.org/cathen/11331c.htm
  (Catholic Encyclopedia)

• Ory, Matthieu

  http://www.newadvent.org/cathen/11333a.htm
  (Catholic Encyclopedia)

• Osaka

  http://www.newadvent.org/cathen/11333b.htm
  (Catholic Encyclopedia)

• Osbald

  http://www.newadvent.org/cathen/11334b.htm
  (Catholic Encyclopedia)

• Osbern

  http://www.newadvent.org/cathen/11335b.htm
  (Catholic Encyclopedia)

• Oscott (St. Mary's College)

  http://www.newadvent.org/cathen/11335c.htm
  (Catholic Encyclopedia)

• Osee

  http://www.newadvent.org/cathen/11337a.htm
  The prophet and his book.

• Osimo

  http://www.newadvent.org/cathen/11338a.htm
  (Catholic Encyclopedia)

• Oslo, Ancient See of

  http://www.newadvent.org/cathen/16065a.htm
  (Catholic Encyclopedia)

• Osma, Diocese of

  http://www.newadvent.org/cathen/11339a.htm
  (Catholic Encyclopedia)

• Osmund, Saint

  http://www.newadvent.org/cathen/11340a.htm
  A Norman by birth, Osmund became bishop of Salisbury, and died in 1099.

• Osnabrück, Diocese of

  http://www.newadvent.org/cathen/11341a.htm
  (Catholic Encyclopedia)

• Ossat, Arnaud d'

  http://www.newadvent.org/cathen/11342a.htm
  (Catholic Encyclopedia)

• Ossory, Diocese of

  http://www.newadvent.org/cathen/11342b.htm
  (Catholic Encyclopedia)

• Ostensorium (Monstrance)

  http://www.newadvent.org/cathen/11344a.htm
  (Catholic Encyclopedia)

• Ostia and Velletri

  http://www.newadvent.org/cathen/11346a.htm
  (Catholic Encyclopedia)

• Ostiensis

  http://www.newadvent.org/cathen/11347a.htm
  (Catholic Encyclopedia)

• Ostracine

  http://www.newadvent.org/cathen/11347b.htm
  (Catholic Encyclopedia)

• Ostraka, Christian

  http://www.newadvent.org/cathen/11347c.htm
  (Catholic Encyclopedia)

• Ostrogoths

  http://www.newadvent.org/cathen/11347d.htm
  (Catholic Encyclopedia)

• Oswald, Saint

  http://www.newadvent.org/cathen/11348c.htm
  King of Northumbria and martyr, d. 642.

• Oswald, Saint

  http://www.newadvent.org/cathen/11348b.htm
  Archbishop of York, d. 992 while washing the feet of the poor, as was his daily custom during Lent.

• Oswin, Saint

  http://www.newadvent.org/cathen/11349a.htm
  Biography of the king and martyr, who was murdered in 651.

• Otfried of Weissenburg

  http://www.newadvent.org/cathen/11350a.htm
  (Catholic Encyclopedia)

• Othlo

  http://www.newadvent.org/cathen/11350b.htm
  (Catholic Encyclopedia)

• Othmar, Saint

  http://www.newadvent.org/cathen/11351a.htm
  First abbot of St. Gall. He died in prison in 759.

• Otho, Marcus Salvius

  http://www.newadvent.org/cathen/11351b.htm
  Details on the reign of Roman Emperor.

• Otranto

  http://www.newadvent.org/cathen/11351c.htm
  (Catholic Encyclopedia)

• Ottawa, Archdiocese of

  http://www.newadvent.org/cathen/11352a.htm
  (Catholic Encyclopedia)

• Ottawa, University of

  http://www.newadvent.org/cathen/11352b.htm
  (Catholic Encyclopedia)

• Otto I (the Great)

  http://www.newadvent.org/cathen/11354a.htm
  (Catholic Encyclopedia)

• Otto II

  http://www.newadvent.org/cathen/11355a.htm
  (Catholic Encyclopedia)

• Otto III

  http://www.newadvent.org/cathen/11356a.htm
  (Catholic Encyclopedia)

• Otto IV

  http://www.newadvent.org/cathen/11357a.htm
  (Catholic Encyclopedia)

• Otto of Freising

  http://www.newadvent.org/cathen/11358b.htm
  (Catholic Encyclopedia)

• Otto of Passau

  http://www.newadvent.org/cathen/11359a.htm
  (Catholic Encyclopedia)

• Otto of St. Blasien

  http://www.newadvent.org/cathen/11360a.htm
  (Catholic Encyclopedia)

• Otto, Saint

  http://www.newadvent.org/cathen/11353a.htm
  Swabian courtier, was named bishop of Bamberg in 1102, and founded over twenty monasteries.

• Ottobeuren

  http://www.newadvent.org/cathen/11358a.htm
  (Catholic Encyclopedia)

• Ouen, Saint

  http://www.newadvent.org/cathen/11360b.htm
  Seventh-century Archbishop of Rouen, founder of several monasteries, devoted to theological studies, friend of St. Eloi.

• Our Lady of Good Counsel, Feast of

  http://www.newadvent.org/cathen/11361a.htm
  (Catholic Encyclopedia)

• Our Lady of the Fields, Brothers of

  http://www.newadvent.org/cathen/11361b.htm
  (Catholic Encyclopedia)

• Our Lady of the Snow

  http://www.newadvent.org/cathen/11361c.htm
  (Catholic Encyclopedia)

• Our Lady, Help of Christians, Feast of

  http://www.newadvent.org/cathen/11360c.htm
  (Catholic Encyclopedia)

• Overbeck, Friedrich

  http://www.newadvent.org/cathen/11362a.htm
  (Catholic Encyclopedia)

• Overberg, Bernhard Heinrich

  http://www.newadvent.org/cathen/11362b.htm
  (Catholic Encyclopedia)

• Oviedo, Diocese of

  http://www.newadvent.org/cathen/11363a.htm
  (Catholic Encyclopedia)

• Oxenford, John

  http://www.newadvent.org/cathen/11364b.htm
  (Catholic Encyclopedia)

• Oxenham, Henry Nutcombe

  http://www.newadvent.org/cathen/11365a.htm
  (Catholic Encyclopedia)

• Oxford

  http://www.newadvent.org/cathen/11365b.htm
  (Catholic Encyclopedia)

• Oxford Movement, The (1833-1845)

  http://www.newadvent.org/cathen/11370a.htm
  Lengthy historical article on the Tractarian Movement includes information on John Henry Newman, as well as on other leading lights of this nineteenth-century Anglo-Catholic campaign, such as John Keble and Hurrell Froude.

• Oxford, University of

  http://www.newadvent.org/cathen/11365c.htm
  (Catholic Encyclopedia)

• Oxyrynchus

  http://www.newadvent.org/cathen/11377a.htm
  (Catholic Encyclopedia)

• Ozanam, Antoine-Frédéric

  http://www.newadvent.org/cathen/11378a.htm
  (Catholic Encyclopedia)

• Ozanam, Jacques

  http://www.newadvent.org/cathen/11378b.htm
  (Catholic Encyclopedia)

• Ozias

  http://www.newadvent.org/cathen/11379a.htm
  (Catholic Encyclopedia)

 

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