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The Catholic Encyclopedia: O

• 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 St. Francis de Sales
• Oblatæ Oblates Oblati
• Obligation
• Tighernach O'Braein
• Obregonians
• Obreption
• Terence Albert O'Brien
• David O'Bruadair
• Vatican Observatory
• Edmund Bailey O'Callaghan
• Torlogh O'Carolan
• William of Occam
• Occasionalism
• Occasions of Sin
• Thomas Occleve
• Occultism Occult Art
• Occurrence
• Vicariate Apostolic of Central Oceania
• William of Ockham
• Daniel O'Connell
• Charles O'Conor
• Charles O'Conor
• Octave
• Octavarium Romanum
• Gelasius O'Cullenan
• Eugene O'Curry
• Daniel O'Daly
• Donogh Mór O'Daly
• Ancient See of Odense Odense
• Carlo Odescalchi
• O Deus Ego Amo Te
• Cornelius O'Devany
• Saint Odilia
• Saint Odilo
• John Mary Odin
• Walter Odington
• Saint 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
• John Œcolampadius
• Episcopal Œconomus
• Œcumenius
• John James Maximilian Oertel
• Oettingen
• Offa
• Offerings
• Offertory
• Divine Office
• Office of the Dead
• Maurice O'Fihely
• O Filii et Filiæ
• Diocese of Ogdensburg
• Marco D' Oggione
• John Venerable Ogilvie
• Ogliastra
• Eugene O'Growney
• John O'Hagan
• Thomas O'Hagan
• John O'Hanlon
• Theodore O'Hara
• Patrick O'Hely
• Thomas O'Herlahy
• Ambrose and Bernard O'Higgins
• Ohio
• Aloys Karl Ohler
• Dermond O'Hurley
• Maelbrighte O'Hussey
• Oil of Saints
• Holy Oils
• Ointment in Scripture
• Alonso de Ojeda
• Jean d' Okeghem
• Oklahoma
• Saint Olaf Haraldson
• Nicolaus Oláh
• Olba
• Old Catholics
• The Old Chapter
• Ven. Edward Oldcorne
• Oldenburg
• Old Hall (St. Edmund's College)
• Hugh Oldham
• Augustino Oldoini
• Old Testament
• Canon of the Old Testament
• 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
• Léon Ollé-Laprune
• Olmütz
• Michael O'Loghlen
• Saint Olympias
• Olympus
• Omaha
• Ombus
• Kathleen O'Meara
• Saint Omer
• Omission
• Omnipotence
• Hugh O'Neill
• Owen Roe O'Neill
• Onias
• Ontario
• Ontologism
• Ontology
• Shrine of Oostacker
• Opening Prayer (in the Mass)
• Ophir
• Oporto
• Gilles-Marie Oppenordt
• Oppido Mamertina
• Saint Optatus
• Optimism
• Right of Option
• Malachias O'Queely
• Oracle
• Oran
• Councils of Orange
• Orange Free State
• Orange River
• 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
• The Military Orders
• Ordinariate
• Ordinary
• Ordinos 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
• The Organic Articles
• Oria
• Barnaba Oriani
• Oriental Study and Research
• Orientation of Churches
• Orientius
• Oriflamme
• Origen and Origenism
• Original Sin
• Orihuela
• Saint Joseph Oriol
• Oristano
• Orkneys
• Niccolò Orlandini
• Orléans
• Councils of Orléans
• Barent Van Orley
• Philibert de l' Orme
• Oropus
• Patrick Henry O'Rorke
• Paulus Orosius
• Orphans and Orphanages
• Giuseppe Agostino Orsi
• Orsini
• Orsisius
• Abraham Ortelius
• Orthodox Church
• Orthodoxy
• Feast of Orthodoxy
• Orthosias
• Ortolano Ferrarese
• Orval
• Orvieto
• Matthieu Ory
• Osaka
• O Salutaris Hostia
• Osbald
• Edward Venerable Osbaldeston
• Osbern
• Oscott (St. Mary's College)
• Osee
• Osimo
• Ancient See of Oslo
• Osma
• Saint Osmund
• Osnabrück
• Arnaud d' Ossat
• Diocese of Ossory
• Ostensorium
• Ostia and Velletri
• Ostiensis
• Ostracine
• Christian Ostraka
• Ostrogoths
• Philip O'Sullivan Beare
• Saint Oswald
• Saint Oswald
• Saint Oswin
• Otfried of Weissenburg
• Othlo
• Saint Othmar
• Marcus Salvius Otho
• Saint Lawrence O'Toole
• Otranto
• Archdiocese of Ottawa
• University of Ottawa
• Saint Otto
• the Great Otto I (Otto I)
• Otto II
• Otto III
• Otto IV
• Ottobeuren
• Otto of Freising
• Otto of Passau
• Otto of St. Blasien
• Saint Ouen
• The Our Father
• Help of Christians Feast of Our Lady
• Our Lady of Charity of the Good Shepherd
• Feast of Our Lady of Good Counsel
• Brothers of Our Lady of the Fields
• Our Lady of the Snow
• Our Lady of Perpetual Help
• Our Lady of Perpetual Succour
• Friedrich Overbeck
• Bernhard Heinrich Overberg
• Theories of Overpopulation
• Oviedo
• Saint Owen
• Saint Nicholas Owen
• John Oxenford
• Henry Nutcombe Oxenham
• Oxford
• University of Oxford
• The Oxford Movement
• Oxyrynchus
• Antoine-Frédéric Ozanam
• Jacques Ozanam
• Ozias