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O Antiphons O Deus Ego Amo Te O Filii et Filiæ O Salutaris Hostia Tighernach O'Braein Terence Albert O'Brien David O'Bruadair Edmund Bailey O'Callaghan Torlogh O'Carolan Daniel O'Connell Charles O'Conor Charles O'Conor Gelasius O'Cullenan Eugene O'Curry Daniel O'Daly Donogh Mór O'Daly Cornelius O'Devany Edmund O'Donnell John O'Donovan John O'Dugan Joseph O'Dwyer Maurice O'Fihely Eugene O'Growney John O'Hagan Thomas O'Hagan John O'Hanlon Theodore O'Hara Patrick O'Hely Thomas O'Herlahy O'Higgins Dermond O'Hurley Maelbrighte O'Hussey Arthur O'Leary Michael O'Loghlen Kathleen O'Meara Hugh O'Neill Owen Roe O'Neill Malachias O'Queely Bernard O'Reilly Edmund O'Reilly Edmund O'Reilly Hugh O'Reilly John Boyle O'Reilly Myles William Patrick O'Reilly Patrick Henry O'Rorke Philip O'Sullivan Beare St. Lawrence O'Toole Frederick Oakeley 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 Obregonians Obreption Vatican Observatory William of Ockham Occasionalism Occasions of Sin Thomas Occleve Occult Art, Occultism Occurrence Vicariate Apostolic of Central Oceania William of Ockham Octavarium Romanum Octave Ancient See of Odense in Denmark Carlo Odescalchi St. Odilia St. Odilo John Mary Odin Walter Odington Bl. Odo of Cambrai Odo of Canterbury Odo of Cheriton Odo of Glanfeuil St. Odo St. Odo John James Maximilian Oertel Oettingen Offa Offerings Offertory Office of the Dead Divine Office Diocese of Ogdensburg Marco D'Oggione Ven. John Ogilvie Ogliastra Ohio Aloys Karl Ohler Oil of Saints Holy Oils Ointment in Scripture Alonso de Ojeda Jean d'Okeghem Oklahoma Nicolaus Oláh St. Olaf Haraldson Olba Old Catholics The Old Chapter Old Hall (St. Edmund's College) The Old Testament Canon of the Old Testament Ven. Edward Oldcorne Oldenburg Hugh Oldham Augustino Oldoini 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 St. Olympias Olympus Diocese of Omaha Ombus St. Omer
Omission Omnipotence Onias Ontario Ontologism Ontology Shrine of Oostacker Collect Ophir Oporto Gilles-Marie Oppenordt Oppido Mamertina St. Optatus Optimism Right of Option Oracle Oran Orange Free State Vicariate Apostolic of Orange River Councils of Orange 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 Ordines Romani Oregon Archdiocese of Oregon City Oremus Diocese of Orense Nicole Oresme Organ The Organic Articles Diocese of Oria Barnaba Oriani Oriental Study and Research Orientation of Churches Orientius Oriflamme Origen and Origenism Original Sin Orihuela St. Joseph Oriol Oristano Orkneys Diocese of Orléans Councils of Orléans Niccolò Orlandini Barent Van Orley Philibert de l'Orme Oropus 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 Osbald Ven. Edward Osbaldeston Osbern Oscott (St. Mary's College) Osee Osimo Ancient See of Oslo in Norway Diocese of Osma St. Osmund Diocese of Osnabrück Arnaud d'Ossat Diocese of Ossory Ostensorium (Monstrance) Ostia and Velletri Ostiensis Ostracine Christian Ostraka Ostrogoths St. Oswald St. Oswald St. Oswin Otfried of Weissenburg Othlo St. Othmar Marcus Salvius Otho Otranto Ottawa University of Ottawa Otto I, the Great Otto II Otto III Otto IV Otto of Freising Otto of Passau Otto of St. Blasien St. Otto Ottobeuren St. Ouen The Lord's Prayer Our Lady of Charity of the Good Shepherd Feast of Our Lady of Good Counsel Our Lady of Perpetual Succour Our Lady of Perpetual Succour Brothers of Our Lady of the Fields Our Lady of the Snow Feast of Our Lady, Help of Christians Friedrich Overbeck Bernhard Heinrich Overberg Theories of Population Diocese of Oviedo St. Ouen Nicholas Owen John Oxenford Henry Nutcombe Oxenham Oxford The Oxford Movement (1833-1845) University of Oxford Oxyrynchus Antoine-Frédéric Ozanam Jacques Ozanam Ozias

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The Catholic Encyclopedia is the most comprehensive resource on Catholic teaching, history, and information ever gathered in all of human history. This easy-to-search online version was originally printed in fifteen hardcopy volumes.

Catholic Encyclopedia

Designed to present its readers with the full body of Catholic teaching, the Encyclopedia contains not only precise statements of what the Church has defined, but also an impartial record of different views of acknowledged authority on all disputed questions, national, political or factional. In the determination of the truth the most recent and acknowledged scientific methods are employed, and the results of the latest research in theology, philosophy, history, apologetics, archaeology, and other sciences are given careful consideration.

No one who is interested in human history, past and present, can ignore the Catholic Church, either as an institution which has been the central figure in the civilized world for nearly two thousand years, decisively affecting its destinies, religious, literary, scientific, social and political, or as an existing power whose influence and activity extend to every part of the globe. In the past century the Church has grown both extensively and intensively among English-speaking peoples. Their living interests demand that they should have the means of informing themselves about this vast institution, which, whether they are Catholics or not, affects their fortunes and their destiny.

Copyright © Catholic Encyclopedia. Robert Appleton Company New York, NY. Volume 1: 1907; Volume 2: 1907; Volume 3: 1908; Volume 4: 1908; Volume 5: 1909; Volume 6: 1909; Volume 7: 1910; Volume 8: 1910; Volume 9: 1910; Volume 10: 1911; Volume 11: - 1911; Volume 12: - 1911; Volume 13: - 1912; Volume 14: 1912; Volume 15: 1912

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