Frederick Oakeley

 O Antiphons

 Oates's Plot

 Oaths

 English Post-Reformation Oaths

 Archdiocese of 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

 Tighernach O'Braein

 Obregonians

 Obreption

 Terence Albert O'Brien

 David O'Bruadair

 Edmund Bailey O'Callaghan

 Torlogh O'Carolan

 Occasionalism

 Occasions of Sin

 Thomas Occleve

 Occult Art, Occultism

 Occurrence

 Vicariate Apostolic of Central Oceania

 Daniel O'Connell

 Charles O'Conor (1)

 Charles O'Conor (2)

 Octavarium Romanum

 Octave

 Gelasius O'Cullenan

 Eugene O'Curry

 Daniel O'Daly

 Donogh Mór O'Daly

 Carlo Odescalchi

 O Deus Ego Amo Te

 Cornelius O'Devany

 St. Odilia

 St. Odilo

 John Mary Odin

 Walter Odington

 St. Odo

 St. Odo (Oda)

 Odo

 Edmund O'Donnell

 John O'Donovan

 Bl. Odo of Cambrai

 Odo of Canterbury

 Odo of Cheriton

 Odo of Glanfeuil

 John O'Dugan

 Joseph O'Dwyer

 Johann Œcolampadius

 Episcopal œconomus

 Œcumenius

 John James Maximilian Oertel

 Oettingen

 Offa

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 Divine Office

 Office of the Dead

 Maurice O'Fihely

 O Filii et Filiæ

 Diocese of Ogdensburg

 Marco D'Oggione

 Ven. John Ogilvie

 Diocese of Ogliastra

 Eugene O'Growney

 John O'Hagan

 Thomas O'Hagan

 John O'Hanlon

 Theodore O'Hara

 Patrick O'Hely

 Thomas O'Herlahy

 Ambrose Bernard O'Higgins

 Ohio

 Aloys Karl Ohler

 Dermod O'Hurley

 Maelbrighte O'Hussey

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 Jean d'Okeghem

 Oklahoma

 St. Olaf Haraldson

 Nicolaus Oláh

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 Ven. Edward Oldcorne

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 Hugh Oldham

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 Jean-Jacques Olier

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 Gian Paolo Oliva

 Pierre Olivaint

 George Oliver

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 Pierre Jean Olivi

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 Léon Ollé-Laprune

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 Hugh O'Neill

 Owen Roe O'Neill

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 Malachias O'Queely

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 Archdiocese of Oregon City

 Bernard O'Reilly

 Edmund O'Reilly (1)

 Edmund O'Reilly (2)

 Hugh O'Reilly

 John Boyle O'Reilly

 Myles William Patrick O'Reilly

 Oremus

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 Nicole Oresme

 Organ

 Diocese of Oria

 Barnaba Oriani

 Oriental Study and Research

 Orientation of Churches

 Orientius

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 Diocese of Orihuela

 St. Joseph Oriol

 Diocese of Oristano

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 Niccolò Orlandini

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 Philibert de l'Orme

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 Patrick Henry O'Rorke

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 Giuseppe Agostino Orsi

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 Abraham Ortelius

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 Diocese of Orvieto

 Matthieu Ory

 Diocese of Osaka

 O Salutaris Hostia

 Osbald

 Ven. Edward Osbaldeston

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 Christian Ostraka

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 Philip O'Sullivan Beare

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 St. Oswald (2)

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 University of Ottawa

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 St. Ouen

 Feast of Our Lady, Help of Christians

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 Brothers of Our Lady of the Fields

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 Friedrich Overbeck

 Bernhard Heinrich Overberg

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 Nicholas Owen

 John Oxenford

 Henry Nutcombe Oxenham

 Oxford

 University of Oxford

 Oxford Movement (1833-1845)

 Oxyrynchus

 Antoine-Frédéric Ozanam

 Jacques Ozanam

 Ozias

Patrick Henry O'Rorke


Soldier, b. in County Cavan, Ireland, 25 March, 1837; killed at the battle of Gettysburg, Penn., U.S.A., July 1863. He was a year old when his parents emigrated to the United States. They settled in Rochester, N.Y., where he attended the public schools, and in 1853 went to work as a marble-cutter. Shortly after he was appointed a cadet in the U.S. Military Academy at West Point, graduating with highest honours in June, 1861. Commissioned a lieutenant in the regular army, he distinguished himself in the Civil War as a staff-officer in the engineer corps, was made colonel of the 140th regiment of New York Volunteers, with which command he participated in the battles of Fredericksburg and Chancellorsville. At Gettysburg while leading his men in defence of Little Round Top, in the very crisis of the battle he caught up the colours, and, mounting a rock to urge on his men, was struck and fell dead. The Comte de Paris in his "Histoire de la guerre civile en Amérique" (VI, iv, 379) says this was one of the most striking and dramatic episodes of the battle. His widow became a Religious of the Sacred Heart and one of the successful educators in their New York convents.

Cullum, Biog. Register of Officers and Graduates of the U.S. Military Academy (Boston, 1891); O'Hanlon, Irish American History of the U.S., II (New York, 1906), 500; Fitzgerald, Ireland and Her People, II (Chicago, 1910); Nat. Cyclopedia Am. Biog., s.v.

THOMAS MEEHAN