Our Authors
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- Travis O'Brian
- J. Randall O'Brien
- John O'Brien
- Kevin J. O'Brien
- Sister Mary Consilia O'Brien
- Niall O'Brien
- Peter T. O'Brien
- Michael O'Carroll
- Gerald O'Collins SJ
- Jake O'Connell
- Matthew J. O'Connell
- Patrick F. O'Connell
- James T. O'Connor
- John Cardinal O'Connor
- Gail R. O'Day
- Eric O'Dell
- Tonna O'Dell
- Angela O'Donnell
- Angela Alaimo O'Donnell
- Douglas Sean O'Donnell
- Eleanor O'Donnell
- Patricia O'Donnell
- John O'Donohue
- Oliver O'Donovan
- Herbert O'Driscoll
- William O'Flaherty
- David L. O'Hara
- Patrick Seamus O'Hara
- Padraic O'Hare
- Martin O'Kane
- Aaron T. O'Kelley
- Joseph S. O'Leary
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- Timothy P. O'Malley
- Carey Scott O'Neal Jr.
- Annie O'Neil
- Michael D. O'Neil
- Robyn O'Neil
- Daniel W. O'Neill
- Jerry R. O'Neill
- K. M. O'Neill
- Krista O'Neill
- Mary Aquin O'Neill RSM
- Shaun O'Neill
- William O'Neill
- Cyril O'Regan
- Bart O'Reilly
- Vincent O'Sullivan
- Sung-Duk Oak
- Edward T. Oakes S.J.
- Eric Oakes
- John S. Oakes
- Karl L. Oakes
- Kenneth Oakes
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- Douglas E. Oakman
- Tom Joel Obengo
- Andrew Oberg
- Paul Scott Oberman
- Teresa Obolevitch
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- Luther Jeremiah Oconer
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- Mercy A. Oduyoye
- Modupe Oduyoye
- Fritz Oehlschlaeger
- Joel Oesch
- W. O. E. Oesterley
- Bernhard Oestreich
- Bishop of Argyll and the Isles
- Adrevald of Fleury