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
- Patricia O'Donnell
- John O'Donohue
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- Herbert O'Driscoll
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- Annie O'Neil
- Michael D. O'Neil
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- K. M. O'Neill
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- William O'Neill
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- Bart O'Reilly
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- Sung-Duk Oak
- Edward T. Oakes S.J.
- Eric Oakes
- John S. Oakes
- Karl L. Oakes
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- Modupe Oduyoye
- Fritz Oehlschlaeger
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- Bernhard Oestreich
- Bishop of Argyll and the Isles
- Adrevald of Fleury
- Cyril of Jerusalem
- William of Malmesbury