Our Authors
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- 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
- Oliver O'Donovan
- Herbert O'Driscoll
- William O'Flaherty
- David L. O'Hara
- Martin O'Kane
- Aaron T. O'Kelley
- Joseph S. O'Leary
- Thomas O'Loughlin
- Mark O'Malley
- Timothy P. O'Malley
- Carey Scott O'Neal Jr.
- Michael D. O'Neil
- Robyn O'Neil
- Daniel W. O'Neill
- Jerry R. O'Neill
- Shaun O'Neill
- William O'Neill
- Cyril O'Regan
- Vincent O'Sullivan
- Sung-Duk Oak
- Edward T. Oakes S.J.
- John S. Oakes
- Karl L. Oakes
- Kenneth Oakes
- Peter Oakes
- Douglas E. Oakman
- Tom Joel Obengo
- Paul Scott Oberman
- Teresa Obolevitch
- Peter Ochs
- Harold John Ockenga
- Luther Jeremiah Oconer
- John Segun Odeyemi
- Andrew Odle
- Mercy A. Oduyoye
- Modupe Oduyoye
- Fritz Oehlschlaeger
- Joel Oesch
- W. O. E. Oesterley
- Bernhard Oestreich
- Bishop of Argyll and the Isles
- Cyril of Jerusalem
- William of Malmesbury
- David Wesley Ofumbi
- Joseph Ogbonnaya
- Schubert M. Ogden
- George Ogg
- E. Hammond Oglesby
- Billy T. Ogletree
- Abraham Sung-Ho Oh
- Dennis Oh
- Priscilla Sun Kyung Oh
- Robert Oh
- Todd Ohara