Olau - Padu
- Our Lady of the Fields, Brothers of
- Our Lady of the Snow
- Our Lady, Help of Christians, Feast of
- Our Lord
- Overbeck, Friedrich
- Overberg, Bernhard Heinrich
- Overpopulation Theories
- Overpopulation, Theories of
- Oviedo
- Owen Roe O'Neill
- Owen, Saint
- Owen, Saint Nicholas
- Oxenford, John
- Oxenham, Henry Nutcombe
- Oxford
- Oxford Movement, The
- Oxford, University of
- Oxon.
- Oxyrynchus
- Ozanam, Antoine-Frédéric
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