Olau - Padu
- Onno Klopp
- Onofrio Panvinio
- Ontario
- Ontologism
- Ontology
- Oostacker, Shrine of
- OP.
- Op. Cit.
- Opening Prayer (in the Mass)
- Ophir
- Oporto
- Oppenordt, Gilles-Marie
- Oppido Mamertina
- Optatus, Saint
- Optimism
- Option, Right of
- Or.
- Oracle
- Oran
- Orange Free State
- Orange River
- Orange River, South Africa
- Orange, Councils of
- Orans
- Orat.
- Orate Fratres
- Oratorio
- Oratory
- Oratory of Saint Philip Neri, The
- Oratory, French Congregation of the
- Orbellis, Nicolas d'
- Orcagna
- Orcistus
- Ord Fratr. Praed.
- Ord.
- Ord. Praem.
- Ordeals
- Order and Abbey of Fontevrault
- Order of Aviz
- Order of Friars Minor
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