Olau = - Padu =
- Orihuela
- Oriol, Saint Joseph
- Oristano
- Orkneys
- Orlandini, Niccolò
- Orlando de Lassus
- Orléans
- Orléans, Councils of
- Orley, Barent Van
- Orme, Philibert de l'
- Oropus
- Orosius, Paulus
- Orphans and Orphanages
- Orsi, Giuseppe Agostino
- Orsini
- Orsisius
- Ortelius, Abraham
- Orthodox Church
- Orthodoxy
- Orthodoxy, Feast of
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