Olau - Padu
- Osorio Francisco Meneses
- Ossat, Arnaud d'
- Ossory, Diocese of
- Ostensorium
- Ostia and Velletri
- Ostiensis
- Ostracine
- Ostraka, Christian
- Ostrogoths
- Oswald, Saint
- Oswin, Saint
- Otfried of Weissenburg
- Othlo
- Othmar, Saint
- Otho, Marcus Salvius
- Otranto
- Ottawa, Archdiocese of
- Ottawa, University of
- Ottmar Luscinius
- Otto I (The Great)
- Otto I, the Great
- Otto II
- Otto III
- Otto IV
- Otto of Blasien
- Otto of Freising
- Otto of Passau
- Otto of St. Blasien
- Otto Truchsess von Waldburg
- Otto, Saint
- Ottobeuren
- Ouen, Saint
- Our Father, The
- Our Lady of Ambronay
- Our Lady of Arcachon
- Our Lady of Charity of the Good Shepherd
- Our Lady of Good Counsel, Feast of
- Our Lady of Perpetual Help
- Our Lady of Perpetual Succour
- Our Lady of Perpetual Succour (Our Lady of Perpetual Help)
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