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St. Obdulia St. Obitius St. Oceanus St. Octavian St. Octavious St. Octavius, Solutor, and Adventor St. Oda St. Odhran of Iona St. Odilia Bl. Odilia Baumgarten St. Odilo St. Odilo of Cluny St. Odo St. Odo St. Odo of Beauvais St. Odo of Urgell Bl. Odoric of Pordenone St. Odo the Good St. Odran St. Odrian St. Odulf St. Oduvald St. Oeconomus St. Offa St. Jón Ögmundsson St. Olaf St. Olaf of Norway St. Olaf of Sweden Bl. Oleksa Zaryckyj St. Olga Bl. Olha Bida St. Oliva Bl. Olive St. Oliver St. Oliver Plunkett Bl. Olivia St. Ollegarius St. Olympiades St. Olympias St. Olympius
St. Olympius St. Omer St. Oncho St. Onesimus St. Onesimus St. Onesiphorus St. Onouphrius Bl. Onufry Wasyluk St. Opportuna St. Optatian St. Optatus of Milevis St. Or St. Ordonius St. Orentius St. Orentius St. Orentius and Patientia St. Orestes St. Orestes St. Oriculus and Companions St. Orion St. Orion St. Ormond St. Orsisius St. Orsisius Bl. Osanna of Cattaro St. Osburga St. Osmanna St. Osmanna St. Osmund of Salisbury St. Ostianus St. Oswald St. Osyth St. Othmar St. Otranto Martyrs ~ Antonio Primaldo St. Odran of Iona Bl. Otto Neururer St. Otto of Bamberg St. Oudaceus St. Ouen St. Owen
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