O

Oaten Hill Martyrs

Odile, Saint

Odilo of Cluny, Saint

Odo of Canterbury, Saint

Odo of Cluny, Saint

Odoric of Pordenone, Saint

Odulf, Saint

Óengus of Tallaght, Saint

Olaf, Saint

Oliver Plunkett, Saint

Olympia the Deaconess, Saint

Omer, Saint

Onesimus, Saint

Onophrius, Saint

Opportuna, Saint

Optatus of Milevis, Saint

Orange, Martyrs of

Oringa della Croce, Blessed

Osanna of Mantua, Blessed

Osgyth, Saint

Osmund of Salisbury, Saint

Oswald of Northumbria, Saint

Oswald of Worcester, Saint

Oswin, Saint

Othmar, Saint

Otto of Bamberg, Saint