| |
| Obazine |
| Oberried |
| Oberröblingen / Rohrbach |
| Oberschönenfeld |
| Oberweimar |
| Oberwesel / Allerheiligen |
| Obona |
| Obra |
| Ocre, Santo Spirito d’ |
| Odivelas, São Dinis |
| Oelenberg |
| Offida, San Bernardo di |
| Oita |
| Oka |
| Old Byland |
| Olieux, Les |
| Oliva, La |
| Olives, N.D. de / Les Olieux de Lec |
| Olive. L´ (B) |
| Olivella, San Bartolomeo all’ |
| Olivet |
| Oliwa |
| Olizarowystaw / Clarus Fons |
| Olmedo, S. Spiritus |
| Olmo, San Vittorello all’ |
| Olobok |
| Olsberg |
| Øm Kloster |
| Oost-Eekloo |
| Oosthoeck |
| Ophoven / Dalheim
|
| Oppenheim / Mariacron |
| Oraison-Dieu, l’ |
| Orgelet |
| Orienten |
| Ormont |
| Orsha |
| Orsonnens |
| Orval |
| Orvieto, SS. Trinità di |
| Oseira |
| Osek |
| Oslavany |
| Osterode |
| Ostrog / Ostroh |
| Osuna (Calatrava) |
| Otero de las Dueñas |
| Otterberg |
| Oudenbosch |
| Oudun |
| Ounans / Dole |
| Our Lady and St. Bernard |
| Ourdenaarde |
| Ourscamp |
| Outre-Aube |
| Ouville-l'Abbaye |
| Ovila |
| Owinska |
| Oxford, St. Bernard's College |
| Oya / Oia
|
| Oyón / Barria |