| Ooty, Church and Cemetery | | | en | 0 |
| Oostdongeradeel (Anjum) Protestant Churchyard | | | en | 1 |
| Oosterhout, Begraafplaats Leijsenakkers | | | en | 0 |
| Oost-cappel Churchyard | | | en | 13 |
| Oostvoorne Roman Catholic Cemetery | | | en | 1 |
| Oostelbeers Roman Catholic Churchyard | | | en | 7 |
| Oostende, Oostende New Communal Cemetery Cwgc | | | en | 334 |
| Oostende, Cemetery | | | en | 0 |
| Oostende, Ostend City Cemetery | | | en | 0 |
| Oodnadatta, Oodnadatta Cemetery | | | en | 0 |
| Oodnadatta, Oodnadatta Pioneer Cemetery | | | en | 0 |
| Oostvoorne Protestant Cemetery | | | en | 6 |
| Oosterhesselen (Geesbrug) General Cemetery | | | en | 2 |
| Oostrozebeke Communal Cemetery | | | en | 2 |
| Oosterhout Protestant Cemetery | | | en | 11 |
| Ootmarsum Protestant Cemetery | | | en | 4 |
| Oosterwolde General Cemetery, Oldebroek | | | en | 11 |
| Oostkerke Communal Cemetery | | | en | 1 |
| Ooike Churchyard | | | en | 5 |
| Oostvleteren Churchyard | | | en | 16 |