- Orby
- Orcheston
- Orlestone
- Orlingbury
- Ormesby
- Ormesby St Margaret
- Ormskirk
- Orpington
- Orsett
- Orston
- Orton
- Orton on the Hill
- Orton Waterville
- Osbournby
- Osmaston
- Osmington
- Osmotherley
- Ospringe
- Ossett
- Ossington
- Oswaldkirk
- Oswaldtwistle
- Otford
- Othery
- Otterbourne
- Otterden
- Otterford
- Otterham
- Otterhampton
- Ottershaw