- Oadby, Leicestershire
- Oakdale, Caerphilly
- Oakham, Rutland
- Oakley, Hampshire
- Oban, Argyll and Bute
- Ockbrook, Derbyshire
- Okehampton, Devon
- Old Basing, Hampshire
- Oldham, Greater Manchester
- Oldmeldrum, Aberdeenshire
- Ollerton, Nottinghamshire
- Olney, Buckinghamshire
- Omagh, Co. Tyrone
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- Orkney Islands, Orkney Islands
- Ormskirk, Lancashire
- Orpington, Bromley
- Ossett, West Yorkshire
- Oswaldtwistle, Lancashire
- Oswestry, Shropshire
- Ottery St Mary, Devon
- Oundle, Northamptonshire
- Overcombe, Dorset
- Overseal, Derbyshire
- Overton, Hampshire
- Oxley, West Midlands
- Oxted, Surrey
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