O
- Oadby
- Oadby, Leicestershire
- Oad Street
- Oakamoor
- Oak Cross
- Oakdale
- Oakdale
- Oake
- Oaken
- Oakenclough
- Oakengates
- Oakenholt
- Oakenshaw
- Oakenshaw
- Oakenshaw
- Oakerswood
- Oakerthorpe
- Oakes
- Oakfield
- Oakford
- Oakham
- Oak Hangar, Hampshire
- Oakhanger
- Oakhanger
- Oakhill
- Oakington
- Oaklands
- Oaklands
- Oakle Street, Gloucestershire
- Oakley
- Oakley
- Oakley
- Oakley
- Oakley
- Oakley Folly
- Oakley Park
- Oakmere
- Oaks
- Oaksey
- Oakshaw
- Oakthorpe
- Oaktree Hill
- Oakwood
- Oakwood
- Oakwood
- Oakwoodhill
- Oakworth
- Oare
- Oare
- Oasby
- Oathe
- Oathill
- Oathills
- Oathlaw
- Oatlands
- Oatlands Park, Surrey
- Oban
- Obbe, Eilean Siar
- Obinan
- Obley
- Oborne
- Occaney
- Occleston
- Occold
- Occumster, Highland
- Ochiltree
- Ochtermuthill
- Ochtertyre
- Ochtow, Highland
- Ockbrook
- Ocker Hill
- Ockham
- Ockle
- Ockley
- Ocle Pychard
- Octon
- Odcombe, Somerset
- Oddington
- Oddington
- Odell
- Odie
- Odiham
- Odsey
- Odstock
- Odstone
- Offchurch
- Offenham
- Offerton
- Offham
- Offham
- Offord Cluny
- Offord D'Arcy, Cambridgeshire
- Offton
- Offwell
- Ogbourne Maizey
- Ogbourne Saint Andrew, Wiltshire
- Ogbourne St. George
- Ogdens
- Ogil
- Ogle
- Ogmore-by-Sea
- Ogmore, The Vale Of Glamorgan
- Ogmore Vale
- Oil Terminal
- Okeford Fitzpaine
- Okehampton
- Okehampton Camp
- Okeover, Staffordshire
- Olchard
- Old
- Old Aberdeen
- Old Alresford
- Oldany, Highland
- Old Arley
- Old Bailey, City of London
- Old Basford
- Old Basing
- Oldberrow
- Old Bewick
- Old Bolingbroke
- Old Boston, St. Helens
- Old Boston Trading Estate
- Old Brampton, Derbyshire
- Old Bridge of Urr, Dumfries and Galloway
- Old Brookend
- Old Buckenham
- Old Burghclere
- Oldbury
- Oldbury
- Oldbury
- Oldbury Naite
- Oldbury On Severn
- Oldbury on the Hill, Gloucestershire
- Old Byland
- Old Cassop
- Oldcastle
- Oldcastle, Monmouthshire
- Old Castleton
- Old Catton
- Old Chalford
- Old Church Stoke
- Old Clee
- Old Cleeve
- Old Clipstone
- Old Colwall
- Old Colwyn
- Oldcotes
- Old Coulsdon
- Old Craig
- Old Craighall
- Oldcroft
- Old Crombie
- Old Dailly
- Old Dalby
- Old Deer
- Old Derry Hill
- Old Dilton
- Old Edlington
- Old Eldon
- Old Ellerby
- Oldends
- Oldfallow
- Old Felixstowe
- Oldfield
- Oldford
- Old Ford
- Old Furnace
- Old Goole
- Old Gore
- Old Grimsby
- Old Hall
- Old Hall
- Old Hall
- Old Hall Green
- Oldham
- Oldhamstocks
- Old Hartley
- Old Heathfield
- Old Hill, Sandwell
- Old Hunstanton
- Old Hurst
- Old Hutton, Cumbria
- Old Kent Road, Southwark
- Old Kilpatrick
- Old Kinnernie
- Old Knebworth
- Old Lackenby
- Old Lakenham
- Oldland Common
- Old Langho
- Old Leake
- Old Malton
- Oldmeldrum
- Old Micklefield, Leeds
- Old Mill
- Old Milverton
- Oldmixon
- Old Monkland, North Lanarkshire
- Old Newton
- Old Oscott
- Old Park
- Old Park
- Old Penshaw, Sunderland
- Old Quarrington
- Old Radnor
- Old Rattray
- Old Ravensworth
- Old Rayne
- Old Romney
- Old Sarum, Wiltshire
- Old Sauchie
- Old Scone
- Old Shields
- Oldshore Beg, Highland
- Old Shoreham
- Oldshore, Highland
- Oldshoremore
- Old Snydale
- Old Sodbury
- Old Somerby
- Old Springs
- Oldstead
- Old St Mellons
- Old Storridge
- Old Stratford
- Old Street
- Old Street, Hackney
- Old Sunderlandwick
- Old Swan
- Old Swarland
- Old Tebay
- Old Town
- Old Town
- Old Town
- Old Town, East Sussex
- Oldtown Of Aigas, Highland
- Oldtown of Ord
- Old Trafford
- Old Tupton
- Old Walker, Newcastle Upon Tyne
- Old Warden
- Oldways End, Devon
- Old Weston
- Oldwhat
- Old Whittington
- Old Windsor
- Oldwinsford
- Old Wives Lees
- Old Woking
- Oldwood
- Old Woodhall
- Olgrinmore
- Ollaberry
- Ollach, Highland
- Ollerton
- Ollerton
- Ollerton
- Olmstead Green
- Olney
- Olrig House
- Olton
- Olveston
- Omagh
- Ombersley
- Ompton
- Once Brewed
- Onecote, Staffordshire
- Onehouse
- Ongar
- Ongar Street
- Onibury, Shropshire
- Onich
- Onllwyn
- Onneley
- Onslow Village
- Openshaw
- Opinan
- Oragaig, Argyll and Bute
- Orbiston
- Orbliston
- Orbost
- Orby
- Orchard Leigh
- Orchard Windham
- Orcheston
- Orcop
- Ord
- Ord
- Ordhead
- Ordie, Aberdeenshire
- Ordsall
- Ore
- Oreham Common
- Oreton
- Orford
- Organford
- Orgreave
- Orgreave, Rotherham
- Orinsay
- Oritor
- Orkney
- Orkney
- Orlestone, Kent
- Orleton
- Orlingbury
- Ormacleit
- Ormesby
- Ormesby
- Ormesby, Middlesbrough
- Ormesby Saint Margaret, Norfolk
- Ormesby St. Michael
- Ormiscaig
- Ormiston
- Ormsaigmore
- Ormsdale
- Ormskirk
- Orphir
- Orpington
- Orrell
- Orrell Park
- Orrell Post
- Orrok House
- Orroland
- Orsett
- Orslow
- Orston
- Orton
- Orton
- Orton
- Orton Longueville
- Orton-on-the-Hill
- Orton Park
- Orton Rigg
- Orton Southgate
- Orton Waterville
- Orton Wistow
- Orwell
- Osbaldeston
- Osbaldwick
- Osbaston
- Osbaston
- Osbaston
- Osberton
- Osborne, Isle of Wight
- Osbournby
- Oscroft
- Osea Island
- Osgathorpe
- Osgodby
- Osgoodby
- Oskaig
- Osmaston
- Osmington
- Osmington Mills
- Osmotherley
- Ospringe
- Ossemsley
- Ossett
- Ossington
- Osterley
- Oswaldkirk
- Oswaldtwistle
- Oswestry
- Otford
- Otham
- Othery
- Otley
- Otley
- Otterbourne
- Otterburn
- Otterburn
- Otterburn Camp
- Otterden, Kent
- Otter Ferry
- Otterford
- Otterham
- Otterhampton
- Ottershaw
- Otterspool
- Otterton
- Ottery Saint Mary
- Ottinge
- Ottringham
- Oughterby
- Oughtershaw
- Oughterside
- Oughtibridge
- Oulston
- Oulton
- Oulton
- Oulton
- Oulton
- Oulton
- Oulton Broad
- Oulton Heath
- Oulton Street
- Oundle
- Ousby
- Ousdale
- Ousden, Suffolk
- Ousefleet
- Ouston
- Outer Hope, Devon
- Outertown
- Outgate
- Outhgill, Cumbria
- Outhill
- Outlane
- Out Newton
- Out Rawcliffe
- Outwell
- Outwood
- Outwood
- Outwoods
- Ouzlewell Green, Leeds
- Oval
- Oval, Lambeth
- Ovenden
- Ovenstone
- Over
- Over
- Over
- Over Alderley
- Overbury, Worcestershire
- Over, Cheshire West and Chester
- Overcombe, Dorset
- Over Compton
- Over Haddon
- Over Hulton
- Over Kellet
- Overley
- Over Norton
- Over Peover
- Overscaig
- Overseal
- Over Silton
- Oversland
- Oversley Green
- Overstone
- Over Stowey
- Overstrand
- Over Tabley
- Overthorpe
- Overton
- Overton
- Overton
- Overton
- Overton
- Overton
- Overton
- Overton Common
- Overtown
- Over Wallop
- Over Whitacre, Warwickshire
- Over Worton
- Over Wyresdale
- Oving
- Oving
- Ovingdean, Brighton and Hove
- Ovingham
- Ovington
- Ovington
- Ovington
- Ovington
- Ovington, Hampshire
- Ower
- Owermoigne
- Owersby Moor
- Owlerton
- Owlpen
- Owmby-by-Spital
- Owmby, Lincolnshire
- Owslebury
- Owston
- Owston Ferry
- Owthorpe
- Oxborough
- Ox Close
- Oxcombe
- Oxen End
- Oxen Fell
- Oxenhall
- Oxenholme
- Oxenhope
- Oxenton
- Oxenwood, Wiltshire
- Oxford
- Oxford Circus
- Oxford Circus, Westminster
- Oxford Street, Westminster
- Oxgangs
- Oxhey
- Oxhill
- Oxhill
- Oxley
- Oxley Green
- Oxlynch
- Oxnam
- Oxnop Ghyll
- Oxshott
- Oxspring
- Oxted
- Oxton
- Oxton
- Oxton
- Oxwich
- Oxwick
- Oykel Bridge
- Oyne
- Oystermouth, Swansea
- Ozendyke
- Ozleworth