| Old Hunstanton | Old Hurst | Old Hutton |
| Old Hutton and Holmescales | Old Ideas | Old Isaacs |
| Old Jāsk | Old Jewish Man | Old Kilcullen |
| Old Kilpatrick | Old Langho | Old Laund Booth |
| Old Law | Old Leake | Old Lindley |
| Old Liwonde Boma | Old London Wasa | Old Louisiana |
| Old Lyme | Old Lyme, Connecticut | Old MacDonald Had a Farm |
| Old Malda | Old Maldah | Old Man |
| Old Man of Coniston | Old Man of Hoy | Old Man of the South Pole |
| Old Man On His Back Plateau | Old Man's Child | Old man's child |
| Old Man’s Fall | Old mans child | Old Mans Child |
| Old Mans Head | Old Mans Head (udde) | Old Marston |
| Old McDonald Had a Farm | Old Meldrum | Old Milverton |
| Old Money | Old Money (Simpsons) | Old Monroe |
| Old Monroe, Missouri | Old Moor | Old Mutual |
| Old Navy | Old Newton | Old Newton with Dagworth |
| Old Newton with Dagworth (lsjbot) | Old Noarlunga | Old Noll |
| Old Orchard Beach | Old Orchard Beach, Maine | Old Order River Brethren |
| Old Panamao | Old Park River | Old Possum's Book of Practical Cats |
| Old Post Office Pavilion | Old Providence Island | Old Pulteney Distillery |
| Old Radnor | Old Radnor (community) | Old Radnor (ort) |
| Old Rasmus | Old Rayne | Old Red Sandstone |
| Old Road | Old Road (ort i Antigua och Barbuda) | Old Road Town |
| Old Road Village | Old Romney | Old Romney (ort) |
| Old Romney (parish) | Old Sarum Castle | Old Saybrook |
| Old Saybrook, Connecticut | Old School | Old school |
| Old School Training | Old Skoöl of Rock | Old Skoöl Of Rock |
| Old Sodbury | Old Somerby | Old Somerby (ort) |
| Old Somerby (parish) | Old Songs vs. New Beats | Old Soul |
| Old Sparky | Old Speckled Hen | Old spice |
| Old Spice | Old Squaw Islands | Old St Mellons |
| Old St. Mellons | Old Star | Old Station |
| Old Station, Kalifornien | Old Stone | Old Stratford |
| Old Stratford and Drayton | Old Sukkertoppen | Old Swede's Church |
| Old Tabler Sverige | Old Tafo | Old Tappan |
| Old Tappan, New Jersey | Old Tebay | Old Time Hockey |
| Old Tjikko | Old Town | Old Town, Maine |
| Old Trafford | Old Trafford Cricket Ground | Old Vic |
| Old Wallow | Old Warden | Old Wardour Castle |
| Old Ways | Old Well | Old Weston |
| Old Weston (ort) | Old Weston (parish) | Old Windsor |
| Old Windsor (distriktshuvudort) | Old Wives Lake | Old Wives Lees |
| Old Woman River | Old Woman River (vattendrag i Kanada) | Old Woman’s Hill |
| Old Woodhall | Old Woughton | Old Yeller |
| Old Yeller klarar allt | Old, New, Borrowed and Blue | Old-fashioned-glas |
| Old-Fashioned-glas | Old-Fashionedglas | Oldaker, Jamie |
| Oldambt | Oldany Island | Oldarhian |
| Oldābāri | Oldén, Stig | Oldřiš |
| Oldřiš (ort i Tjeckien, lat 49,73, long 16,19) | Oldřiš (ort i Tjeckien, lat 49,78, long 16,01) | Oldřišov |
| Oldřich Černík | Oldřich Heidrich | Oldřich Kolář |
| Oldřich Lajsek | Oldřich Machač | Oldřich Macháč |
| Oldřich Nejedlý | Oldřich Rott | Oldřich Svojanovský |
| Oldřich Zábrodský | Oldřichov | Oldřichov (ort i Tjeckien, Olomouc) |
| Oldřichov (ort i Tjeckien, Södra Böhmen) | Oldřichov u České Lípy | Oldřichov v Hájích |
| Oldřichovice | Oldbawn | Oldberg |
| Oldbergssjön | Oldberrow | Oldboy |
| Oldbury | Oldbury (del av en befolkad plats) | Oldbury (grevskapshuvudort) |
| Oldbury (olika betydelser) | Oldbury Camp | Oldbury kärnkraftverk |
| Oldbury Nuclear Power Station | Oldbury nuclear power station | Oldbury on the Hill |
| Oldbury, Shropshire | Oldbury, Warwickshire | Oldbury, West Midlands |
| Oldbury-on-Severn | Oldbury-upon-Severn | Oldbury-upon-Severn (parish) |
| Oldcastle | Oldcastle (distrikt) | Oldcastle (ort) |
| Oldcastle (slott i Storbritannien, Wales) | Oldcastle, Cheshire | Oldcastle, Monmouthshire |
| Olde English | Olde English 800 | Olde English Bulldogge |
| Olde english bulldogge brasileiro | Olde English cyder | Olde Fort Erie |
| Olde, Emanuel | Oldebroek | Oldeen, Björn |
| Oldehore | Olden | Olden, Charles Smith |
| Oldenbarnevelt | Oldenbarnevelt, Johan van | Oldenbüttel |
| Oldenberg | Oldenberg, Hermann | Oldenbergiella |
| Oldenbergiella blascoi | Oldenbergiella brumalis | Oldenbergiella calcarifera |
| Oldenbergiella callosa | Oldenbergiella canalicata | Oldenbergiella pappi |
| Oldenbergiella seticerca | Oldenbergiella vernalis | Oldenborstel |
| Oldenburg | Oldenburg (1628) | Oldenburg (berg) |
| Oldenburg (efternamn) | Oldenburg (fartyg) | Oldenburg (Holstein) |
| Oldenburg (land) | Oldenburg (Oldenburg) | Oldenburg (olika betydelser 2) |
| Oldenburg (olika betydelser) | Oldenburg in Holstein | Oldenburg, Acke |
| Oldenburg, Claes | Oldenburg, Frederik | Oldenburg, Ivar |
| Oldenburg, Jerk | Oldenburg, Miriam | Oldenburg, Mount |
| Oldenburg, Theodor Vilhelm | Oldenburg-Sönderborg-Glücksburg | Oldenburgare |
| Oldenburger Land | Oldenburgia | Oldendorf |
| Oldendorf (Luhe) | Oldendorf, Schleswig-Holstein | Oldendorf, Stade |
| Oldenhütten | Oldenhorn | Oldenico |
| Oldenlandia | Oldenlandia abyssinica | Oldenlandia accedens |
| Oldenlandia acerosa | Oldenlandia acicularis | Oldenlandia acutangula |
| Oldenlandia acutidentata | Oldenlandia adscensionis | Oldenlandia aegialodes |
| Oldenlandia aemulans | Oldenlandia affinis | Oldenlandia alata |
| Oldenlandia albidopunctata | Oldenlandia albonervia | Oldenlandia amatymbica |
| Oldenlandia amboensis | Oldenlandia ampliflora | Oldenlandia angolensis |
| Oldenlandia angolensis var. hirsuta | Oldenlandia angustifolia | Oldenlandia angustifolia var. pedicellata |
| Oldenlandia aparine | Oldenlandia apoensis | Oldenlandia arborea |
| Oldenlandia arenaria | Oldenlandia arenarioides | Oldenlandia aretioides |
| Oldenlandia argillacea | Oldenlandia arguta | Oldenlandia aridosa |
| Oldenlandia arnottiana | Oldenlandia articularis | Oldenlandia aspera |
| Oldenlandia asperuliflora | Oldenlandia assimilis | Oldenlandia attenuata |
| Oldenlandia auricularia | Oldenlandia auricularia var. procumbens | Oldenlandia azurea |
| Oldenlandia balfourii | Oldenlandia banksii | Oldenlandia barbata |
| Oldenlandia barberi | Oldenlandia beddomei | Oldenlandia benguellensis |
| Oldenlandia benguetensis | Oldenlandia bicornuta | Oldenlandia biflora |
| Oldenlandia bodinieri | Oldenlandia bojeri | Oldenlandia bonincola |
| Oldenlandia borrerioides | Oldenlandia boscii | Oldenlandia bourdillonii |
