- Nymagee
- Ó Luanaigh, Dónall, Keeper of Collections at NLI
- O Street NW
- O’Curry College
- O’Donovan’s Row
- Oahu
- Oakamoor
- Oakham
- Oakland
- Oakland Avenue
- Oaklands Park
- Oakleigh (Victoria)
- Oakley Road
- Oaxaca
- Oberland
- Oberstown (Dublin)
- Oberstown (Kildare)
- Oberwiel
- O'Brien Street
- O'Brien's Place
- Observatoire royal de Belgique
- O'Callaghan's Mills
- Ocaña
- Occitanie
- Ociąż
- O'Connell Avenue
- O'Connell Street (Dublin)
- O'Connell Street (Ennis)
- O'Connell Street (Limerick)
- O'Connell Street (Sydney)
- O'Connell's Secondary School (Richmond Street North)
- O'Connor Hospital
- O'Connor Square
- Octagon
- Oczacz
- Odense
- Odessa
- Odisha
- Odlums Factory
- O'Donovan Rossa Street
- Odstock
- Offenbacher Landstraße
- Ohio
- Oise
- Ōita
- Okayama
- Okinawa
- Oklahoma
- Oklahoma City
- Old Abbey Cemetery
- Old Airport Road
- Old Belvedere RFC
- Old Connaught
- Old Court
- Old Dublin Road
- Old Dublin Society
- Old Dundalk Road
- Old Finglas Road
- Old Haji Camp
- Old Hall Green
- Old Kilcolman Cemetery
- Old Leeds Road
- Old Mission Santa Inés
- Old Oscott
- Old Peak Road
- Old Willow Road
- Old Windsor
- Oldcastle
- Oldchurch
- Oldconnell
- Oldtown
- Olinda College
- Oliver Plunkett Street
- Ollerton
- Olomouc
- Olympia
- Omagh
- Omagh Technical College
- Omaha
- Omeath
- Omey
- Oña
- Oñáte
- One Pacific Place
- Onslow
- Ontario
- Oola
- Oola National School
- Opletalova
- Oppenheimer College of Social Service
- O'Rahilly Street
- Oran
- Oran more
- Orange
- Oranmore
- Oratorio de San Celso
- Orchard House
- Orchard Terrace (Omagh)
- Orchardstown Drive
- Orduña-Urduña
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