| officially | oficjalnie |
| Officially deny | Sprostować |
| Officina Typographica | Druk |
| Officine Meccaniche | Officine Meccaniche |
| Offingen | Offingen |
| Offline browsing | On-line |
| offset policy | handel emisjami |
| offshore mining | wydobycie z dna morza |
| Offside | Spalony |
| Offside law | Spalony |
| Offsidely | Spalony |
| offspring | nasienie |
| OFI Crete | OFI Kreta |
| ofimática | biurotyka |
| OFK Beograd | OFK Belgrad |
| Oflag | Oflag |
| Ofloxacin | Ofloksacyna |
| Ofra Haza | Ofra Haza |
| often | często |
| Ofterdingen | Ofterdingen |
| Ofterschwang | Ofterschwang |
| Oftersheim | Oftersheim |
| Ogaden | Somali |
| OGame | OGame |
| Ogbomosho | Ogbomosho |
| OGC Nice | OGC Nice |
| Ogcocephalidae | Ogackowate |
| Ogden | Ogden |
| Ogden Nash | Ogden Nash |
| Ogens | Ogens |
| Ogg | Ogg |
| Ogg Media | OGM |
| Ogg Writ | Writ |
| Oggau am Neusiedler See | Oka |
| Oggelshausen | Oggelshausen |
| Oggiono | Oggiono |
| Oggy and the Cockroaches | Oggy i karaluchy |
| Ogham | Pismo ogamiczne |
| Oghuz languages | Języki oguzyjskie |
| Oglio | Oglio |
| Ogma | Ogma |
| Ognjen Koroman | Ognjen Koroman |
| Ognjeslav Kostović Stepanović | Ogniesław Kostowicz Stepanowicz |
| ogonek | ogonek |
| Ogooué River | Ogowe |
| Ogooué-Ivindo | Ogowe-Ivindo |
| Ogooué-Maritime | Ogowe Nadmorskie |
| Ogosta | Ogosta |
| Ogoun | Ogoun |
| ogre | ogr |
| Ogre County | Okręg Ogre |
| Ogre District | Okręg Ogre |
| Ogrodzieniec | Ogrodzieniec |
| Ogum | Ogoun |
| Ogun State | Ogun |
| Oguz | Rejon Oguz |
| Ogyen Trinley Dorje | Ogjen Trinlej Dordże |
| Ogygia | Ogygia |
| oh | ach |
| Ohel Jakob synagogue | Synagoga Ohel Jakob w Monachium |
| Ohio | Ohio |
| Ohio - Columbus | Podział terytorialny Stanów Zjednoczonych |
| Ohio class submarine | Okręty podwodne typu Ohio |
| Ohio County | Hrabstwo Ohio |
| Ohio River | Ohio |
| Ohio Wesleyan University | Uniwersytet Wesleyan |
| Ohkay Owingeh Pueblo | San Juan |
| Ohlsbach | Ohlsbach |
| Ohlstadt | Ohlstadt |
| ohm | om |
