| often | freqüentemente |
| Ofterdingen | Ofterdingen |
| ofthle | de |
| Oftringen | Oftringen |
| Og Mandino | Og Mandino |
| Oga Peninsula | Península de Oga |
| Ogaden War | Guerra de Ogaden |
| OGame | OGame |
| Ogbomosho | Ogbomosho |
| Ogcocephalidae | Ogcocephalidae |
| Ogden | Ogden |
| Ogden Nash | Frederic Ogden Nash |
| Ogdensburg | Ogdensburg |
| Ogens | Ogens |
| Ogg | Ogg |
| Ogg Media | OGM |
| Oggau am Neusiedler See | Rio Oka |
| Oggelshausen | Oggelshausen |
| Oggiono | Oggiono |
| Ogham | Ogham |
| ogive | ogiva(a) |
| ogle | comer com os olhos |
| Oglio | Rio Oglio |
| Ogooué-Ivindo | Ogooué-Ivindo |
| Ogooué-Lolo | Ogooué-Lolo |
| Ogooué-Maritime | Ogooué-Maritime |
| Ogoun | Ogum |
| ogre | bicho-papão |
| ogrehr | ogreo(a) |
| Ogum | Ogum |
| Ogun State | Ogum |
| oh | oh |
| oh boy! | caramba ! |
| oh well | bem |
| Ohangwena Region | Ohangwena |
| Ohio | Ohio |
| Ohio - Columbus | Estados dos Estados Unidos da América |
| Ohio class submarine | Classe Ohio |
| Ohio County | Condado de Ohio |
| Ohio River | Rio Ohio |
| Ohio State University | Universidade do Estado de Ohio |
| Ohio Wesleyan University | Universidade de Wesleyan em Ohio |
| Ohkay Owingeh Pueblo | San Juan |
| Ohlsbach | Ohlsbach |
| ohm | ohm |
| Ohm River | Ohm |
| Ohm's law | Lei de Ohm |
| Ohmden | Ohmden |
| Ohmstal | Ohmstal |
| Ohrady | Ohrady |
| Ohrdruf | Ohrdruf |
| Ohrekreis | Ohrekreis |
| Ohrenbach | Ohrenbach |
| Ohrid | Ohrid |
| Ohrid municipality | Ohrid |
| Ohře | Rio Ohře |
| Oiapoque | Oiapoque |
| Oidium | Oídio |
| Oignon | Cebola |
| oil | petróleo |
| oil and fat industry | indústria de óleos e gorduras |
| Oil and Natural Gas Corporation | Oil and Natural Gas Corporation Limited |
| oil binding agent | aditivos de ligação |
| oil boom | barreiras contentoras |
| oil change | troca de óleo |
| oil cloth | encerado (tecido) |
| oil color | tinta a óleo |
| oil disaster | derrames de petróleo |
| oil exploration | exploração de petróleo |
| oil extraction | extracção de petróleo |
| oil field | zona petrolífera |
| oil lamp | candeia |
| Oil of olives | Azeite |
| oil of turpentine | terebintina |
| oil paint | tinta a óleo |
| oil painting | pintura a óleo |
| oil pan | cárter |
| oil pipeline | oleoduto |
| oil pollution | poluição por hidrocarbonetos |
| oil pollution abatement | diminuição de poluição por hidrocarbonetos |
| oil production | produção de petróleo |
| Oil quality | Óleo |
| oil recovery vessel | navios recuperadores de petróleo |
| oil refinery | refinarias de petróleo |
| oil residue recuperation | resíduos petrolíferos |
| oil rig | plataforma de petróleo |
