| Ohio | Ohio |
| Ohio - Columbus | Staten van de Verenigde Staten |
| Ohio County | Ohio County |
| Ohio River | Ohio |
| Ohio Wesleyan University | Universiteit van Wesleyan |
| Ohkay Owingeh Pueblo | San Juan |
| Ohlenhard | Ohlenhard |
| Ohlone | Ohlone |
| Ohlsbach | Ohlsbach |
| Ohlstadt | Ohlstadt |
| ohm | ohm |
| Ohmden | Ohmden |
| Ohmstal | Ohmstal |
| Ohne | Ohne |
| Ohnesorge number | Getal van Ohnesorge |
| Ohrdruf | Ohrdruf |
| Ohrekreis | Ohrekreis |
| Ohrenbach | Ohrenbach |
| Ohrid | Ohrid |
| Ohrid municipality | Ohrid |
| Ohrum | Ohrum |
| Ohthere from Hålogaland | Ottar |
| Ohře | Eger |
| Oiapoque | Oiapoque |
| Oiartzun | Oiartzun |
| OIC | Oh |
| OICETS | Kirari |
| Oidium | Meeldauw |
| Oier Olazábal Paredes | Oier Olazábal |
| Oikoumene | Oecumene |
| oil | smeren |
| oil change | olieverversing |
| oil color | olieverf |
| Oil crisis | Oliecrisis |
| oil field | olieveld |
| Oil man | Mammoettanker |
| oil of turpentine | terpentijn |
| oil paint | olieverf |
| oil painting | olieverfschilderij |
| oil pan | carter |
| Oil phase-out in Sweden | Olie uitfaseren |
| Oil platform | Productieplatform |
| oil rig | booruitrusting |
| oil slick | olievlek |
| oil tanker | olietanker |
| oil well | oliebron |
| oil-bearing | oliehoudend |
| Oil-drop experiment | Proef van Millikan |
| Oil-for-Food Programme | Olie voor voedsel |
| oilcan | oliebusje |
| oilcloth | wasdoek |
| Oileus | Oileus |
| oiling | smeren |
| oilskin | oliejas |
| oilskin raincoat | oliejas |
| oilskin suit | oliepak |
| oilskins | oliepak |
| oily | vettig |
| Oiniades | Oiniades |
| oink | knorren |
| ointment | smeersel |
| ointment for burns | brandzalf |
| Oirats | Oirat-Mongolen |
| Oireachtas | Oireachtas |
| Oisc of Kent | Oisc van Kent |
| Oise | Oise |
| Oise River | Oise |
| Oita Trinita | Oita Trinita |
| Ojen | Ojén |
| Ojibwa | Ojibweg |
| Ojibwe writing systems | Ojibwe |
| Ojos del Salado | Ojos del Salado |
| OK | goed |
| OK Budućnost Podgorica | FK Budućnost Podgorica |
| OK Go | OK Go |
