| overpris | surcharge |
| overraskelse | surprise |
| overrasket | surprised |
| overrumplet | aback |
| overskrevs | astride |
| overskyet | cloudy |
| overskæg | moustache |
| oversvømmelse | overflow |
| oversvømmelsesprognose | flood forecast |
| oversætte | interpret |
| oversættelse | translation |
| oversættelsesordbog | translation dictionary |
| oversætter | translator |
| Oversættere til dansk | List of translators |
| Oversø | Oeversee |
| overtag | ascendancy |
| overtagelse | takeover |
| overtro | superstition |
| overvejelse | consideration |
| overvintring | overwintering |
| overvågning | surveillance |
| overvågning af atmosfæren | atmospheric monitoring |
| overvågning af forurenende stoffer | pollutant monitoring |
| overvågning af forurening | pollution monitoring |
| overvågning af luftkvalitet | air quality monitoring |
| overvågningskriterium | monitoring criterion |
| overvågningsliste | watchlist |
| overvågningsmetode | monitoring technique |
| overvågningsnet | monitoring network |
| overvågningsudstyr | monitoring equipment |
| overvægt | obesity |
| Overijssel | Overijssel |
| ovn | furnace |
| Owen Wilson | Owen Wilson |
| Oxenstierna | Oxenstierna |
| Oxford | Oxford |
| Oxford Universitet | University of Oxford |
| Oxfordbevægelsen | Oxford Group |
| Oxfordshire | Oxfordshire |
| Oxid | Oxide |
| oxidationsreduktion | oxidation-reduction |
| Oxidationstrin | Oxidation state |
| oxider | oxide |
| oxiderbart materiale | oxidisable material |
| oxideringsmiddel | oxidising agent |
| oxygen | oxygen |
| Oxygene | Oxygen |
| Oxymoron | Oxymoron |
| Oxytocin | Oxytocin |
| ozon | ozone |
| ozonfortyndingspotentiale | ozone depletion potential |
| ozonisering | ozonisation |
| ozonlag | ozone layer |
| Ozonlaget | Ozone layer |
| Ozzy Osbourne | Ozzy Osbourne |
