| oxeltand | molar |
| Oxelösunds kommun | Oxelösund Municipality |
| Oxen | Taurus |
| Oxenstierna | Oxenstierna |
| Oxfilé | Net |
| Oxford | Oxford |
| Oxford Street | Oxford Street |
| oxford- | oxonion |
| Oxfordbestämmelserna | Provisions of Oxford |
| Oxfordrörelsen | Oxford Movement |
| Oxfords universitet | University of Oxford |
| Oxfordshire | Oxfordshire |
| Oxfordskor | Oxford shoe |
| oxgroda | bullfrog |
| oxid | oxide |
| oxidation | oxidation |
| oxidationsreduktion | oxidation-reduction |
| Oxidationstillstånd | Oxidation state |
| Oxidativ stress | Oxidative stress |
| oxider | oxide |
| oxidera | oxidize |
| oxiderande medel | oxidising agent |
| oxiderbart material | oxidisable material |
| oxidering | oxidation |
| oxkött | beef |
| oxlik | bovine |
| Oxo-syntes | Hydroformylation |
| Oxoniumjon | Oxonium ion |
| oxpiska | bullwhip |
| oxplöjarskrift | boustrophedon |
| oxstek | sirloin |
| oxsvans | oxtail |
| Oxtunga | Anchusa officinalis |
| oxygen | oxygen |
| Oxygène | Oxygen |
| Oxykodon | Oxycodone |
| Oxyrhynchus | Oxyrhynchus |
| Oxytocin | Oxytocin |
| oxögonfisk | bogue |
| OY | Oy |
| Oy Hartwall Ab | Hartwall |
| Oy Sinebrychoff Ab | Sinebrychoff |
| Oyo | Oyo State |
| Oyá | Oya |
| Oz | Ounce |
| Ozamis City | Ozamiz City |
| Ozcar Wendt | Oscar Wendt |
| ozelot | ocelot |
| ozon | ozone |
| ozonisering | ozonisation |
| Ozonlagret | Ozone layer |
| ozonnedbrytande faktor | ozone depletion potential |
| ozonnedbrytningspotential | ozone depletion potential |
| ozonskikt | ozone layer |
| Ozu Yasujiro | Yasujirō Ozu |
| Ozymandias | Ozymandias |
| Ozzy Osbourne | Ozzy Osbourne |
| oäkta | fictitious |
| oäkta börd | bastardy |
| Oäkta karettsköldpadda | Loggerhead Sea Turtle |
| oändlig | permanent |
