| originell | unusual |
| originellt | eccentrically |
| Origlio | Origlio |
| Orikalkum | Orichalcum |
| oriktig | wrong |
| oriktig framställning | misrepresentation |
| oriktig gärning | wrongful act |
| oriktig proportion | disproportion |
| oriktighet | falsity |
| oriktigt | erroneously |
| orimlig | preposterous |
| orimlig skorstenshöjd | excessive height of chimney stacks |
| orimlighet | absurdity |
| orimligt | unduly |
| orimligt pris | usurious price |
| Orinoco | Orinoco |
| Orinocokrokodil | Orinoco Crocodile |
| Orio al Serio International Airport | Orio al Serio Airport |
| Orion | Orion |
| Orion CEV | Orion |
| Orionarmen | Orion Arm |
| Orionnebulosan | Orion Nebula |
| Orissa | Orissa |
| Oristano | Province of Oristano |
| Orjol | Oryol |
| Orjol oblast | Oryol Oblast |
| ork | energy |
| orka | be able to |
| orkan | hurricane |
| Orkanen Allen | Hurricane Allen |
| Orkanen Camille | Hurricane Camille |
| Orkanen Charley | Hurricane Charley |
| Orkanen Dean | Hurricane Dean |
| Orkanen Emily | Hurricane Emily |
| Orkanen Felix | Hurricane Felix |
| Orkanen Gilbert | Hurricane Gilbert |
| Orkanen Gudrun | Erwin |
| Orkanen Humberto | Hurricane Humberto |
| Orkanen Ivan | Hurricane Ivan |
| Orkanen Jeanne | Hurricane Jeanne |
| Orkanen Katrina | Hurricane Katrina |
| Orkanen Linda | Hurricane Linda |
| Orkanen Lorenzo | Hurricane Lorenzo |
| Orkanen Mitch | Hurricane Mitch |
| Orkanen Rita | Hurricane Rita |
| Orkanen Stan | Hurricane Stan |
| Orkanen Wilma | Hurricane Wilma |
| Orkanens öga | Eye |
| Orkdal kommun | Orkdal |
| orkeslös | infirm |
| orkester | band |
| orkester- | orchestral |
| orkesterdike | orchestra pit |
| orkestrera | orchestrate |
| orkestrering | orchestration |
| Orkhonskrift | Orkhon script |
| orkidé | orchid |
| Orkidébauhinia | Bauhinia variegata |
| Orkidéer | Orchidaceae |
| Orkla | Orklaelva |
| Orkneyinga saga | Orkneyinga saga |
| Orkneyöarna | Orkneys |
| Orkneyöarnas flagga | Flag of Orkney |
| Orkut | Orkut |
| Orlando | Orlando |
| Orlando Bloom | Orlando Bloom |
| Orlando di Lasso | Orlande de Lassus |
| Orlando Magic | Orlando Magic |
| Orleans County | Orleans County |
