| oscillator | oscillator |
| oscillera | oscillate |
| oscillerande | oscillatory |
| Osco | Osco |
| OSE | Organismós Sidirodrómon Elládos |
| Osebergskeppet | Oseberg ship |
| Osebergsskeppet | Oseberg ship |
| osedlig | indecent |
| osedlighet | vice |
| osedvanlig | unusual |
| oseedad | unseeded |
| Osella | Osella |
| Osen kommun | Osen |
| Osgiliath | Osgiliath |
| Oshare kei | Oshare kei |
| Osho | Osho |
| Oshun | Oshun |
| OSI | Open systems interconnect |
| OSI-modellen | OSI model |
| Osijek | Osijek |
| osiktat mjöl | wholemeal |
| Osilnica | Osilnica |
| Osip Mandelstam | Osip Mandelstam |
| Osiris | Osiris |
| osjälvisk | altruistic |
| osjälvisk kvinna | altruist |
| osjälvisk man | altruist |
| osjälviskt | considerately |
| Osjälvständig personlighetsstörning | Dependent personality disorder |
| oskadad | scot-free |
| oskadd | safe |
| oskadlig | harmless |
| oskadlig för miljön | environment-friendly |
| oskalat ris | paddy |
| Oskar | Oscar |
| Oskar Dirlewanger | Oskar Dirlewanger |
| Oskar Klein | Oskar Klein |
| Oskar Kokoschka | Oskar Kokoschka |
| Oskar Lafontaine | Oskar Lafontaine |
| Oskar Schindler | Oskar Schindler |
| Oskar-Helene-Heim | Oskar-Helene-Heim |
| Oskarshamn | Oskarshamn Municipality |
| Oskarshamns kommun | Oskarshamn Municipality |
| Oskarshamns kärnkraftverk | Oskarshamn Nuclear Power Plant |
| Oskarshamnsverkets Kraftgrupp AB | Oskarshamn Nuclear Power Plant |
| oskattbar | valuable |
| Osker | Osci |
| oskicklig | awkward |
| oskiljaktig | inseparable |
| Oskiska | Oscan language |
| oskodd | shoeless |
| oskriven | unwritten |
| oskriven lag | unwritten law |
| oskrymtad | sincere |
| oskulation | osculation |
