| OAU | Organisation of African Unity |
| oavbruten | uninterrupted |
| oavbrutet | continuously |
| oavbrutet sammanhang | continuity |
| oavgjord | drawn |
| oavgjord match | draw |
| oavgjort resultat | tie |
| Oavgörbar | Independence |
| oavhängig | independent |
| oavhängighet | sovereignty |
| Oavhängighet -en | Freedom |
| oavkortad | complete |
| oavlåten | incessant |
| oavlåtlig | unremitting |
| oavlåtligt | continuously |
| oavlönad | honorary |
| oavsett | irrespective of |
| oavsiktlig | unwitting |
| oavsiktligen | accidentally |
| oavsiktligt | involuntarily |
| oavslutad | unfinished |
| Oaxaca | Oaxaca |
| Ob | Ob River |
| Ob-ugriska språk | Ob-Ugric languages |
| Obadja | Book of Obadiah |
| obalans | imbalance |
| obalanserad | unbalanced |
| obanad | untrodden |
| obarmhärtig | relentless |
| obarmhärtighet | cruelty |
| obarmhärtigt | relentlessly |
| Obbnäs | Upinniemi |
| Obbá | Oba |
| obducera | dissect |
| obduktion | inquest |
| obearbetad | crude |
| obebodd | deserted |
| obeboelig | uninhabitable |
| obebolig | uninhabitable |
| obebyggd | undeveloped |
| obedd | unbidden |
| obefintlig | absent |
| obefintlighet | nonexistence |
| obefläckad | immaculate |
| Obefläckade Avlelse | Immaculate Conception |
| obefläckade avlelsen | Immaculate Conception |
| obefogad | unnecessary |
| obegagnad | unused |
| obegriplig | incomprehensible |
| obegripligt pladder | jabberwock |
| obegränsad | ceaseless |
| obegränsat | unlimited |
| obegåvad | brainless |
| obehag | uneasiness |
| obehaglig | unpleasant |
| obehaglig situation | plight |
| obehaglig till mods | uncomfortable |
| obehaglighet | distastefulness |
| obehandlat vatten | raw water |
| obehindrad | clear |
| obehärskad | unrestrained |
| obehärskat | uncontrollably |
| obehörig | unauthorized |
| obehövligt | unneeded |
| obekant | stranger |
| obekräftad | unconfirmed |
| obekväm | uneasy |
| obekvämlighet | inconvenience |
| obekymrad | heedless |
