| Object-oriented programming | Objekgeoriënteerde programmering |
| oblast | oblast |
| obligation | plig |
| oblique | skeef |
| oboe | hobo |
| observation | opmerking |
| obstacle | belemmering |
| obstruction | belemmering |
| obtain | behaal |
| occasion | gebeurtenis |
| Occitan | Oksitaans |
| occult | okkultisme |
| occupation | beroep |
| occur | gebeur |
| occurence | gebeurtenis |
| ocean | oseaan |
| Oceania | Oseanië |
| October | Oktober |
| octopus | seekat |
| odd | eienaardig |
| Odessa | Odessa |
| odor | geur |
| odour | geur |
| of course | natuurlik |
| of noble birth | edel |
