| ordening | disposal |
| ordentelijk | orderly |
| order | order |
| Order of Merit | Order of Merit |
| orders geven aan | shove around |
| Ordes | Ordes |
| ordeverstoorder | heckler |
| ordeverstoorster | heckler |
| ordeverstoring | disturbance of the peace |
| ordinaal | ordinal |
| ordinair | everyday |
| Ordinarium | Ordinary of the Mass |
| ordinatie | ordination |
| ordineren | ordain |
| Ordino | Ordino |
| Ordizia | Ordizia |
| ordner | folder |
| Ordo Templi Orientis | Ordo Templi Orientis |
| ordonnansofficier | adjutant |
| ordonnantie | ordinance |
| Ordovicium | Ordovician |
| Ordoño I van Asturië | Ordoño I of Asturias |
| Ordoño II van León | Ordoño II of León |
| Ordoño III van León | Ordoño III of León |
| Ordu | Ordu Province |
| Orduspor | Orduspor |
| oregano | oregano |
| Oregon | Oregon |
| Oregon Country | Oregon Country |
| Oregon territorium | Oregon Territory |
| Oregon Trail | Oregon Trail |
| Oregonterritorium | Oregon Territory |
| Orel | Orel |
| Orellana | Orellana Province |
| Orenburg | Orenburg |
| Orenburg Airlines | Orenburg Airlines |
| Orendain | Orendain |
| oreren | declaim |
| Oresteia | The Oresteia |
| Orestes | Orestes |
| Orestie | The Oresteia |
| Orexa | Orexa |
| Orff-Schulwerk | Orff Schulwerk |
| Orfgen | Orfgen |
| orgaan | organ |
| Orgaan van Jacobson | Vomeronasal organ |
| Organel | Organelle |
| organiek | organic |
| Organisasi Papua Merdeka | Free Papua Movement |
| organisatie | setup |
| Organisatie van Afrikaanse Eenheid | Organisation of African Unity |
| Organisatie van Amerikaanse Staten | Organization of American States |
| Organisatie van de Islamitische Conferentie | Organization of the Islamic Conference |
| Organisatie van Ibero-Amerikaanse landen | Organization of Ibero-American States |
| Organisatie van Niet-gebonden Landen | Non-Aligned Movement |
| Organisatie van Werelderfgoedsteden | Organization of World Heritage Cities |
| Organisatie voor Economische Samenwerking en Ontwikkeling | Organisation for Economic Co-operation and Development |
| Organisatie voor het Verbod op Chemische Wapens | Organisation for the Prohibition of Chemical Weapons |
| Organisatie voor Veiligheid en Samenwerking in Europa | Organization for Security and Co-operation in Europe |
| Organisation Todt | Organisation Todt |
| organisator | organizer |
| organisator van revivals | revivalist |
| organisatorisch | organizational |
| organisatrice | organizer |
| organisatrice van revivals | revivalist |
