| Organisation of Eastern Caribbean States | Organisation des États de la Caraïbe orientale |
| organisation of teaching | organisation de l'enseignement |
| organisation of the legal system | organisation de la justice |
| Organisation Todt | Organisation Todt |
| Organised crime | Crime organisé |
| organism | organisme |
| organist | organiste |
| Organizatio | Compagnie |
| organization | union |
| Organization for Security and Co-operation in Europe | Organisation pour la sécurité et la coopération en Europe |
| Organization of American States | Organisation des États américains |
| Organization of the Black Sea Economic Cooperation | Coopération économique de la mer Noire |
| Organization of the Islamic Conference | Organisation de la conférence islamique |
| Organization of Ukrainian Nationalists | Organisation des nationalistes ukrainiens |
| Organization of World Heritage Cities | Organisation des villes du patrimoine mondial |
| organizational | d'organisation |
| Organizational memory | Mémoire |
| Organizational studies | Théorie des organisations |
| organize | arranger |
| organized | organisé |
| organized crime | grand banditisme |
| organizer | organisateur |
| organochlorine compound | composé organochloré |
| organohalogen compound | composé organohalogèné |
| organoleptic property | propriété organoleptique |
| organometallic compound | composé organométallique |
| Organon International | Organon BioSciences |
| organonitrogen compound | composé organique azoté |
| organooxygen compound | composé organique oxygéné |
| organophosphorous compound | composé organophosphoré |
| organosulphur compound | composé organosulfuré |
| Organotroph | Organotrophie |
| organs of reproduction | organes de reproduction |
| Organum | Organum |
| orgasm | orgasme |
| Orgasmatron | Orgasmotron |
