- ONERA - The French Aerospace Lab [Châtillon]
- ONERA - The French Aerospace Lab [Palaiseau]
- ONERA | DTIS, Université de Toulouse [Toulouse]
- Occupational Health Unit
- Open Geospatial Consortium
- Open Wide
- Operations Research & Financial Engineering
- Optimisation des régulations physiologiques
- Optimisation des systèmes industriels et de services [Tunis]
- Orange Labs
- Orange Labs R&D [Rennes]
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