- OASE, National University of Tainan, Taiwan
- ONERA - The French Aerospace Lab [Palaiseau]
- ONERA - The French Aerospace Lab [Toulouse]
- Ontario Research Center for Computer Algebra
- Optimisation, Simulation, Risque et Statistiques pour les Marchés de l’Energie
- Orange Labs [Belfort]
- Orange Labs [Chatillon]