- Oak Ridge National Laboratory [Oak Ridge]
- Oakland University
- Oberthur Technologies
- Objets communicants pour l'Internet du futur
- Ochanomizu University
- Okayama University of Science
- Old Dominion University [Norfolk]
- Open University of Israël
- Orange Labs
- Orange Labs [Caen]
- Orange Labs [Cesson-Sévigné]
- Orange Labs [Chatillon]
- Orange Labs [Issy les Moulineaux]
- Oregon State University
- Osaka University
- Ostfalia University of Applied Sciences
- Otto-von-Guericke-Universität Magdeburg = Otto-von-Guericke University [Magdeburg]
- Oxford Brookes University
- Oxford University Computing Laboratory
- Örebro University
- Örebro University School of Business