- Abdelhamid Ibn Badis University
- aDalian NationalLaboratoryforCleanEnergy
- Agence Spatiale Européenne = European Space Agency
- Agriculture et Agroalimentaire Canada
- AGROCAMPUS OUEST
- AgroParisTech
- Agrosystèmes tropicaux
- AIRBUS DS (Toulouse)
- Air Force Research Laboratory
- Air Liquide [Siège Social]
- Aix Marseille Université
- Alban Muller International
- Alexandru Ioan Cuza University of Iași = Universitatea Alexandru Ioan Cuza din Iași
- Alfven Laboratory
- AMEK
- Aramco Fuel Reseach Center
- ARC-Nucleart CEA Grenoble
- ARCYS
- Argonne National Laboratory [Lemont]
- ArianeGroup
- ARVALIS - Institut du végétal [Paris]
- Atmospheric Chemistry Department [Leipzig]
- Atmospheric Chemistry Department [MPIC]
- Atmospheric Chemistry Division [Boulder]
- Atmospheric Chemistry Services
- Atmospheric Chemistry Services, Okehampton, Devon, EX20 4QB, UK
- Atmospheric Chemistry Services [UK]
- Australian National University
- Autonomous University of San Luis Potosí
- AVL France
- A.V. Topchiev Institute of Petrochemical Synthesis
- Axe 2 : procédés de traitements de surface
- Axe 2 : procédés plasmas et lasers