- Aalborg University [Denmark]
- Aarhus University [Aarhus]
- Abdelmalek Essaadi University [Tétouan] = Université Abdelmalek Essaadi [Tétouan]
- Abdou Moumouni University of Niamey = Université Abdou Moumouni de Niamey
- Abdus Salam International Centre for Theoretical Physics [Trieste]
- Aberystwyth University
- Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie
- Academia Sinica
- Academica Sinica
- Academy of Scientific and Innovative Research [Ghaziabad, India]
- Acadia University
- ACEEE
- acri
- ACRI
- Adaptation agroécologique et innovation variétale
- Adaptation et diversité en milieu marin
- Adaptations et évolution des systèmes ostéomusculaires
- Addis Ababa University
- Aeronautical Technology Directorate [Japan]
- African Insect Science for Food and Health
- African Plant Nutrition Institute UM6P Experimental Farm
- Agence Française pour la Biodiversité
- Agence nationale de la Météorologie du Burkina Faso
- Agence Nationale de l’Aviation Civile et de la Météorologie
- Agence pour la sécurité de la navigation aérienne en Afrique et à Madagascar
- Agence Spatiale Algérienne = Algerian Space Agency
- Agence Spatiale Européenne = European Space Agency
- Agencia Estatal de Meteorología
- Agencia Nacional de Águas
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile
- Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile = Italian National Agency for New Technologies, Energy and Sustainable Economic Development
- Agricultural Information Institute
- Agricultural Research Council
- Agricultural Research, Education and Extension Organisation
- Agriculture and Agri-Food
- Agriculture Land-Use Planning Center
- AGROCAMPUS OUEST
- Agroclim
- Agroécologie [Dijon]
- Agroécologie et intensification durables des cultures annuelles
- AgroParisTech
- AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement
- Agrosystèmes Biodiversifiés
- Airbus Defence and Space Ltd [Portsmouth]
- Airbus Defence and Space [Toulouse]
- Airbus [France]
- Airbus Group [Germany]
- Air-Sea Interaction and Remote Sensing Department
- AirSea Laboratory, School of Physics and Ryan Institute
- Aix Marseille Université
- Akita University
- Akvaplan niva AS (APN) [Norway]
- Akvaplan-Niva [Tromsø]
- Alaska Fisheries Science Center
- Albert-Ludwigs-Universität Freiburg = University of Freiburg
- Albrecht-von-Haller-Institute for Plant Sciences
- Alcen SEAMAR (Alcen)
- Alfred Wegener Institute, Bremerhaven
- Alfred Wegener Institute for Polar and Marine Research
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
- Alfred Wegener Institute [Potsdam]
- Alfred Wegener Institute, Van Ronzelen Str. 2, 27568 Bremerhaven
- Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine
- Alianza Bioversity–CIAT
- Alma Mater Studiorum Università di Bologna = University of Bologna
- Alnilam Investigación y Conservación
- ALTRAN (FRANCE)
- Altran Ouest, Atlantide
- ALTRAN OUEST-ATLANTIDE
- Amélioration génétique et adaptation des plantes méditerranéennes et tropicales
- Aménagement des Usages des Ressources et des Espaces marins et littoraux - Centre de droit et d'économie de la mer
- American Museum of Natural History [New York, USA] = Musée américain d'histoire naturelle [New York, USA]
- American University of Beirut [Beyrouth]
- American University of Science and Technology
- American University Washington D.C.
- A.M.Obukhov Institute of Atmospheric Physics
- Amphitrite
- Amundsen Science, Quebec
- Analyses des eaux, sols et végétaux
- Analytical and Environmental Chemistry and Earth System Sciences
- Analytical, Environmental and Geo- Chemistry
- Analytical, Environmental and Geo- Chemistry
- Analytic and Computational Research, Inc. - Earth Sciences
- Andhra University
- Andromède Océanologie
- Animal Demography Unit
- Animal, Santé, Territoires, Risques et Ecosystèmes
- ANSTO
- Antarctic Climate and Ecosystems Cooperative Research Centre
- Antarctic Climate & Ecosystem Cooperative Research Centre
- Antarctic Ecosystem Research Division
- Antarctic Research Trust
- Antarctic Wildlife Research Unit
- ANU College of Science [Canberra]
- Appalachian State University
- Application Laboratory
- Applied Geoscience Division
- Applied Physics Laboratory [Seattle]
- Applied Physics, School of Applied Sciences
- Approches Littéraires, Linguistiques et Historiques des Sources
- Appsilon Data for Good
- Aquarium des Lagons
- Aquarium tropical
- ARC Centre of Excellence for Climate Extremes
- ARC Centre of Excellence for Climate System Science
- ARC Centre of Excellence for Coral Reef Studies
- Archaeological Studies Program
- Archaeology Division
- Archéologie du Proche-Orient Hellénistique et Romain
- Archéologies et Sciences de l'Antiquité
- ARCHEORIENT - Environnements et sociétés de l'Orient ancien
- Archéozoologie, archéobotanique : sociétés, pratiques et environnements
- Archéozoologie, histoire des sociétés et des peuplements animaux
- Archie Carr Center for Sea Turtle Research
- Arctic and Antarctic Research Institute
- Arctic Frontiers AS
- Arctic Research Center [Sapporo]
- Arctic Research Centre
- ARGANS
- ARGANS Limited
- Argentine Antarctic Institute (IAA)
- Arizona Geological Survey
- ARPA Emilia-Romagna, Agenzia Regionale per la Protezione dell’Ambiente
- ARPA-SIM
- Array Systems
- Array Systems Computing
- Arts et Métiers Paristech ENSAM Aix-en-Provence
- Arts et Métiers Sciences et Technologies
- Asian School of the Environment
- Asociación CONSERVACCION
- Assistance Publique - Hôpitaux de Marseille
- Association Kwata
- Association of Caribbean States
- Association of Computer Electronics and Electrical Engineers (ACEEE)
- AstroParticule et Cosmologie
- Astrophysics and Geophysics Institute [Liège]
- Atlantide-Altran Ouest
- Atmosphere and Ocean Research Institute [Kashiwa-shi]
- Atmosphere and Ocean Research Institute, University of Tokyo
- ATMOSPHERE - LATMOS
- Atmospheric and Environmental Research, Inc.
- Atmospheric and Oceanic Sciences Program [Princeton]
- Atmospheric Chemistry Division [Boulder]
- Atmospheric Chemistry Observations and Modeling Laboratory
- Atos
- Austral Boréal
- Austral, Boréal et Carbone
- Australian Antarctic Division
- Australian Antarctic Division, Department of Agriculture [Australia]
- Australian Antarctic Division, Kingston, Tasmania, 7050, Australia
- Australian Bureau of Meteorology [Melbourne]
- Australian Centre for Ocean Resources and Security (ANCORS)
- Australian Government
- Australian Government, Department of the Environment and Energy
- Australian Institute of Marine Science
- Australian Institute of Marine Science [Perth]
- Australian Institute of Marine Science [Townsville]
- Australian Marine Mammal Centre
- Australian National University
- Australian Nuclear Science and Technology Organisation [Australie]
- Australian Research Council
- Australian Research Council [Canberra]
- Australian Rivers Institute
- Austrian Academy of Sciences
- Avant création Cerema
- Avignon Université
- Axe santé des populations et pratiques optimales en santé
- AZTI
- AZTI - Tecnalia
- AZTI Tecnalia
- AZTI-Tecnalia