Affiliations with the Letter A
- Aalborg University Hospital -- Denmark
- Aalto University -- Finland
- Aarhus Oliefabrik A/S -- Denmark
- Aarhus University -- Denmark
- Abo Akademi University -- Finland
- Academia Sinica -- China
- Academia Sinica -- Taiwan
- Academic Software -- United Kingdom
- Academy of Sciences of the Czech Republic -- Czech Republic
- Accutest Proficiency Testing Services, Inc -- United States
- ACE Environmental Health and Safety -- China
- Acid Deposition & Oxidant Research Center (ADORC) -- Japan
- Acta Farmacéutica Bonaerense -- Argentina
- Addis Ababa University -- Ethiopia
- Advanced Chemistry Development -- Russia
- Aerodyne Research, Inc. -- United States
- African Academy of Sciences -- Kenya
- AGH University of Science & Technology -- Poland
- Agricultural Production Systems Research Unit -- Australia
- Agriculture and Agri-Food Canada -- Canada
- AgriSuccess Consulting -- Brazil
- Agroformosa Technology Co., Ltd. -- Taiwan
- Ahuja Consulting -- United States
- Aichi Institute of Technology -- Japan
- Ain Shams University -- Egypt
- AIST Tsukuba Central -- Japan
- Akademie ved Ceské Republiky -- Czech Republic
- AKC Consulting Pty., Ltd. -- Australia
- Akzo Nobel Polymer Chemicals -- Netherlands
- Akzo Nobel Research & Technology -- Netherlands