UNIONS SCIENTIFIQUES INTERNATIONALES MEMBRES DE L'ICSU/ISC
- International Astronomical Union (IAU)
- Union Radio Scientifique Internationale (URSI)
- International Geographical Union (IGU)
- International Society for Photogrammetry and Remote Sensing (ISPRS)
- International Union for QUAternary Research (INQUA)
- International Union of Crystallography (IUCr)
- International Union of Forest Research Organizations (IUFRO)
- International Union of Geodesy and Geophysics (IUGG)
- International Union of Geological Sciences (IUGS)
- International Union of Soil Sciences (IUSS)
- International Mathematical Union (IMU)
- International Union of Pure and Applied Physics (IUPAP)
- International Union of Pure and Applied Chemistry (IUPAC)
- International Union of Theoretical and Applied Mechanics (IUTAM)
- International Union of Materials Research Societies (IUMRS)
- International Brain Research Organization (IBRO)
: non membre de l'ISC en 2021
- International Union of Biochemistry and Molecular Biology (IUBMB)
- International Union of Biological Sciences (IUBS)
- International Union of Immunological Societies (IUIS)
- International Union of Microbiological Societies (IUMS)
- International Union of Nutritional Sciences (IUNS)
- International Union for Pure and Applied Biophysics (IUPAB)
- International Union for Physical and Engineering Sciences in Medicine (IUPESM)
- International Union of Basic and Clinical Pharmacology (IUPHAR)
- International Union of Physiological Sciences (IUPS)
- International Union of Toxicology (IUTOX)
- International Union of Food Science and Technology (IUFoST)
- International Union of Anthropological and Ethnological Sciences (IUAES): non membre de l'ISC en 2021
- International Union of Psychological Science (IUPsyST)
- International Union of History and Philosophy of Science and Technology (IUHPS)