Category 1

-> International Arctic Social Sciences Association (IASSA)

-> International Association of Legal Science (IALS)

-> International Astronomical Union (IAU)

-> International Cartographic Association (ICA)

-> International Commission for Optics (ICO)

-> International Commission on Illumination (CIE)

-> International Council for Industrial and Applied Mathematics (ICIAM)

-> International Federation of Societies for Microscopy (IFSM)

-> International Geographical Union (IGU)

-> International Mathematical Union (IMU)

-> International Peace Research Association (IPRA)

-> International Political Science Association (IPSA)

-> International Society for Photogrammetry and Remote Sensing (ISPRS)

-> International Sociological Association (ISA)

-> International Union for Physical and Engineering Sciences in Medicine (IUPESM)

-> International Union for Pure and Applied Biophysics (IUPAB)

-> International Union for Quaternary Research (INQUA)

-> International Union for the Scientific Study of Population (IUSSP)

-> International Union of Basic and Clinical Pharmacology (IUPHAR)

-> International Union of Biochemistry and Molecular Biology (IUBMB)

-> International Union of Biological Sciences (IUBS)

-> International Union of Crystallography (IUCr)

-> International Union of Food Science and Technology (IUFoST)

-> International Union of Forest Research Organizations (IUFRO)

-> International Union of Geodesy and Geophysics (IUGG)

-> International Union of Geological Sciences (IUGS)

-> International Union of History and Philosophy of Science and Technology (IUHPST)

-> International Union of Immunological Societies (IUIS)

-> International Union of Materials Research Societies (IUMRS)

-> International Union of Microbiological Societies (IUMS)

-> International Union of Nutritional Sciences (IUNS)

-> International Union of Physiological Sciences (IUPS)

-> International Union of Psychological Science (IUPsyS)

-> International Union of Pure and Applied Chemistry (IUPAC)

-> International Union of Pure and Applied Physics (IUPAP)

-> International Union of Radio Science (URSI)

-> International Union of Soil Sciences (IUSS)

-> International Union of Speleology (UIS)

-> International Union of Theoretical and Applied Mechanics (IUTAM)

-> International Union of Toxicology (IUTOX)

-> Society for Social Studies of Science (4S)

-> World Anthropological Union (WAU)

-> World Association for Public Opinion Research (WAPOR)