The national committees

Astronomy (IAU)
Biology (IUBS)
Biosciences (IUMS, IUBMB, FEBS, FEMS, IUPAB)
Brain research (FENS, IBRO, EBRA)
Chemistry (IUPAC, EFCE, EFB, EuCheMs)
Climate research (WCRP)
Crystallography (IUCr)
Economics (IEA)
Geodesy-geophysics (IUGG, SCOSTEP)
Geography (IGU)
Geology (IUGS)
Global change research (IGBP, SCOPE)
Global change research, human dimension (IHDP)
History of science and technology (IUHPS/DHST)
Immunology (SSI)
Lithosphere research (ILP)
Mathematics (IMU)
Mathematical instruction (ICMI)
Mechanics (IUTAM)
Nutritional science (IUNS, FENS)
Oceanic research (SCOR)
Optics (ICO)
Pharmacology (IUPHAR, EPHAR)
Philosophy of science (IUHPS/DLMPS)
Physics (IUPAB)
Physiology (IUPS, FEPS)
Polar research (SCAR, IASC)
Psychology (IUPSys)
Quaternary research (INQUA)
Radio science (URSI)
Soil sciences (IUSS)
Space research (COSPAR)
Toxicology (IUTOX, EUROTOX)