- APT – Asia-Pacific Telecommunity
- ASPG – Arab Spectrum Management Group
- CEPT – Conférence Européene des Postes et des Télécommunications
- CESRA – Community of European Solar Radio Astronomers
- CITEL – Inter-American Conference on Telecommunications
- COPUOS – UN Committee on Peaceful Uses of Outer Space
- CORF – Committee on Radio Frequencies (USA)
- COSPAR – Commission on Space Research
- ECO/ERO – Electronic Communications Office
- EC – IS – European Commission – Information Society (radio spectrum issues)
- EC – RSC – European Commission – Radio Spectrum Committee
- EC – RSPC – European Commission – Radio Spectrum Policy Group
- ESA – European Space Agency
- ESF – European Science Foundation
- ESTEC – European Space Research and Technology Centre
- ETSI – European Telecommunication Standards Institute
- EUMETNET – The Network of European Meteorological Services
- EUMETSAT – European Organisation for the Exploitation of Meteorological Satellites
- FCC – Federal Communications Commission (USA)
- ICSU – International Council for Science
- Industry Canada
- IAU – International Astronomical Union
- ITU – International Telecommunication Union
- IUCAF – Scientific Committee on the Allocation of Frequencies for Radio Astronomy and Space Science
- NASA – National Aeronautics and Space Administration
- NTIA – National Telecommunications and Information Administration (USA)
- PTC – Pacific Telecommunications Council
- RAFCAP – Radio Astronomy Frequency Committee in the Asia-Pacific Region
- RadioNet – Advanced Radio Astronomy in Europe
- SFCG – Space Frequency Coordination Group
- UNO – United Nations Organization
- URSI – Union Radio Scientifique International
Committee on Radio Astronomy Frequencies