IAG maintains liaisons to several scientific bodies and sends representatives to their steering committees. Here are the corresponding links.
Advisory Board on the Law of the Sea (ABLOS)
Group on Earth Observation (GEO)
ICSU Commission on Space Research (COSPAR)
IAU Commission A2 "Rotation of the Earth"
International Standards Organization (ISO)
Joint Board of Geospatial Information Societies (JBGIS)
United Nations Initiative on Global Geospatial Information Management (UN-GGIM)
United Nations Offices for Outer Space Affairs (UNOOSA)
UN Platform for Space-based Information for Disaster Management and Emergency Response (UN-SPIDER)