The International Ocean Colour Coordinating Group (IOCCG) is an international committee of experts from national space agencies and the aquatic radiometry user community that promote the development and application of science and technology that underpin remote sensing of ocean colour across all aquatic environments: inland and coastal waters, and the open ocean.

IOCCG was established in 1996 under the Intergovernmental Oceanographic Commission (IOC) of UNESCO, following a resolution endorsed by the Committee on Earth Observation Satellites (CEOS). It is an affiliated project of the Scientific Committee on Oceanic Research (SCOR) and an associate member of CEOS.

IOCCG activities include coordination, training, liaison between space agency providers and scientific users, advocacy, and provision of expert advice. Objectives include developing global consensus and synthesis on satellite ocean colour radiometry (OCR), establishing specialised scientific working groups to investigate various aspects of ocean colour technology and its applications, and addressing continuity and consistency of ocean colour radiance datasets through the CEOS OCR-Virtual Constellation. IOCCG conducts and sponsors advanced ocean colour training opportunities in various countries around the world, and is the convenor of the International Ocean Colour Science (IOCS) meeting.

Activities are supported by national space agencies and organisations, and by infrastructure support from SCOR and the Bedford Institute of Oceanography (Department of Fisheries and Oceans, Canada) where the IOCCG Project Office is hosted.