SeaDataNet is a pan-European distributed marine data infrastructure for the management, exchange and re-use of marine and oceanographic data sets. One of the objectives is to provide an overview of organisations active in the marine domain. This is set up as a directory that is supporting the other metadata directories (e.g CDI datasets information refers to the EDMO directory codes for the originator, dataholder, metadata provide, of the data). EDMO contains up-to-date addresses and activity profiles of research institutes, data holding centres, monitoring agencies, governmental and private organisations, that are in one way or another engaged in oceanographic and marine research activities, data information management and/or data acquisition activities. Currently, EDMO lists and describes more than 4.000 organisations. EDMO offers two interfaces, a regular HTML interface for human users and a SPARQL Endpoint for machine applications.For communities who need to have access to the main organisations active in the marine research domain, and communities that wish to adopt EDMO as a vocabulary/codelist.Used internally in Europe, the SeaDataNet community, as well as outside in Australia (AODN) and USA/Canada.