Since its creation, CETMO has been a permanent observer of the United Nations through the UNECE (United Nations Economic Commission for Europe). CETMO has also been recognized as a UNECE-linked centre since 1988.
CETMO participates actively on the Inland Transport Committee (ITC) and specific working groups. CETMO issues regular reports on the status of transport infrastructure and services in the Western Mediterranean.
Within the framework of the ITC, CETMO makes recommendations for action to improve infrastructure and transport development.
In 2018, CETMO and UNECE signed a Memorandum of Understanding to strengthen cooperation to boost intermodal transport in Western Mediterranean.