With this letter of support, GEOMAR Helmholtz Centre for Ocean Re-search Kiel, Germany, would like to express its commitment to join the UNEP Global Mercury Partnership. GEOMAR explores the global ocean from the seafloor to the atmosphere to understand the ocean system and to enable the development of sustainable solutions to pressing societal issues. With our research and our commitment to transfer of knowledge and technology, we contribute to preserving the function of the ocean and safeguarding it for future generations.