The EurOCEAN 2019 conference is an official contribution to the preparatory phase of the UN Decade of Ocean Science for Sustainable Development (2021-2030). It is an important initial step from the European marine science community to prepare for the UN Ocean Decade and to ensure that it aligns with the EU Framework Programmes. The EurOCEAN 2019 conference report documents the contributions and discussions that took place at the UNESCO headquarters in Paris, France on 11-12 June 2019. It also includes a brief summary with the main messages from the conference.