The EOSC Ocean & Waters Node aims at further developing and integrating the current EOSC candidate marine thematic node into the operational thematic node for marine research within the EOSC Federation, providing researchers an EOSC compliant digital environment with access to core computing capabilities (Authentication, Authorisation and Accounting, Research Catalogues and Knowledge Graph, Application Workflows, Monitoring and Helpdesk), coupled with multidisciplinary datasets and workflows from in- situ and earth observations, models, analytical tools/services, essential for responding to the needs and objectives defined by the EC Mission “Restoring our Ocean and Waters by 2030”. The EOSC Ocean & Waters Node directly builds upon the achievements from the Blue-Cloud 2026 project and the EU initiated and funded EDITO programme that is building EDITO as the core infrastructure for the European Digital Twin of the Ocean.