BioEcoOcean (2024-2027) is a Horizon Europe project with the goal of creating a Blueprint for Integrated Ocean Science (BIOS). This tool will revolutionize biological and ecosystem ocean observation, enhancing understanding and sustainable ocean management. BIOS will guide every stage of ocean observation, from planning and data collection to policy applications. The project also advances state-of-the-art research on Biology and Ecosystems Essential Ocean Variables (EOVs), improving global data monitoring, management, and forecasting capabilities. BioEcoOcean aims to support local, European, and global scales in achieving better-informed decisions for sustainable ocean development.