RDA TIGER, a Horizon Europe-funded project, supports the international engagement and alignment of policies, technologies, methodologies, practices and other outputs relating to EOSC and European Open Science developments more generally. As key stakeholders in facilitating and supporting Open Science, research libraries play a vital role in managing and sharing research data, making RDA TIGER’s services especially impactful for their mission. This poster will outline how RDA TIGER can equip research libraries to actively contribute to and benefit from the EOSC by: Enhancing RDM Services: Supporting libraries in adopting and implementing RDA Outputs and Recommendations to improve metadata curation, and FAIR data practices. Fostering Interoperability: Highlight and promote RDA WGs that provide semantic tools, frameworks, and standards that enable libraries to support seamless data sharing and reuse within and across disciplines, ensuring alignment with EOSC requirements. Sustaining Knowledge and Tools: Ensuring the long-term accessibility and relevance of community-driven solutions, allowing libraries to offer sustainable services that meet evolving research needs. Research libraries are ideally positioned to act as intermediaries between researchers and EOSC. By leveraging RDA TIGER’s outputs, services and solutions, research libraries can: Implement harmonised data and metadata standards to improve discoverability and interoperability. Facilitate cross-disciplinary research by connecting domain-specific practices with EOSC-wide frameworks. Serve as hubs for disseminating and integrating Open Science tools and practices within their institutions. As the EOSC ecosystem evolves, research libraries must continue to adapt and expand their roles. RDA TIGER empowers libraries to meet these demands, ensuring they remain at the forefront of Open Science by providing the tools, networks, and frameworks necessary to thrive in a collaborative, data-driven research environment. This poster aims to demonstrate how the RDA TIGER project can support the research library community by showcasing use cases where RDA TIGER-supported RDA Working Groups have developed outputs and solutions that empower research libraries to address challenges and drive innovation. It highlights frameworks such as the GORC (Global Open Research Commons) model, the MaLDReTH model (Mapping the Landscape of Digital Research Tools Harmonised), and work to facilitate the adoption of the TRUST Principles by repositories as key examples of these contributions and their relevance to research libraries.