The European Open Science Cloud (EOSC) is to become a part of the ‘Web of FAIR data’ to be developed world-wide in order in due time to deliver services like offering access to data, publications and the essential software to speed up research findings and the developments based on these. By adhering to the FAIR principles and using an adequate AAI (Authentication and Authorisation Infrastructure) EOSC can be created to become a federated system within Europe for the benefit of the European users. For this development to take place the collaborative contributions of stakeholders at the Institutional, National and European level are needed. Libraries are essential partners in the creation of useful data infrastructures to build EOSC. In this presentation the role of the EOSC Association in this development will be explained.