The Joint Action Towards the European Health Data Space (TEHDAS) is a consortium of 26 EU MS and other countries that work to improve cross-border use of health data for the benefit of citizens’ health, for public health, research and innovation.TEHDAS builds on earlier EU actions fostering the digital transformation of European health systems. It contributes to responding to the Member States’ call at the October 2020 European Council to set up a European Health Data Space and proposed by the von der Leyen Commission.The Joint Action helps Members States and the Commission in developing and promoting concepts for sharing of data so that in the future Europe, citizens, communities and companies benefit from a protected and seamless access to health data regardless where it is stored.TEHDAS will suggest options for an operational framework and governance in order to overcome legal and technical differences between countries. TEHDAS is grounded on the principles of transparency, trust and citizen empowerment. It will work on technical and semantic challenges, propose services, architectural and infrastructural elements required in the European Health Data Space.Citizens increasingly manage their data which requires a better understanding and a European perspective. To maintain trust in fair and secure data sharing, TEHDAS will suggest strengthened governance mechanisms for cross-sector use of health data in common data spaces at the EU and Member State levels.TEHDAS will reach out and engage with many types of stakeholders to reflect their needs and expectations, explore views on economic issues, and suggest concrete ways to integrate results into the future the European Health Data Space.