Background The Austrian Presidency and the European Commission invite stakeholders from all Member States to celebrate the launch of the European Open Science Cloud (EOSC). The launch event on 23 November 2018 marks the conclusion of a long process of consultation and reflection with stakeholders and is a symbolic start for the EOSC. Declaration The Vienna Declaration on the European Open Science Cloud Governance Structure summarizes the consultation process by highlighting most important steps and by reminding the commitments, agreed upon by the Member States in the format of various policy documents. It also emphasizes the need to actively support this joint effort to ensure smooth and successful implementation. The Declaration will be approved by acclamation at the event. Governance Framework The newly appointed representatives of both Governance Board and Executive Board will present the Governance Structure of the EOSC. EOSC Portal The first version of the EOSC Portal, the entry point of the Cloud, will be demonstrated and its functionalities explained. Once up and running, the EOSC will offer Europe's 1.7 million researchers and 70 million science and technology professionals a platform to store, share and re-use their data across disciplines and borders. hdl:11353/10.918650 https://phaidra.univie.ac.at/o:918650 The European Open Science Cloud: Launch event Ganguly, Raman Collection eng