This first version of the EOSC Work Plan outlines the key outputs which will be delivered in this first phase of implementation. They comprise a first iteration of activities which will be handed over to a new governance structure at the end of 2020. The timelines, methods for delivery and key inputs are outlined in this document and run from mid-2019 until the end of 2020. This Work Plan will be updated periodically, at least in Q1 of 2020, but potentially more regularly if needed. This document draws from the EOSC Implementation Roadmap adopted by the Commission on 14 March 2018 and the EOSC Strategic Implementation Plan published in June 2019. The activities in the work plan include the most recently approved Horizon 2020 projects. This document has been reviewed and amended by the EOSC Executive Board in August 2019. It will be presented to the EOSC Governing Board during its 11th September 2019 meeting.