The EOSC Strategic Implementation Plan presents the activities that will contribute to the implementation of the EOSC for the period 2019-2020. While the document will be made public after final approval, it is primarily intended for use by stakeholders engaged into building EOSC. Other documents will be developed and made public for use by research communities which will be the primary users of EOSC capabilities. This document draws from the EOSC Implementation Roadmap adopted by the Commission on 14 March 2018 and presents a comprehensive overview of the implementation of the EOSC, with action lines and timelines for the period 2019-2020. The list of activities includes the most recently approved Horizon 2020 projects.