Fourth RDA Europe Science Workshop: The opportunities and challenges of open data for research London, UK, 25-26 April, 2017 This report summarizes the outcomes of the RDA Europe 2017 Science Workshop, which was organised by the RDA Europe team in collaboration with the Wellcome Trust at the Wellcome Trust Headquarters in London, UK, 25-26 April 2017. The participants were selected from a range of disciplines, with a mix of experts involved in data sharing, scientific practitioners who were actively engaged with collecting and exploiting data, and researchers who were studying the field of research data sharing from the perspectives of their own particular disciplines.