There is a widely entertained, societal obligation on the part of scientific institutions to serve society with social impact and to engage citizens in research policy. While research on Public Engagement (PE) has mainly focused on scientists' engagement with the public, little attention has been paid to the institutional context in which public engagement occurs. OPEST – Organisational Public Engagement with Science and Technology examines how research institutions are engaging society in Portugal, the UK, Germany, Italy, the Netherlands and the US, China, Brasil and Japan. This project produced for the first time national representative studies of institutional responses to demands for public engagement in science and technology and mapped the activities performed and resources mobilised for engagement. We produced for the first time comparable data on institutional PE across countries with different academic, economic and social systems, as well as practices and traditions of public engagement with a view of understanding patterns and factors that mobilise engagement. The study addresses the gap in the literature on organisational PE and provides evidence on which research institutions can base workable systems to actively involve society, support policy makers in the development of policy actions to foster PE at national and international levels, and in the medium-term, contribute to engaging citizens in research and policy.