This paper explores the possible role of Open Science in the knowledge transfer between research and policy, focusing on its potential use by scientific councillors at Estonian ministries. Qualitative interviews with scientific councillors show that they perceive their role as intermediaries between research and policy and focus their work on improving the quality of research commissioned by their ministry. This process, for them, involves using existing academic articles and datasets to which, however, they lack official access. We show that Open Science can contribute to knowledge transfer if there are knowledge brokers in public sector organizations.