The OECD’s Development Assistance Committee (DAC) conducts peer reviews of individual members once every five to six years. Reviews seek to improve the quality and effectiveness of members’ development co-operation, highlighting good practices and recommending improvements. Spain has put the 2030 Agenda at the centre of its foreign policy and development co-operation. It works in alliances to reach the Sustainable Development Goals, internationally and in partner countries. Spain is valued for its work in horizontal and inclusive partnerships, and its ability to mobilise public sector expertise to capture and share knowledge. As Spain embarks on a comprehensive reform of its development co-operation strategy and architecture, this peer review provides a set of recommendations to improve strategic steering, streamline its administrative framework, strengthen human resources and fully mobilise its financial co-operation.