This report considers basic drivers for shifting from a linear to a circular economy and the demand for related indicators. Major priorities in the circular economy are the decoupling of resource use and environmental impact from economic activities; measurement of resource efficiency and waste reduction, and tracking material flows is thus a key component. However, such basic concepts do not capture the environmental impact of resources extraction and use, or the objective of more efficiently using goods, including repairing and reusing. The report reviews in detail the indicators recently proposed in different fields and assesses their relevance for the circular economy. The indicator sets considered include those from the United Nations Environment Programme (UNEP), United Nations Development Programme (UNDP), Global Reporting Initiative, World Bank, Yale and Columbia Universities, Eurostat, Ellen MacArthur Foundation, European Union (EU) Resource Efficiency Scoreboard...