The concepts Circular Economy has become increasingly important in the last decade and this trend is likely to strengthen in the EU in the next years. The European recovery strategy from the Covid-19 emergency is based on the EU Green Deal, which is deeply connected to the New Circular Economy Action Plan adopted by the Commission in March 2020. In order to achieve a more Circular Economy, it is absolutely necessary to measure circularity both at the macro and at the company level. The report realized by Fondazione Eni Enrico Mattei aims to shed light on this issue by providing a critical review of some of the existing indicators measuring the Circular Economy.