To seize the potential of Circular Economy (CE) organisations need to evaluate and communicate their progress moving away from the non-sustainable paradigm of ‘take-make-dispose’ towards circularity. Existing CE assessments for organisations focus on companies. Although the need for CE assessment is recognised in both public and private sectors, little progress has been made towards developing an approach for public sector organisations. CE assessment in public sector organisations is particularly important due to their role model, agenda setting and economic function. Therefore, this article co-develops a CE assessment framework for public sector organisations. Portuguese public sector organisations were involved as a participatory case st...