In response to global challenges related to resource scarcity and environmental concerns, the circular economy (CE) has emerged as a transformative model focused on resource efficiency and waste reduction. 

As the discourse around the CE intensifies, understanding the skill requirements of the CE becomes imperative for effective policy-making, workforce development, and regional competitiveness. 

This paper addresses the scarcity of quantitative methods on this aspect and proposes a conceptual and empirical framework to identify, analyse, and monitor the skill requirements of the CE through a comprehensive and reproducible approach based on relative skill advantage, skill relatedness, and skill complexity measures. 

Accordingly, it identifies the essential and complementary skills within the CE by constructing unique skill spaces and documents their regional variation.