The circular economy (CE) is increasingly being recognized as a viable alternative to the traditional linear model of production and consumption, which is now widely acknowledged as unsustainable. For these reasons, the academic literature has begun to take an interest in the way in which companies implement CE strategies in their business models and disseminate information regarding this new model of production and consumption. Specifically, scholars have begun to investigate the dissemination of CE information, but this area of research is still underexplored. In fact, there are only a few studies investigating the factors that influence the levels of CE disclosure (CED). In order to fill the knowledge gap, this study aims to examine the impact of national culture on CED levels. First, this study uses a manual content analysis to measure the amount of CE information disseminated in the sustainability reports of 81 international companies. Secondly, a linear regression model is used to test the impact of national culture on the CED. The results show adequate levels of CE information disclosed through sustainability reports. In addition, they demonstrate a negative impact of power distance and masculinity and a positive effect of uncertainty avoidance and long-term orientation on the CED. To the best of our knowledge, this is the first study to explore the influence of national culture on CED, addressing a gap in the literature at the intersection of cultural values and sustainability reporting practices. By highlighting how specific cultural dimensions shape firms’ disclosure behaviour, this study provides valuable insights for companies –seeking to align their reporting with stakeholder expectations – as well as for policymakers and training institutions, who aim to promote more effective and culturally sensitive sustainability frameworks.