PurposeIn recent years, the role of environmental, social and governance (ESG) disclosure has become crucial. The aim of this paper is to study how corporate governance affects one part of ESG disclosure: anti-corruption disclosure.Design/methodology/approachThis study examined 140 corporate social responsibility (CSR) reports from companies listed on the Italian stock markets and 50 CSR reports from other companies, then this study analysed the adoption of the Global Reporting Initiative (GRI) standard no. 205.FindingsThe results show a low level of disclosure, and that corporate governance issues matter. In particular, the analysis found a positive relationship between the presence of female and outside members, the number of board members and the level of anti-corruption disclosure.Research limitations/implicationsThis study acknowledges some limitations. Firstly, the research is based on a one-year sample. Secondly, the research hypotheses are confirmed only when considered in relation to a single section of the GRI standards. Thirdly, this study has a bias towards relatively large enterprises.Practical implicationsIt could be worthwhile introducing a soft regulation regarding the composition of the board of directors that requires a certain quantitative and qualitative composition.Originality/valueTo the best of the authors’ knowledge, this is one of the few studies, the first in Italy, that sheds light on anti-corruption disclosure and its determinants.