Some researchers have argued that firms with favorable environmental performance are more likely to provide voluntary environmental disclosure, while others have argued that firms with poor environmental performance are most likely to disclose. The authors propose a curvilinear relation between environmental performance and environmental disclosure that is moderated by visibility. Data were obtained from S&P 500 firms queried by the Ceres’ Climate Disclosure Project. Results show a U-shaped environmental performance–environmental disclosure relation and a main effect for visibility, but no moderating effect for visibility on the U-shaped environmental performance–environmental disclosure rela- tion. The authors discussed the implications of these results for future research and practice.