This study investigates the relations among Machiavellianism, the stakeholder orientation, and Italian managers' support for corporate social and environmental reporting (SER). These relationships have not previously been investigated among a sample of experienced managers but have important implications. As anticipated, Machiavellianism had a strong negative association with the support for SER. Machiavellianism was also negatively related to the stakeholder orientation, which in turn was positively correlated with the support for SER. Support for the stakeholder orientation partially mediated the association between Machiavellianism and SER. The findings advance our understanding of the motivations for sustainability reporting by documenting that managers' fundamental personality traits and economic ideologies are closely associated and are important determinants of normative support for social and environmental disclosures. We further suggest that the results support the case for mandated compliance-with-standard sustainability reports coupled with a requirement that such reports be independently audited.