Scholars have increasingly considered how to promote employee voluntary pro-environmental behavior (PEB) in the hospitality industry. This research explores the normative pathway underlying the relationship between perceived corporate social responsibility (CSR) and voluntary PEB among frontline service employees. Guided by social cognitive theory, we suggest that the relationship between perceived CSR and voluntary PEB is mediated by organizational commitment and that this indirect relationship is moderated by moral efficacy. Multisource data from employees and supervisors (N = 221 matched pairs) support our proposed moderated mediation relationship, such that moral efficacy strengthens the positive indirect effect of perceived CSR on voluntary PEB via organizational commitment. This study adds to the literature by providing insights and implications for future research on the emergence of voluntary PEB in the hospitality industry.