Corporate social responsibility (CSR) is a relatively undeveloped concept despite its increasing importance to corporations. One difficulty is the possible inexactness of CSR. Another is the apparent reluctance by regulatory authorities and policy makers to intervene in the area. This is largely a result of inhibitions created by traditional approaches to company law with emphasis on shareholder protection and financial disclosure. The consequence is the stultification of independent development of CSR by tying social issues to financial performance. This attitude might (...) not be unconnected to the theoretical and practical challenges in justifying CSR and defining its scope. The underlying impediment is a factual and theoretical failure to distinguish ‘instrumental’ and ‘pure’ (ethical) CSR. This article demonstrates that ethical CSR highlights the role of regulation, and a principal stance is that regulation is neither incompatible nor irreconcilable with ethical CSR. The article argues that cognizance of the intrinsic moral justification of ‘pure’ CSR is required for delineating the scope of CSR as well as for clarifying the desirability and extent of its regulation. It argues that the dynamic history and visage of multinational corporate corruption illuminates the fluidity of the regulation–CSR relationship. The current and widening backlash against transnational corporate corruption is, arguably, a demonstration of the position that regulation and CSR are not mutually exclusive and absolute concepts. This article submits that recognition and application of this ‘ethical’ and ‘instrumental’ CSR distinction is fundamental to the development of CSR and resolution of connected questions of regulation. (shrink)