The business judgment rule (BJR) is a U.S. corporate law concept that has gained international recognition. It has been moulded, particularly in the definition of the Delaware courts, to protect the managerial business discretion, in other words to protect directors’ decisions from judicial review. Corporate social responsibility (CSR) questions the relationship between corporation with a business purpose and society. More and more attention is drawn to the various impacts of corporate decisions on society, asking for the necessity for directors to take these impacts into consideration when making business decisions. At the centre of CSR and the BJR are the fiduciary duties of the directors — the duty of diligence and the duty of care — and the question as to if the directors have breached their duties and if they have fulfilled them in a CSR compatible manner. This paper discusses how the BJR helps promoting CSR by discussing the advantages and disadvantages (real or apparent) of the BJR with respect to CSR.