Concepts and theories of corporate social responsibility (CSR) have been examined and classified by scholars since the mid-1970s. However, owing to the evolving meaning of CSR and the huge number of scholars who have begun to analyze the issue in recent years fresh efforts are needed to understand new developments. Since there is a great heterogeneity of theories and approaches, the task remains a very hard one, mainly because heterogeneity derives from multi-disciplinary diversity. The criterion for selection is to consider the role that theorists confer to the firm. Following this idea, three groups of theories have been discerned: (1) the utilitarian group, in which the corporation is intended as a maximizing 'black box' where problems of externalities and social costs emerge; (2) the managerial category, where problems of responsibility are approached from inside the firm (internal perspective); (3) relational theories, or those in which the type of relations between the firm and the environment are at the center of the analysis. The three perspectives allow the reader to understand the most significant differences between the various theories of CSR. The objective is to classify the theories and to draw a map in which group specificities can be made available. This allows scholars to reach a better understanding of corporate-society relations, and enhances developments both in theoretical and empirical terms.