Corporate social responsibility (CSR) has become an area of increasing importance for many companies. Professional sport teams, also, are increasingly engaging in socially responsible activities (Irwin, Lachowetz, Cornwell, & Clark, 2003;Kern, 2000;Robinson, 2005). The research described in this article identifies, and determines the relative importance of, the drivers-both internal and external-of socially responsible activities by professional sport teams. Using a qualitative approach, interviews were conducted with sport executives, and organizational documents were analyzed. The data showed that external drivers of CSR, in particular key constituents, the interconnectedness of the field, and pressures from the league were more important determinants of CSR initiatives than the internal resources available to deliver CSR efforts (i.e., attention, media access, celebrity players, coaches, facilities). Based on these preliminary findings, we propose a framework of CSR adoption in professional sport that predicts the types of CSR initiatives a sport organization is likely to adopt depending on its internal and/or external orientation and present a research agenda based on the framework.Corporate social responsibility (CSR) has received considerable attention in the academic literature as the role that CSR plays in business has grown. The focus of academic research has been on identifying the link between financial and social performance (Margolis & Walsh, 2003). While the evidence of this relationship remains unclear, it does point to a positive association. Rather than continuing to focus on the financial-social performance relationship, Margolis and Walsh (2003) argued that researchers should shift their lenses and focus on the context, processes, and outcomes of CSR. This article follows this call by exploring contextual forces, internal and external to the firm, that lead organizations to become more socially responsible. Using an inductive research approach, we found Oliver's (1991) The purpose of this article is to explore and prioritize the forces that result in professional sport organizations engaging in CSR activities. By doing so, we hope to contribute to our understanding of the diffusion of this phenomenon such that it will be well grounded for future research. In addition, we explore the relationship among the determinants of CSR in sport and how they are related to the type of CSR initiatives that are adopted. The article is organized as follows, we: (1) present a brief overview of relevant aspects of the CSR literature; (2) highlight some socially responsible initiatives undertaken by professional sport organizations; (3) address what is unique about the sport industry, as it relates to CSR; (4) present preliminary research concerning the substantial diffusion of CSR in professional sport; (5) propose a determinants of CSR adoption in professional sport framework; and (6) present a research agenda that builds on the proposed framework. Next, we provide an overview of relevant elements of the CSR...