This paper attempts to understand selective engagement in corporate social responsibility (CSR). CSR involves various issues that can meet demands from multiple stakeholders. A firm can focus on certain CSR issues to satisfy a particular stakeholder while ignoring the demands from other stakeholders, or it can take a more balanced approach to CSR by addressing a wider range of social issues. In this paper, I investigate how stakeholder pressures from three types of primary stakeholders (customer, supplier, and employee) shape selective engagement in CSR. The empirical results based on a representative sample of more than 1,000 small and medium-sized enterprises (SMEs) in the early 2000s suggest that firms prioritize their stakeholders based on instrumental considerations. Those stakeholders who have greater power over the focal firm will exert a larger impact on a firm’s CSR engagement. Constrained by limited managerial resources, firms accord attention to a limited range of issues most relevant to salient stakeholders. Specifically, MNCs as major customers pressure the focal firm to assume more responsibility for product quality, as well as on a wider range of social issues; SOEs as both major customers and major suppliers pressure the focal firm to assume more responsibility for employee welfare; employees with higher education pressure the focal firm to assume more responsibility for employee welfare, and for a wider range of social issues. This study contributes to stakeholder theory and research on the CSR of SMEs, and has important implications for CSR practitioners.