In this paper, we explore the relationship between firm growth and corporate social responsibility (CSR). Researchers often argue that firm growth offers greater opportunities and resources for firms to invest in CSR. Yet, we argue the opposite: firm growth consumes scarce financial and attentional resources, which are also needed for CSR. Firm growth, therefore, is negatively related to CSR. We probe the mechanisms for this relationship by exploring how the level of financial and attentional resources moderate the relationship between firm growth and CSR. We test this relationship by analyzing data from 4,305 firms over 2002 to 2020 across 46 countries, providing support for these ideas. This study offers important implications to research in business strategy, managerial attention, and CSR.