We investigate the role of CSR managers in the process of institutionalizing CSR at the organizational level. From an institutional theory perspective, CSR managers can be regarded as pursuing institutional work that aims to establish CSR as a taken-for-granted way of doing business within and beyond a single organization. We investigate inductively what the day-to-day practices of CSR-related institutional work are that these CSR managers are carrying out. Our qualitative inquiry suggests a pattern of five distinct but interrelated strategies applied within organizational contexts. The data further indicate that the CSR-institutionalization project and corresponding institutional work of CSR managers cannot only be achieved by crafting formalized bureaucratic structures, but must be complemented by informal strategies of convincing, “subtly nudging” others, and forming “silent” alliances with like-minded supporters. While our study provides evidence of what institutional work in the context of CSR actually entails, it also contributes to a better understanding of the nascent micro-perspective on CSR.