By now, the becoming business-like of nonprofit organizations (NPOs) is a well-established global phenomenon that has received ever-growing attention from management and organization studies. However, the field remains hard to grasp in its entirety, as researchers use a multitude of similar, yet distinct, key concepts. The considerable range and complexity of these overlapping notions create major challenges: Scholars struggle to position their work in a larger context; it is not easy to build on previous findings and methodological developments; and research gaps are difficult to identify. The present article presents the first systematic literature review to confront those challenges by reviewing 599 relevant sources. In a first step, various key concepts are clarified. Second, the field is mapped according to three research foci: causes of NPOs becoming business-like, organizational structures and processes of becoming business-like, and effects of becoming business-like. From this, we draw conclusions and make suggestions for further research.