There is growing recognition that business activity can promote peacebuilding, yet contradictory claims have emerged about company roles in peace and conflict. The research field of business and peace has focused on this issue, as have scholars in related fields like political science, economics, law, and ethics. This has led to definitional variations, alongside unit and level of analysis differences, which generate contradictory claims that hamper future research on this critical topic. To reconcile extant research around companies and their place in peacebuilding scholarship, we undertake an organizational‐level examination of the field, cataloguing the research by scholars across disciplines through a systematic review of 215 publications. Our review maps the known ways by which businesses can engage in peacebuilding, while demonstrating how organizations exercise their agency to create heterogenous effects on peace and conflict. Our analysis highlights the need for businesses to advance peace‐positive ends across a range of activities to reduce the conflict‐causing effects of business. By showing that businesses, intentionally or not, create peace or conflict through their activities, this article issues a call to action for scholars and decision‐makers to advance knowledge concerning peacebuilding organizations.