With the rise of populist leaders around the world, populism's impact on foreign policy and international affairs has come into focus. Adding to this literature, we propose the concept of ‘populist peacemaking’, in which key tenets of populism, in style and substance, are projected onto the sphere of international mediation. We offer an analytical framework for understanding populist peacemaking consisting of three features. Firstly, populist peacemaking is characterized by a rejection of the ‘peacemaking elites’ and their established rules and practices, including international norms, a refutation of context-specific knowledge, and a clean-slate approach that disregards past peacemaking attempts and alienates other international mediators. Secondly, populist peacemaking employs aggrandized rhetoric and symbolism that puts the mediator—rather than the conflict parties—in the spotlight, thus integrating domestic politics into peacemaking. Finally, populist peacemaking frames the process as representing the volonté générale, i.e. serving the interests of the ‘pure people’ in the conflict-affected context. We illustrate this phenomenon empirically with a case-study of United States' peacemaking efforts during the Trump era, tracing initiatives pursued by US envoys in the Israeli–Palestinian and Kosovo–Serbia conflicts. From this analysis, populist peacemaking emerges as a distinct phenomenon, not to be subsumed under the heading of ‘illiberal peacemaking’.