Although museums for peace claim peace education to be a primary mission, their definitions of "peace" and their aims and practices for peace education vary widely. In this article, we draw from the field of critical museology and the knowledge construction perspective to understand the role of museums for peace in the service of peace education. From the constructivist viewpoint, the museums' narratives are not objective or historical truths. Rather they are the museum designers' "constructed" interpretations of the events, people, and places that are memorialized. The museums' exhibits, narratives, and programs reflect a wide range of definitions of peace including some which conflict and contradict each other. The variations in defining peace contribute to differences in how the museums view and exercise their role in educating for peace. From this analysis, we observe how contemporary museums for peace can play a significant role in peace education by raising awareness about multiple definitions of peace and by enabling audiences to reflect on, discuss and participate in deliberated paths toward personal peace and cultures of peace.