This study analyzes how civic engagement and collaborative governance can be used to build peace in post-conflict societies. A case study approach is used to examine the presence of civic engagement as a precursor to collaborative governance in the reconstruction of segregated areas in post-conflict Ambon, Indonesia. The study evaluates the effective ways that people were engaged in the multiple processes of reconstruction and assesses the readiness of Ambon to apply collaborative governance in current affairs. It finds that collaborative governance can be applied to public policy processes in segregated societies in post-conflict and can promote inter-society engagement. This study suggests that governments and NGOs in post-conflict areas could use a collaborative governance approach to sustain peace in post-conflict areas. The conclusions recognize that integrating collaborative governance into peace building programs is a crucial element of the peace building process in post-conflict areas, creating a greater likelihood for sustainable peace.