The South Sudan intermittent conflicts and civil wars have attracted national, regional, and international interventions. Dominated by politically led conventional ideologies of peace approaches that revolve around suppression, negotiation, and mediation, such approaches have not achieved sustainable peace in the region. The case for societal customs presented here demonstrates a contrary view. Historically, the Nilotic Lwo ethnic groups of South Sudan, that is, Dinka and Nuer, have fought each other but utilised their customs in conflict resolution. The use of societal customs has prevailed at the grass-roots level in the face of intermittent interethnic conflicts, which feed into civil wars. This article explores the potential of societal customs in delivering sustainable peace even at a civil war level. It highlights a way of exploring further the themes (customary laws and practices) and of thinking about how/why/when these can be useful in meeting local’s interests, values, and perspectives in the civil war resolution.