Cultural diplomacy has emerged as an important yet underexplored instrument for promoting peace and mutual understanding across African societies affected by recurrent conflict and identity-based tensions. This paper evaluated the impact of cultural exchange and arts-based initiatives in strengthening peacebuilding processes in Nigeria, Mali, and South Africa. It was a comparative study drawn on documented case studies, policy reports, and existing scholarly research to explore how culture and creative expression have contributed to reconciliation, dialogue, and social cohesion in post-conflict and divided communities. The paper adopted a comparative approach using secondary source of data, guided by Soft Power Theory and Peacebuilding Theory, to assess how cultural activities from film and music to heritage preservation serve as non-coercive tools for regional stability and conflict prevention. Findings highlight that, while cultural diplomacy fosters cross-cultural understanding and provides an inclusive platform for peace dialogue, its potential remains constrained by weak institutional frameworks, limited funding, and lack of strategic coordination among African states. The paper concluded that embedding cultural diplomacy within national and regional peacebuilding agendas is essential to consolidate sustainable peace on the continent. And therefore recommended among others that ministries of culture, foreign affairs, and interior should collaborate to integrate cultural initiatives into national peace and security policies.