Post-conflict reconstruction is essential for restoring peace, strengthening institutions, and promoting sustainable development in societies affected by violent conflict. This study comparatively examines the post-conflict reconstruction experiences of Rwanda and Sierra Leone, highlighting their recovery strategies and alignment with the United Nations Sustainable Development Goals (SDGs). Using a qualitative research design, the study draws on secondary data from government reports, international organizations, and scholarly literature to analyse governance reforms, peacebuilding initiatives, and economic recovery in both countries. The findings indicate that Rwanda adopted a comprehensive reconstruction model centred on national reconciliation, institutional reforms, the Gacaca Court system, and long-term development strategies such as Vision 2020 and Vision 2050, which facilitated social cohesion and economic transformation. Sierra Leone focused on peacebuilding through disarmament, demobilization and reintegration (DDR), governance reforms, and infrastructure rehabilitation with substantial international assistance. The study concludes that sustainable post-conflict recovery requires effective governance, inclusive institutions, community participation, and sustained international support. It offers valuable policy insights for countries seeking to achieve long-term peace, resilience, and sustainable development in post-conflict contexts.