Black soil is a widely available soil in many regions, which has high organic content, high plasticity and low strength. This study presents the stabilization of black soil with walnut shell ash (WSA) and lime. The aim of the study is to investigate the effects of the WSA and lime on the engineering properties of black soil. The WSA is used as a partial replacement of lime. The laboratory tests are conducted to determine the optimum proportions of WSA and lime for black soil stabilization. The tests include the Atterberg limits, compaction, unconfined compressive strength (UCS) and California bearing ratio (CBR). The results show that the addition of WSA and lime significantly improves the engineering properties of black soil. The maximum UCS and CBR values are obtained at 5% lime and 15% WSA content. The results suggest that WSA and lime can be effectively used to improve the engineering properties of black soil.