Municipal solid waste incineration ash presents a significant environmental challenge globally. In Vietnam, the utilization of ash from waste incineration remains limited, posing potential risks to both the environment and public health. This study aims to analyze the heavy metal content and assess the potential reuse of ash from municipal solid waste incinerators in agriculture. Through sampling and analysis methods, the nutrient composition, including N, P, K, along with heavy metal residues (As, Hg, Pb, Cd), were determined to evaluate its reuse potential. The results indicate that both ash and slag contain high nutrient levels, and the heavy metal content falls within safe limits for agricultural applications. The study proposes solutions for the sustainable reuse of ash, reducing reliance on chemical fertilizers and contributing to the circular economy through effective waste management.