 This study examined the use of cow dung ash, CDA, as a partial replacement for ordinary Portland cement, OPC, in mortar mixtures. The study found that CDA could be used as a substitute for OPC at a maximum level of 10%. However, this level was not sufficient to produce a mortar with similar physical and mechanical properties compared to OPC. At higher levels of CDA substitution, the mortar became less dense and had lower compressive strength. Additionally, the presence of unreacted particles and wide-stretched CSH gels were observed in the FTR analysis. This article was authored by Milook and Alba Choworku, Wibbished Zudu Tafees, the Hela Zirihan Hailamarium, and others.