Integrating polypropylene fibre (PPF) and cow dung ash (CDA) into concrete presents a promising avenue for sustainable building materials. Cow dung ash contributes to environmental sustainability by reducing carbon emissions and pollution, while PPF enhances fracture resistance, mechanical strength, and durability against water infiltration and chemical attacks. This study investigates the combined use of PPF and CDA as additives in concrete, focusing on optimizing their mix ratio to enhance compressive strength. Concrete mixes were prepared using Grade 43 ordinary Portland cement, river sand as fine aggregate, and coarse aggregate, with varying proportions of CDA and PPF. Compressive strength testing was conducted for 3 days, 14 days, and 28 days after casting. The results indicate that a mix containing 1.0% PPF and 10% CDA yielded the highest compressive strength across all testing durations, with specific values of 20.5 MPa at 3 days, 28.7 MPa at 14 days, and 35.2 MPa at 28 days, surpassing other combinations. This study provides valuable insights into the use of CDA and PPF as sustainable construction materials, demonstrating their potential to improve concrete performance and promote environmentally friendly building practices.