The present investigation utilizes chicken eggshell (ES), a by-product of the poultry industry and a worldwide environmental problem, as a primary component. This study focuses on producing Al 1100 matrix composites reinforced with varying levels of ES (0 to 10 wt%, in 5 wt% increments). Al 1100 is used as the matrix material, with SiCp and carbonized coconut shell particles (CCNSp) as additional reinforcements. Composites were manufactured using a liquid stirring approach with a consistent 2% SiC reinforcement and varying amounts of carbonized coconut shell (0%, 2, and 4%) and eggshell (0%, 5%, and 10% wt%). The addition of ES particles enhances the compressive strength and stiffness of the composites, with the optimal results observed at 5 wt% ES combined with 2% SiC. Increasing the ES particle content improves the hardness of the composites, with the best results at 10 wt% ES. However, higher ES content also leads to brittle fracture and particle–matrix debonding, causing particle pullout. Consequently, pure Al 1100 exhibits the best impact quality.