Abstract This study aims to investigate the synergistic effects of graphene, aluminum oxide (Al 2 O 3 ), and silicon oxide (SiO 2 ) nanofillers on the mechanical and thermal properties of epoxy composites. The objectives were to enhance the performance of epoxy resins by incorporating these nanofillers at varying weight fractions (0.5 %, 1 %, and 1.5 %) using ultrasonication for uniform dispersion. Standard ASTM tests, including tensile, flexural, and impact strength tests, along with thermal co