Extraordinary properties of composite materials have made them center of extensive researches. By blending nanofluids with conventional reinforced materials, composites with superior properties are produced than ordinary composites. In this experimentally based study, it is focused on the improvement of nanocomposites using graphene particles in epoxy resin. Additionally, it is aimed to improve nanocomposites by using glass fiber and graphene reinforced epoxy resin. For this purpose, 0.4 mg/ mL and 0.8 mg/mL graphene oxide nanoparticles were added to the epoxy resin fluid and graphene oxide with same rates and glass fiber nanoparticles were added to the epoxy system. After the manufacturing process, longitudinal and transverse tensile, longitu dinal and transverse compression and three point bending tests were performed. By considering this twofold influence, the mechanical properties of graphene/epoxy resin were higher than epoxy resin. According to the obtained experimental data, it was found that the tensile and bending strengths of the graphene reinforced epoxy nanocomposites increased and the graphene improves the epoxy based composite’s mechanical properties.