Abstarct: The aim of this study is increase the mechanical properties and to reduce the amount of wear by making polymeric composite materials using a combination of different nanostructures as a reinforcing agent. In this study, by adding nanotubes (CNTs), nanoclay (NC) and nano-graphene oxide (NGO) to the epoxy matrix, changes in the mechanical properties of the resulting material are investigated. For this purpose, pure epoxy, CNT/epoxy (1.5 wt. % of CNTs), NC/epoxy (1.5 wt. % of NCs), NGO/epoxy (1.5 wt. % of NGOs), CNT/NC/epoxy (0.75 wt. % of CNTs and 0.75 wt. % of NCs), CNT/NGO/epoxy (0.75 wt. % of CNTs and 0.75 wt. % of NGOs), NC/NGO/epoxy (0.75 wt. % of NCs and 0.75 wt. % of NGOs) and CNT/NC/NGO/epoxy (0.5 wt. % of CNTs, 0.5 wt. % of NCs and 0.5 wt. % of NGOs) nanocomposites are studied. To achieve uniformly dispersed nanoparticles within the epoxy matrix, the mechanical stirring with ultra-sonication is utilized. Young’s modulus, ultimate tensile strength, strain at break point, and fracture toughness of nanocomposite specimens are extracted from stress-strain curves. Also, dry wear test was performed using a pin on disc machine at different loads (60, 20 and 100 N) and the tribological performance of the used materials is discussed at room temperature. According to the results, adding 1.5 wt.% of CNTs into the epoxy matrix has the greatest effect on the mechanical properties of epoxy. In this case, the ultimate stress and strain at break point shows 16% and 27% increase with respect to those of epoxy sample, respectively. Also, the obtained results show that the combination of nanoclay with graphene nanoxide increases the toughness 42% compared to pure epoxy, which is the highest increase compared to other samples. Epoxy / nanotube and epoxy / nanoclay composites showed the highest abrasion resistance compared to other samples. CNT/epoxy wear rate decreases by 81% with respect to that of epoxy when load equals 60 N. further, when the load increases to 100 N, NC/epoxy wear rate decreases by 60% with respect to that of pure epoxy specimen. Surface morphology characterization is evaluated by Field emission scanning electron microscopy (FESEM).