In this study, hybrid polymer nanocomposites were fabricated using epoxy resin (EPR) incorporated with zirconium dioxide (ZrO₂) and yttrium oxide (Y₂O₃) nanoparticles (NPs), reinforced with multi-walled carbon nanotube (MWCNT) using hand lay-up casting technique. The mechanical, structural, and thermal stability of the hybrid nanocomposites were systematically investigated. The addition of a small amount of MWCNT is shown to improve the hybrid nanocomposites’ mechanical and thermal properties. For instance, the hybrid polymer nanocomposite containing 1 wt% NPs with the presence of 0.1 wt% of MWCNT show maximum tensile strength and Young’s modulus of 48.92 MPs and 2492.06 MPa, which increased by, respectively, 23 % and 37 % in comparison to pure EPR. Furthermore, adding nano-fillers to the hybrid composites caused a slight improvement in the glass transition temperature and thermal stability of the matrix. Consequently, the presence of the MWCNTs in the EPR nanocomposite matrix could make the product stronger as well as tougher. Overall, the improvement in mechanical properties with the stable thermal stability of the present hybrid nanocomposites indicates that it is a suitable candidate for structural and sub-structural construction.