<p>The incorporation of nanoparticles into hybrid carbon/glass composites significantly enhances their mechanical properties, making them suitable for various engineering applications. The primary aim of this study was to examine the effects of graphene nanoparticles (GNPs) on the mechanical and Charpy impact characteristics of carbon fiber/epoxy, glass fiber/epoxy, and their hybrid composite laminates across various laminate configurations. GNPs were uniformly dispersed in the epoxy matrix at different weight fractions of 0.1%, 0.25% and 0.5% (by weight). Experimental assessments encompassing flexural, tensile, and Charpy impact evaluations were carried out both with/without the incorporation of GNPs as reinforcing agents in the fabricated specimens. This research indicated that even a small addition of GNPs could lead to substantial improvements in tensile strength, flexural strength, and impact resistance due to better interfacial bonding between the fibers and the epoxy matrix. Upon introducing GNPs at a loading level of 0.1% (by weight), the experimental findings demonstrated a notable enhancement in the mechanical and impact properties of the hybrid composite laminates as a result of integrating GNPs into the epoxy matrix. This increase in strength can be attributed to the development of a strong interfacial bond among the fibers, epoxy, and GNPs leading to better load transferring from the matrix to the fibers.</p> Graphical abstract <p></p>