This work aims to investigate the effect of SiO 2 nanoparticles on the mechanical properties of pineapple leaf ber (PALF) epoxy hybrid composites. The compression molding process was used to create the composite. To achieve the aforementioned goals, the blends were made using 25% PALF and varied weight proportions (3wt%, 6wt%, and 9wt%) of SiO 2 nanoparticles. Tensile, bending, impact, interlaminar shear, shoreline D hardness, and dynamic mechanical analysis were all evaluated. SEM was used to examine the morphology of the materials, and an FTIR spectrometer was used to look for the presence of organic chemicals in ber-reinforced composite materials. The ndings show that adding 25% PALF ber and 6% SiO 2 nanoparticles (D-type) to the epoxy polymer improved the thermal and mechanical properties of the composites. It can be attributed to the improved interaction and homogeneous dispersion of the llers and epoxy polymers. Moreover, the water uptake parameters of all samples were studied. The ndings showed that the inclusion of reinforcements boosts the water uptake of the composite signi cantly. The initial deterioration rate of the SiO 2 -incorporated hybrids is almost the same, at about 400°C, which is considerably greater than that of the beginning breakdown temperatures of PALF (300°C), according to the thermography study. This might imply that the ber and polymers form a stronger bond, reducing polymer movement and increasing the thermostability of the combination.