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Polypropylene/styrene-butadiene-styrene (SBS) silica nanocomposites were mixed in a twin screw Brabender Plasticorder, the weight percent of the SBS was varied at (0, 5, 10, 20 and 40), and the silica content was varied at (0, 0.05, 0.1, 0.5, 1 and 2) wt%. The mechanical properties of these nanocomposites were studied using a Tensile Testing and Impact Testing machines. It was observed that increasing the SBS content lead to a drastic improvement in the impact strength, with over a 6-fold increase at maximum. Young's modulus decreased with increasing SBS content, with the highest decrease being approximately 35% at PP/SBS ratios of 60/40, excluding samples having this composition caused the highest decrease to drop to 25%. A proportional correlation was observed between the elongation at break and SBS content; on the other hand, an inversely proportional one was noticed between the yield stress and SBS content. The silica nanoparticles did not significantly enhance any of the mechanical properties. This is most likely due to the poor dispersion of these fumed silica nanoparticles in the Polypropylene/SBS matrix. Therefore, the SBS properties had a greater effect on the enhancement of the impact properties and the alteration of the tensile properties than the silica.