Nanocomposites of natural rubber reinforced with SiC nanoparticles and single-walled carbon nanotubes were synthesized and processed using toluene as the solvent. It was found that the tensile strength of the nanocomposites was enhanced by incorporating both types of fillers, SiC nanoparticles and SWNTs, even at low 1.5% filler content. Both types of nanocomposites showed an increase in initial modulus with increasing filler content, with a maximum initial modulus at 1.5% filler content. Some variations of initial modulus were observed among the samples due to probable variation in filler content. The tangent modulus at 200% strain further confirms the enhancement of reinforcement by the nano-fillers at 1.5% content. The SiC nanoparticles/natural rubber was found to develop superior mechanical properties compared to the SWNT/natural rubber. Raman spectroscopic data suggest the existence of the interfacial adhesion between the SWNTs and natural rubber. Further studies are required to better understand interfacial structure and properties of the SiC nanoparticles and natural rubber.