tPotato starch nanocrystals were found to serve as an effective reinforcing agent for natural rubber (NR).Starch nanocrystals were obtained by the sulfuric acid hydrolysis of potato starch granules. After mixingthe latex and the starch nanocrystals, the resulting aqueous suspension was cast into film by solventevaporation method. The composite samples were successfully prepared by varying filler loadings, usinga colloidal suspension of starch nanocrystals and NR latex. The morphology of the nanocomposite pre-pared was analyzed by field emission scanning electron microscopy (FESEM) and transmission electronmicroscopy (TEM). FESEM analysis revealed the size and shape of the crystal and their homogeneousdispersion in the composites. The crystallinity of the nanocomposites was studied using XRD analysiswhich indicated an overall increase in crystallinity with filler content. The mechanical properties of thenanocomposites such as stress–strain behavior, tensile strength, tensile modulus and elongation at breakwere measured according to ASTM standards. The tensile strength and modulus of the composites werefound to improve tremendously with increasing nanocrystal content. This dramatic increase observedcan be attributed to the formation of starch nanocrystal network. This network immobilizes the polymerchains leading to an increase in the modulus and other mechanical properties